WorldWideScience

Sample records for carbon steel piping

  1. 75 FR 32911 - Preliminary Results of Antidumping Duty Administrative Review: Circular Welded Carbon Steel Pipes...

    Science.gov (United States)

    2010-06-10

    ... Welded Carbon Steel Pipes and Tubes From Taiwan AGENCY: Import Administration, International Trade... administrative review of the antidumping duty order on circular welded carbon steel pipes and tubes from Taiwan... circular welded carbon steel pipes and tubes from Taiwan. See Certain Circular Welded Carbon Steel...

  2. 76 FR 33210 - Preliminary Results of Antidumping Duty Administrative Review: Circular Welded Carbon Steel Pipes...

    Science.gov (United States)

    2011-06-08

    ... Welded Carbon Steel Pipes and Tubes From Taiwan AGENCY: Import Administration, International Trade... administrative review of the antidumping duty order on circular welded carbon steel pipes and tubes from Taiwan... circular welded carbon steel pipes and tubes from Taiwan. See Certain Circular Welded Carbon Steel...

  3. 78 FR 34340 - Welded Carbon Steel Standard Pipe and Tube Products From Turkey: Preliminary Results of...

    Science.gov (United States)

    2013-06-07

    ... Order; Welded Carbon Steel Standard Pipe and Tube Products from Turkey, 51 FR 17784 (May 15, 1986). The... International Trade Administration Welded Carbon Steel Standard Pipe and Tube Products From Turkey: Preliminary... antidumping duty order on welded carbon steel standard pipe and tube products (welded pipe and tube)...

  4. 75 FR 16439 - Certain Welded Carbon Steel Standard Pipe From Turkey: Preliminary Results of Countervailing Duty...

    Science.gov (United States)

    2010-04-01

    ... Steel Pipe and Tube Products from Turkey, 51 FR 7984 (March 7, 1986). On March 2, 2009, the Department... Administrative Review: Certain Welded Carbon Steel Standard Pipe from Turkey, 72 FR 62837, 62838 (November 7...: Certain Welded Carbon Steel Standard Pipe from Turkey, 73 FR 12080 (March 6, 2008). To calculate the...

  5. Effect of heat treatment on carbon steel pipe welds

    International Nuclear Information System (INIS)

    The heat treatment to improve the altered properties of carbon steel pipe welds is described. Pipe critical components in oil, gasification and nuclear reactor plants require adequate room temperature toughness and high strength at both room and moderately elevated temperatures. Microstructure and microhardness across the welds were changed markedly by the welding process and heat treatment. The presentation of hardness fluctuation in the welds can produce premature failure. A number of heat treatments are suggested to improve the properties of the welds. (author) 8 figs., 5 refs

  6. 77 FR 64471 - Circular Welded Carbon-Quality Steel Pipe From the Socialist Republic of Vietnam: Final Negative...

    Science.gov (United States)

    2012-10-22

    ... International Trade Administration Circular Welded Carbon-Quality Steel Pipe From the Socialist Republic of... welded carbon-quality steel pipe (``circular welded pipe'') from the Socialist Republic of Vietnam... Preliminary Determination.\\1\\ \\1\\ See Circular Welded Carbon-Quality Steel Pipe from the Socialist Republic...

  7. Fatigue crack growth rate studies on pipes and pipe welds made of austenitic stainless steel and carbon steel

    International Nuclear Information System (INIS)

    The objective of the present study is to understand the fatigue crack growth behavior in austenitic stainless steel and carbon steel pipes and pipe welds by carrying out analysis/predictions and experiments. The Paris law has been used for the prediction of fatigue crack growth life. To carry out the analysis, Paris constants have been determined for pipe (base) and pipe weld materials by using Compact Tension (CT)/Three Point Bend (TPB) specimens machined from the actual pipe/pipe weld. Analyses have been carried out to predict the fatigue crack growth life of pipes/pipe welds having part through cracks on the outer surface. In the analyses, Stress Intensity Factors (K) have been evaluated through two different schemes. The first scheme considers the 'K' evaluations at two points of the crack front i.e. maximum crack depth and crack tip at the outer surface. The second scheme accounts for the area averaged root mean square stress intensity factor (KRMS) at deepest and surface points. In order to validate the analytical procedure/results, experiments have been carried out on full scale pipe and pipe welds with part through circumferential crack. Fatigue crack growth life evaluated using both schemes have been compared with experimental results. Use of stress intensity factor (KRMS) evaluated using second scheme gives better fatigue crack growth life prediction compared to that of first scheme. (author)

  8. Acceptance criteria for corroded carbon steel piping containing weld defects

    International Nuclear Information System (INIS)

    Acceptance criteria for corroded low temperature, low pressure carbon steel piping containing weld defects is presented along with a typical application of these criteria. They are intended to preclude gross rupture or rapidly propagating failure due to uniform wall thinning, local wall thinning, pitting corrosion and weld defects. The minimum allowable uniform wail thickness is based on the code-of-record allowable stress and fracture criteria. Weld defects are postulated as potential sites for fracture initiation. CEGB/R6 failure assessment diagram is used as the fracture criteria to determine the minimum allowable wall thickness. Design of a large portion of the low temperature, low pressure piping is dominated by axial stresses. Existing local wall thinning acceptance criteria address high pressure piping where hoop stress dominates the design. The existing criteria is over conservative, in some cases, when used on low pressure piping. Local wall thinning criteria is developed to limit the axial stress on the locally thinned section, based on a reduced average thickness. Limits on pit density are also developed to provide acceptance criteria for pitted piping

  9. 75 FR 69125 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China

    Science.gov (United States)

    2010-11-10

    ..., and by publishing the notice in the Federal Register on May 11, 2010 (75 FR 26273). The hearing was... COMMISSION Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China Determination... alloy steel standard, line, and pressure pipe (``seamless SLP pipe''), provided for in subheadings...

  10. 75 FR 26273 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China

    Science.gov (United States)

    2010-05-11

    ... COMMISSION Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China AGENCY... pipe (``seamless SLP pipe''), provided for in subheadings 7301.19.10, 7304.19.50, 7304.31.60, 7304.39... China of seamless SLP pipe, and that such products are being sold in the United States at less than...

  11. 77 FR 65712 - Circular Welded Carbon-Quality Steel Pipe From Vietnam; Termination of Investigation

    Science.gov (United States)

    2012-10-30

    ... COMMISSION Circular Welded Carbon-Quality Steel Pipe From Vietnam; Termination of Investigation AGENCY... subsidies in connection with the subject investigation (77 FR 64471). Accordingly, pursuant to section 207... investigation concerning circular welded carbon-quality steel pipe from Vietnam (investigation No....

  12. 75 FR 44766 - Certain Welded Carbon Steel Standard Pipe from Turkey: Final Results of Countervailing Duty...

    Science.gov (United States)

    2010-07-29

    ...: Certain Welded Carbon Steel Pipe and Tube Products From Turkey, 51 FR 7984 (March 7, 1986). On April 1...: Preliminary Results of Countervailing Duty Administrative Review, 75 FR 16439 (April 1, 2010) (Preliminary...) was rescinded. See Welded Carbon Steel Standard Pipe and Tube from Turkey: Notice of Rescission...

  13. 77 FR 19623 - Certain Welded Carbon Steel Standard Pipe from Turkey: Preliminary Results of Countervailing Duty...

    Science.gov (United States)

    2012-04-02

    ... Pipe and Tube Products from Turkey, 51 FR 7984 (March 7, 1986). \\2\\ See Antidumping or Countervailing... Administrative Review, in Part, 76 FR 78886 (December 20, 2011). \\12\\ See Certain Welded Carbon Steel Standare...: Certain Welded Carbon Steel Standard Pipe from Turkey, 72 FR 62837, 62838 (November 7, 2007) (Turkey...

  14. 78 FR 49255 - Certain Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Partial Rescission of...

    Science.gov (United States)

    2013-08-13

    ... Request for Revocation in Part, 78 FR 38924 (June 28, 2013). On July 25, 2013, Petitioner withdrew its... International Trade Administration Certain Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Partial... certain circular welded carbon steel pipes and tubes from Taiwan. The period of review (POR) is May...

  15. 75 FR 22372 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's...

    Science.gov (United States)

    2010-04-28

    ... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe... determines that certain seamless carbon and alloy steel standard, line, and pressure pipe from the People's... imports of certain seamless carbon and alloy steel standard, line, and pressure pipe (``seamless...

  16. 75 FR 69050 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's...

    Science.gov (United States)

    2010-11-10

    ... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe... duty order on certain seamless carbon and alloy steel standard, line, and pressure pipe (``seamless... seamless pipe from the PRC. See Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure...

  17. 78 FR 33108 - Circular Welded Carbon-Quality Steel Pipe From China; Institution of Five-Year Reviews

    Science.gov (United States)

    2013-06-03

    ... countervailing duty orders on imports of circular welded carbon-quality steel pipe from China (73 FR 42545-42549... COMMISSION Circular Welded Carbon-Quality Steel Pipe From China; Institution of Five-Year Reviews AGENCY... welded carbon-quality steel pipe from China would be likely to lead to continuation or recurrence...

  18. 77 FR 73674 - Circular Welded Carbon-Quality Steel Pipe From India, Oman, The United Arab Emirates, and Vietnam

    Science.gov (United States)

    2012-12-11

    ... countervailing duty determination with respect to circular welded carbon-quality steel pipe from Vietnam (77 FR... COMMISSION Circular Welded Carbon-Quality Steel Pipe From India, Oman, The United Arab Emirates, and Vietnam... determinations by Commerce that imports of circular welded carbon- quality steel pipe from India, Oman,...

  19. 78 FR 72863 - Circular Welded Carbon-Quality Steel Pipe From the People's Republic of China: Continuation of...

    Science.gov (United States)

    2013-12-04

    ...). \\3\\ See Circular Welded Carbon-Quality Steel Pipe From China, 78 FR 70069 (November 22, 2013). Scope... Carbon Quality Steel Pipe From the People's Republic of China, 73 FR 42547 (July 22, 2008). Continuation... International Trade Administration Circular Welded Carbon-Quality Steel Pipe From the People's Republic of...

  20. 78 FR 72863 - Circular Welded Carbon Quality Steel Pipe From the People's Republic of China: Continuation of...

    Science.gov (United States)

    2013-12-04

    ...'') Review, 78 FR 33063 (June 3, 2013). \\2\\ See Circular Welded Carbon Quality Steel Pipe From the People's... FR 60849 (October 2, 2013). \\3\\ See Circular Welded Carbon-Quality Steel Pipe from China, 78 FR 70069... International Trade Administration Circular Welded Carbon Quality Steel Pipe From the People's Republic of...

  1. 77 FR 64478 - Circular Welded Carbon-Quality Steel Pipe From India: Final Determination of Sales at Less Than...

    Science.gov (United States)

    2012-10-22

    ... Preliminary Determination, 77 FR at 32562-63. \\3\\ See Circular Welded Carbon-Quality Steel Pipe From India...; Certain Welded Carbon Steel Standard Pipes and Tubes From India, 51 FR 17384 (May 12, 1986). Therefore... International Trade Administration Circular Welded Carbon-Quality Steel Pipe From India: Final Determination...

  2. 78 FR 72114 - Circular Welded Carbon Quality Steel Line Pipe From China; Institution of Five-Year Reviews

    Science.gov (United States)

    2013-12-02

    ... circular welded carbon quality steel line pipe from China (74 FR 4136). On May 13, 2009, the Department of... COMMISSION Circular Welded Carbon Quality Steel Line Pipe From China; Institution of Five-Year Reviews AGENCY... welded carbon quality steel line pipe from China would be likely to lead to continuation or recurrence...

  3. 76 FR 64900 - Welded Carbon Steel Pipe and Tube From Turkey: Final Results of Expedited Sunset Review of...

    Science.gov (United States)

    2011-10-19

    ... International Trade Administration Welded Carbon Steel Pipe and Tube From Turkey: Final Results of Expedited...) initiated a sunset review of the countervailing duty order (CVD) on welded carbon steel pipe and tube from... CVD order on welded carbon steel pipe and tube from Turkey was published in the Federal Register...

  4. 76 FR 33204 - Certain Welded Carbon Steel Pipe and Tube From Turkey; Notice of Preliminary Results of...

    Science.gov (United States)

    2011-06-08

    ... Order; Welded Carbon Steel Standard Pipe and Tube Products From Turkey, 51 FR 17784 (May 15, 1986... Carbon Steel Pipe and Tube from Turkey, 71 FR 26043 (May 3, 2006), unchanged in Notice of Final Results of Antidumping Duty New Shipper Review: Certain Welded Carbon Steel Pipe and Tube From Turkey, 71...

  5. 76 FR 76939 - Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of Final Results of Antidumping...

    Science.gov (United States)

    2011-12-09

    ... International Trade Administration Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of Final... welded carbon steel pipe and tube from Turkey. The administrative review covers the Borusan Group \\1\\ and... preliminary results of the antidumping duty administrative view of certain welded carbon steel pipe and...

  6. 78 FR 79665 - Welded Carbon Steel Standard Pipe and Tube Products From Turkey: Final Results of Antidumping...

    Science.gov (United States)

    2013-12-31

    ... Antidumping Duty Order; Welded Carbon Steel Standard Pipe and Tube Products From Turkey, 51 FR 17784, 17784... International Trade Administration Welded Carbon Steel Standard Pipe and Tube Products From Turkey: Final... administrative review of the antidumping duty order on welded carbon steel standard pipe and tube...

  7. 77 FR 64468 - Circular Welded Carbon-Quality Steel Pipe From India: Final Affirmative Countervailing Duty...

    Science.gov (United States)

    2012-10-22

    ...; Countervailing Duties, 62 FR 27296, 27323 (May 19, 1997), and Circular Welded Carbon-Quality Steel Pipe From... Countervailing Duty Determination: Certain Hot-Rolled Carbon Steel Flat Products From Argentina, 66 FR 37007... Concrete Steel Wire Strand From India, 68 FR 68356 (December 8, 2003). We determine the...

  8. 77 FR 54926 - Certain Seamless Carbon and Alloy Steel; Standard, Line, and Pressure Pipe From Germany

    Science.gov (United States)

    2012-09-06

    ... FR 19711) and determined on July 6, 2012, that it would conduct an expedited review (77 FR 42763... COMMISSION Certain Seamless Carbon and Alloy Steel; Standard, Line, and Pressure Pipe From Germany... steel standard, line, and pressure pipe from Germany would be likely to lead to continuation...

  9. 78 FR 34335 - Certain Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Preliminary Results of...

    Science.gov (United States)

    2013-06-07

    ... of Antidumping Duties, 68 FR 23954 (May 6, 2003). Cash Deposit Requirements The following cash... Steel Pipes and Tubes From Taiwan: Antidumping Duty Order, 49 FR 19369 (May 7, 1984). These cash deposit... International Trade Administration Certain Circular Welded Carbon Steel Pipes and Tubes From Taiwan:...

  10. 75 FR 36635 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Rescission of Antidumping Duty...

    Science.gov (United States)

    2010-06-28

    ... FR 9162 (March 1, 2010). On March 31, 2010, we received a timely request from Saha Thai Steel Pipe... Revocation in Part, 75 FR 22107 (April 27, 2010). Rescission of Antidumping Duty Administrative Review The... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Thailand: Rescission...

  11. 75 FR 2487 - Circular Welded Carbon Steel Pipes and Tubes from Thailand: Court Decision Not in Harmony with...

    Science.gov (United States)

    2010-01-15

    ... Steel Pipes and Tubes from Thailand: Final Results of Antidumping Duty Administrative Review, 73 FR... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes from Thailand: Court Decision... results of the administrative review of the antidumping order on circular welded carbon steel pipes...

  12. 75 FR 60814 - Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand

    Science.gov (United States)

    2010-10-01

    ... Investigation No. F.R. cite 12/17/86 Carbon steel butt- 731-TA-308 51 FR 45152. weld pipe fittings/ Brazil. 12/17/86 Carbon steel butt- 731-TA-310 51 FR 45152. weld pipe fittings/ Taiwan. 2/10/87 Carbon steel butt- 731-TA-309 52 FR 4167. weld pipe fittings/ Japan. 7/6/92 Carbon steel butt- 731-TA-520 57...

  13. 75 FR 18788 - Circular Welded Carbon Steel Pipes and Tubes from Thailand: Preliminary Results and Rescission...

    Science.gov (United States)

    2010-04-13

    ...: Circular Welded Carbon Steel Pipes and Tubes from Thailand, 51 FR 8341 (March 11, 1986). On March 2, 2009... Shipper Review Final Results, 75 FR at 4529-4530 (January 28, 2010). Allied Tube responded to Pacific Pipe... Review, 73 FR 61019 (October 15, 2008) (2006-2007 AR Final Results); see Circular Welded Carbon...

  14. 76 FR 66893 - Certain Circular Welded Carbon Steel Pipes and Tubes From India, Thailand, and Turkey; Final...

    Science.gov (United States)

    2011-10-28

    ..., 75 FR 69626, 69627 (November 15, 2010). Thailand--Welded Carbon Steel Pipe and Tube (A-549-502) The.... See Scope Rulings, 58 FR 27542, (May 10, 1993). Turkey--Welded Carbon Steel Pipe and Tube (A-489-501... Tubes from India, 51 FR 17384 (May 12, 1986); Antidumping Duty Order; Circular Welded Carbon Steel...

  15. 77 FR 56809 - Certain Small Diameter Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From...

    Science.gov (United States)

    2012-09-14

    ..., seamless pipes are seamless carbon and alloy (other than stainless) steel pipes, of circular cross-section... produced in non- standard wall thicknesses are commonly referred to as tubes. The seamless pipes subject to.... Seamless line pipes are produced to the API 5L specification. Seamless pipes are commonly produced...

  16. 77 FR 20782 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Preliminary Results of Antidumping...

    Science.gov (United States)

    2012-04-06

    ... investigation. See Antidumping Duty Order: Circular Welded Carbon Steel Pipes and Tubes From Thailand, 51 FR... Pipes and Tubes from Thailand, 51 FR 8341 (March 11, 1986). On March 1, 2011, the Department published a... Duty Order, Finding, or Suspended Investigation; Opportunity to Request Administrative Review, 76...

  17. The effect of cyclic and dynamic loads on carbon steel pipe

    International Nuclear Information System (INIS)

    This report presents the results of four 152-mm (6-inch) diameter, unpressurized, circumferential through-wall-cracked, dynamic pipe experiments fabricated from STS410 carbon steel pipe manufactured in Japan. For three of these experiments, the through-wall crack was in the base metal. The displacement histories applied to these experiments were a quasi-static monotonic, dynamic monotonic, and dynamic, cyclic (R = -1) history. The through-wall crack for the third experiment was in a tungsten-inert-gas weld, fabricated in Japan, joining two lengths of STS410 pipe. The displacement history for this experiment was the same history applied to the dynamic, cyclic base metal experiment. The test temperature for each experiment was 300 C (572 F). The objective of these experiments was to compare a Japanese carbon steel pipe material with US pipe material, to ascertain whether this Japanese steel was as sensitive to dynamic and cyclic effects as US carbon steel pipe. In support of these pipe experiments, quasi-static and dynamic, tensile and fracture toughness tests were conducted. An analysis effort was performed that involved comparing experimental crack initiation and maximum moments with predictions based on available fracture prediction models, and calculating J-R curves for the pipe experiments using the η-factor method

  18. Ductile fracture behavior of 3-inch diameter carbon steel piping with a circumferential through-wall crack under bending load

    International Nuclear Information System (INIS)

    In order to introduce Leak-Before-Break (LBB) concept into the piping design criteria of the LWR pressure boundary pipings, it is necessary to investigate the pipe fracture behaviors, such as fracture condition and crack opening area, etc. At JAERI, pipe fracture tests of stainless steel and STS42 carbon steel pipes under bending load have been conducted as a part of the LBB research program. This report summarizes the four-point bending test results of 3-inch diameter STS42 carbon steel pipe with a circumferential through-wall crack. Tests were carried out at room temperature. In the tests, the fracture behavior of pipes was investigated to evolute the validity of Net-section collapse criterion, J-R curve and crack opening area. It is shown that the Net-section collapse criterion gives a conservative evaluation for the fracture load of 3-inch diameter carbon steel pipes. (author)

  19. 75 FR 69052 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's...

    Science.gov (United States)

    2010-11-10

    ... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe..., and pressure pipe (``seamless pipe'') from the People's Republic of China (``PRC''). In addition, the... value in the antidumping duty investigation of seamless pipe from the PRC. See Certain Seamless...

  20. 75 FR 13255 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-03-19

    ... Pressure Pipe From the People's Republic of China: Initiation of Antidumping Duty Investigation, 74 FR... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe..., line, and pressure pipe (``seamless pipe'') from the People's Republic of China (``PRC'') with...

  1. 77 FR 21968 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2012-04-12

    ... International Trade Administration Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the... countervailing duty order on seamless carbon and alloy steel standard, line, and pressure pipe from the People's... Antidumping and Countervailing Duty Administrative Reviews and Request for Revocation in Part, 76 FR...

  2. 75 FR 29972 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-05-28

    ... Determination, 75 FR 22372 (April 28, 2010) (``Preliminary Determination''). On May 3, 2010, Tianjin Pipe (Group... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe... antidumping duty investigation of certain seamless carbon and alloy steel standard, line, and pressure...

  3. 75 FR 6183 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-02-08

    ... investigation on certain seamless carbon and alloy steel standard, line, and pressure pipe from the People's Republic of China. See Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of China: Initiation of Antidumping Duty Investigation, 74 FR 52744 (October 14,...

  4. 75 FR 57449 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-09-21

    ... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe... determined that certain seamless carbon and alloy steel standard, line, and pressure pipe from the People's..., in Part, and Postponement of Final Determination, 75 FR 22372 (April 28, 2010)...

  5. 76 FR 7151 - Certain Carbon Steel Butt-Weld Pipe Fittings From Brazil, Japan, Taiwan, Thailand, and the People...

    Science.gov (United States)

    2011-02-09

    ... Order; Certain Carbon Steel Butt-Weld Pipe Fittings from Brazil, 51 FR 45152 (December 17, 1986... Fair Value; Certain Carbon Steel Butt-Weld Pipe Fittings From the People's Republic of China, 57 FR... of 1930, as amended (the Act). See Initiation of Five-Year (``Sunset'') Review, 75 FR 60731...

  6. 75 FR 81968 - Circular Welded Carbon Quality Steel Pipe From the People's Republic of China: Rescission of...

    Science.gov (United States)

    2010-12-29

    ... International Trade Administration Circular Welded Carbon Quality Steel Pipe From the People's Republic of China... circular welded carbon quality steel pipe (``CWP'') from the People's Republic of China (``PRC''). This... Order, Finding, or Suspended Investigation; Opportunity To Request Administrative Review, 75 FR...

  7. 77 FR 36256 - Circular Welded Carbon-Quality Steel Pipe From India: Postponement of Final Determination of...

    Science.gov (United States)

    2012-06-18

    ... International Trade Administration Circular Welded Carbon-Quality Steel Pipe From India: Postponement of Final... investigation on circular welded carbon- quality steel pipe from India.\\1\\ On June 1, 2012, the Department... Vietnam: Initiation of Antidumping Duty Investigations, 76 FR 72164 (November 22, 2011). \\2\\ See...

  8. 76 FR 57020 - Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Notice of Partial Rescission of...

    Science.gov (United States)

    2011-09-15

    ... Antidumping and Countervailing Duty Administrative Reviews and Request for Revocation in Part, 76 FR 37781... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Notice of Partial... welded carbon steel pipes and tubes from Taiwan. The review covers eight firms. Based on a withdrawal...

  9. 75 FR 3896 - Certain Welded Carbon Steel Pipe and Tube from Turkey: Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2010-01-25

    ... International Trade Administration Certain Welded Carbon Steel Pipe and Tube from Turkey: Extension of Time... and Countervailing Duty Administrative Reviews and Request for Revocation in Part, 74 FR 30052 (June... initiation of the administrative review of the antidumping duty order on certain welded carbon steel pipe...

  10. 76 FR 71938 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Extension of Time Limit for...

    Science.gov (United States)

    2011-11-21

    ... Administrative Reviews, 76 FR 23545, 23546 (April 27, 2011). This review covers two producers/exporters of the... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Thailand: Extension of Time... the antidumping duty order on circular welded carbon steel pipes and tubes from Thailand for...

  11. 77 FR 41967 - Certain Circular Welded Carbon Steel Pipes and Tubes From India, Thailand, and Turkey; Certain...

    Science.gov (United States)

    2012-07-17

    ... Review, 75 FR 69626, 69627 (November 15, 2010). Thailand--Welded Carbon Steel Pipe and Tube (A-549-502... remand. See Scope Rulings, 58 FR 27542 (May 10, 1993). Turkey--Welded Carbon Steel Pipe and Tube (A-489... Initiation of Five-Year (``Sunset'') Review, 76 FR 38613 (July 1, 2011). \\2\\ See Certain Circular...

  12. 77 FR 32562 - Circular Welded Carbon-Quality Steel Pipe From India: Preliminary Determination of Sales at Less...

    Science.gov (United States)

    2012-06-01

    ... FR at 72164-5. On December 9, 2011, we received comments from a UAE producer named Universal Tube and...: Circular Welded Carbon Quality Steel Pipe from the People's Republic of China, 73 FR 31970 (June 5, 2008... Duty Order; Certain Welded Carbon Steel Standard Pipes and Tubes from India, 51 FR 17384 (May 12,...

  13. 77 FR 2511 - Certain Welded Carbon Steel Pipe and Tube From Turkey: Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2012-01-18

    ... International Trade Administration Certain Welded Carbon Steel Pipe and Tube From Turkey: Extension of Time... administrative review of the antidumping duty order on certain welded carbon steel pipe and tube from Turkey... Duty Administrative Reviews and Request for Revocation in Part, 76 FR 37781 (June 28, 2011)....

  14. 76 FR 3083 - Certain Welded Carbon Steel Pipe and Tube From Turkey: Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2011-01-19

    ... International Trade Administration Certain Welded Carbon Steel Pipe and Tube From Turkey: Extension of Time... administrative review of the antidumping duty order on certain welded carbon steel pipe and tube from Turkey... Duty Administrative Reviews and Requests for Revocation in Part, 75 FR 37759 (June 30, 2010)....

  15. 77 FR 32508 - Circular Welded Carbon Steel Pipes and Tubes From Turkey: Notice of Preliminary Results of...

    Science.gov (United States)

    2012-06-01

    ... Order; Welded Carbon Steel Standard Pipe and Tube Products From Turkey, 51 FR 17784 (May 15, 1986..., 76 FR 33204, 33208 (June 8, 2011), unchanged in Certain Welded Carbon Steel Pipe and Tube From Turkey... Tube from Turkey; Notice of Preliminary Results of Antidumping Duty Administrative Review, 76 FR...

  16. 76 FR 78313 - Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam

    Science.gov (United States)

    2011-12-16

    ... COMMISSION Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam... United Arab Emirates, and Vietnam of circular welded carbon- quality steel pipe, provided for in... October 26, 2011, a petition was filed with the Commission and Commerce by Allied Tube and Conduit,...

  17. 76 FR 63902 - Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Final Results of Antidumping Duty...

    Science.gov (United States)

    2011-10-14

    ... Welded Carbon Steel Pipes and Tubes From Taiwan, 76 FR 33210 (June 8, 2011) (Preliminary Results). This... Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Antidumping Duty Order, 49 FR 19369 (May 7, 1984... section 773(b) of the Tariff Act of 1930, as amended (the Act). See Preliminary Results, 76 FR at...

  18. 77 FR 6542 - Certain Welded Carbon Steel Standard Pipe and Tube From Turkey: Notice of Final Rescission of...

    Science.gov (United States)

    2012-02-08

    ... International Trade Administration Certain Welded Carbon Steel Standard Pipe and Tube From Turkey: Notice of... of the countervailing duty (CVD) order on certain welded carbon steel pipe and tube from Turkey for... FR 11197 (March 1, 2011). On March 30, 2011, we received a letter from Erbosan Erciyas Boru Sanayi...

  19. 77 FR 55807 - Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Notice of Partial Rescission of...

    Science.gov (United States)

    2012-09-11

    ... Reviews and Request for Revocation in Part, 77 FR 40565 (July 10, 2012). On August 15, 2012, the... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Notice of Partial... welded carbon steel pipes and tubes from Taiwan. The review covers four respondents. Based on...

  20. 76 FR 78886 - Certain Welded Carbon Steel Standard Pipe and Tube From Turkey: Intent To Rescind Countervailing...

    Science.gov (United States)

    2011-12-20

    ... International Trade Administration Certain Welded Carbon Steel Standard Pipe and Tube From Turkey: Intent To... the countervailing duty (CVD) order on certain welded carbon steel pipe and tube from Turkey. See... Administrative Review, 76 FR 11197 (March 1, 2011). On March 30, 2011, we received a letter from Erbosan...

  1. 75 FR 68327 - Certain Welded Carbon Steel Standard Pipes and Tubes From India: Rescission of Antidumping Duty...

    Science.gov (United States)

    2010-11-05

    ... and Requests for Revocation in Part, 75 FR 37759 (June 30, 2010). Based on various requests for review... International Trade Administration Certain Welded Carbon Steel Standard Pipes and Tubes From India: Rescission... certain welded carbon steel standard pipes and tubes from India. The period of review is May 1,...

  2. 75 FR 33262 - Certain Welded Carbon Steel Pipe and Tube from Turkey: Notice of Preliminary Results of...

    Science.gov (United States)

    2010-06-11

    ... and Tube From Turkey, 74 FR 6368 (February 9, 2009), unchanged in Certain Welded Carbon Steel Pipe and Tube from Turkey: Notice of Final Results of Antidumping Duty Administrative Review, 74 FR 22883 (May... International Trade Administration Certain Welded Carbon Steel Pipe and Tube from Turkey: Notice of...

  3. Effect of Cr content, hardness and micro structure on flow-accelerated corrosion in carbon steel pipes. Examination of replaced carbon steel pipes

    International Nuclear Information System (INIS)

    68 replaced carbon steel piping in secondary system of pressurized water reactor (PWR) has been investigated by visual examination for checking thinning conditions. It is well known that the flow-accelerated corrosion (FAC) was inhibited by traces of Cr in steel. Therefore, the chemical compositions of those steels have been measured. In addition, the micro structure and hardness of those steels have been investigated. And the relationship between those material variables and FAC rate was considered. As the results, (1) The Cr contents in those steels were below 0.1 wt% except one sample. Minute quantities of chromium increase the resistance against FAC. But the water velocity was thought to be the dominant factor rather than chemical composition in steel, at least such as below 0.1%Cr. (2) Hardness of all piping has been satisfied the specifications of each materials. The hardness of steels was not correlated with wall thinning rate. (3) The micro structure was also not correlated with FAC rate. (author)

  4. Localized Corrosion of Zn-Plated Carbon Steel Used as a Fire Sprinkler Pipe

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jin Hee [SK Engineering and Construction Corp., Seoul (Korea, Republic of); Lee, You Kee [Ui duk University, Gyeongju (Korea, Republic of); Lee, Kyu Hwan [Korea Institute of Materials Science, Changwon (Korea, Republic of); Kim, Dong Kyu; Lee, Sung Gun; Lee, Sang Hwa; Kim, In Soo [Dong-A University, Busan (Korea, Republic of)

    2009-08-15

    The failure of a Zn-plated carbon steel pipe that served as a fire sprinkler was investigated in terms of the pope's corrosion products. The pipes leaked through holes formed beneath the tubercles. The formation of oxygen concentration cell involves colonization of metal surface by aerobic bacteria or other slime formers, and anodic reaction beneath tubercle is accelerated by the presence of SRB, leading to the formation of hole beneath tubercle.

  5. 78 FR 70069 - Circular Welded Carbon-Quality Steel Pipe From China

    Science.gov (United States)

    2013-11-22

    ... in these reviews. Background The Commission instituted these reviews on June 3, 2013 (78 FR 33108) and determined on September 6, 2013 that it would conduct expedited reviews (78 FR 59371, September 26... COMMISSION Circular Welded Carbon-Quality Steel Pipe From China Determination On the basis of the record...

  6. 77 FR 19192 - Circular Welded Carbon-Quality Steel Pipe From India: Preliminary Affirmative Countervailing Duty...

    Science.gov (United States)

    2012-03-30

    ... Welded Carbon Quality Steel Pipe from the People's Republic of China, 73 FR 31970 (June 5, 2008) and.... Provision of Captive Mining Rights for Coal and Iron Ore; the Provision of High-Grade Ore for LTAR. Programs... Republic of Vietnam: Initiation of Countervailing Duty Investigations, 76 FR 72173 (November 22,...

  7. 78 FR 21105 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Preliminary Results of Antidumping...

    Science.gov (United States)

    2013-04-09

    ..., available in Antidumping Duty Order: Circular Welded Carbon Steel Pipes and Tubes from Thailand, 51 FR 8341... Duty Administrative Review, 75 FR 26922, 26923 (May 13, 2010), unchanged in Magnesium Metal From the Russian Federation: Final Results of Antidumping Duty Administrative Review, 75 FR 56989 (September...

  8. 75 FR 33578 - Certain Welded Carbon Steel Standard Pipes and Tubes from India: Preliminary Results of...

    Science.gov (United States)

    2010-06-14

    ... FR 20278 (May 1, 2009). On June 24, 2009, in response to a request from the Wheatland Tube Company... Antidumping Duty Order; Certain Welded Carbon Steel Standard Pipes and Tubes from India, 51 FR 17384 (May 12... Tubes from India, 51 FR 17384 (May 12, 1986). On May 1, 2009, the Department published in the...

  9. 77 FR 43806 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2012-07-26

    ... International Trade Administration Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the... Administrative Reviews and Request for Revocation in Part, 76 FR 82268 (December 30, 2011). The review covers 32... Charging Development Co., Ltd.; Wuxi Resources Steel Making Co., Ltd.; Wuxi Seamless Special Pipe Co.,...

  10. 77 FR 46713 - Circular Welded Carbon Steel Pipes and Tubes From Turkey: Final Results of Countervailing Duty...

    Science.gov (United States)

    2012-08-06

    ... Steel Pipe and Tube Products From Turkey, 51 FR 7984 (March 7, 1986). \\5\\ See Preliminary Results, 77 FR... Results of Countervailing Duty Administrative Review, 77 FR 19623 (April 2, 2012) (Preliminary Results... Welded Carbon Steel Standard Pipe and Tube from Turkey: Notice of Rescission of Countervailing...

  11. Internal corrosion of carbon steel piping in hot aquifers service

    Directory of Open Access Journals (Sweden)

    Simičić Miloš V.

    2011-01-01

    Full Text Available Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In terms of prediction of the remaining lifetime for water pipelines based on the corrosion allowance, the three main approaches are corrosion modelling, corrosion inhibitor availability, and corrosion monitoring. In this study we used two theoretical corrosion models, CASSANDRA and NORSOK M-506 of quite different origin in order to predict uniform corrosivity of hot aquifers in eight different pipelines. Because of the varying calculation criteria for the different models, these can give very different corrosion rate predictions for the same data input. This is especially true under conditions where the formation of protective films may occur, such as at elevated temperatures. The evaluation of models was conducted by comparison using weight-loss coupons and three corrosion inhibitors were obtained from commercial suppliers. The tests were performed during the 60-day period. Even though inhibitors’ efficiencies of 98% had been achieved in laboratory testing, inhibitors’ availabilities of 85% have been used due to logistics problems and other issues. The results, given in mmpy, i.e. millimeter per year, are very consistent with NORSOK M-506 prediction. This is presumably because the model considers the effect of the formation of a passive iron carbonate film at temperatures above 80 °C and significant reduction in corrosion rate. Corrosion inhibitor A showed a better performance than inhibitors B and C in all cases but the target corrosion rates of less than 0.1 mmpy were achieved for all inhibitors. The chemical type of corrosion inhibitor A is based on quaternary amines mixed with methanol, isopropyl alcohol, xylene and ethylbenzene. Based on the obtained results the carbon steel lifetime of 30 years, provided proper inhibitors are present and 3mm corrosion allowance, can be achieved for hot aquifers service with presented water compositions.

  12. Fatigue testing of steel pipes repaired with carbon/epoxy composites

    Energy Technology Data Exchange (ETDEWEB)

    Wilson, Jeffrey M.; Kessler, Michael R. [University of Tulsa, OK (United States). Dept. of Mechanical Engineering; Walker, Roger H.; Duell, Joshua M. [Citadel Technologies (CTI Services LLC), Tulsa, OK (United States); Kadakia, Dixit; Sousa, Nuno [T.D. Williamson, Inc., Tulsa, OK (United States)

    2005-07-01

    Fatigue tests were performed on pressure vessels to determine the effectiveness of repairs made using a carbon/epoxy composite material system. The carbon/epoxy system is intended to repair externally damaged or corroded steel pipe where blunt defects are present. 6.0 inch (15.2 cm) nominal diameter by 5.0 feet (1.52 m) long pressure vessels were constructed from A-106 Grade B steel for test purposes. Defects were machined into the outer surface of each vessel to determine limitations of the carbon/epoxy repair system. Two test plans were used in this work. The vessels of the first test plan contained relatively sharp defects and were subjected to internal pressure fluctuations between 13 and 113% of MAOP. The vessels of the second test plan contained more blunt-like defects and were cyclically pressurized from 55 to 100% of the pipe MAOP. Results indicate there is substantial increase in the performance of pipes repaired with the carbon/epoxy composite compared to those with no repairs. At the conclusion of the cyclical pressurization, the pipes with the carbon/epoxy repair were pressurized monotonically until rupture occurred. From the second test plan, the monotonic rupture data after fatigue showed no degradation in failure pressures compared with rupture data of non-fatigued vessels. (author)

  13. Effect of dynamic monotonic and cyclic loading on fracture behavior for Japanese carbon steel pipe STS410

    Energy Technology Data Exchange (ETDEWEB)

    Kinoshita, Kanji; Murayama, Kouichi; Ogata, Hiroyuki [and others

    1997-04-01

    The fracture behavior for Japanese carbon steel pipe STS410 was examined under dynamic monotonic and cyclic loading through a research program of International Piping Integrity Research Group (EPIRG-2), in order to evaluate the strength of pipe during the seismic event The tensile test and the fracture toughness test were conducted for base metal and TIG weld metal. Three base metal pipe specimens, 1,500mm in length and 6-inch diameter sch.120, were employed for a quasi-static monotonic, a dynamic monotonic and a dynamic cyclic loading pipe fracture tests. One weld joint pipe specimen was also employed for a dynamic cyclic loading test In the dynamic cyclic loading test, the displacement was controlled as applying the fully reversed load (R=-1). The pipe specimens with a circumferential through-wall crack were subjected four point bending load at 300C in air. Japanese STS410 carbon steel pipe material was found to have high toughness under dynamic loading condition through the CT fracture toughness test. As the results of pipe fracture tests, the maximum moment to pipe fracture under dynamic monotonic and cyclic loading condition, could be estimated by plastic collapse criterion and the effect of dynamic monotonic loading and cyclic loading was a little on the maximum moment to pipe fracture of the STS410 carbon steel pipe. The STS410 carbon steel pipe seemed to be less sensitive to dynamic and cyclic loading effects than the A106Gr.B carbon steel pipe evaluated in IPIRG-1 program.

  14. 75 FR 57444 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-09-21

    ... Standard, Line, and Pressure Pipe From China, 74 FR 57521 (November 6, 2009) and Certain Seamless Carbon... export restraints, the GOC is providing inputs to downstream producers of seamless pipe. \\8\\ See 75 FR at... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure...

  15. Characterization of a carbon fiber reinforced polymer repair system for structurally deficient steel piping

    Science.gov (United States)

    Wilson, Jeffrey M.

    This Dissertation investigates a carbon fiber reinforced polymer repair system for structurally deficient steel piping. Numerous techniques exist for the repair of high-pressure steel piping. One repair technology that is widely gaining acceptance is composite over-wraps. Thermal analytical evaluations of the epoxy matrix material produced glass transition temperature results, a cure kinetic model, and a workability chart. These results indicate a maximum glass transition temperature of 80°C (176°F) when cured in ambient conditions. Post-curing the epoxy, however, resulted in higher glass-transition temperatures. The accuracy of cure kinetic model presented is temperature dependent; its accuracy improves with increased cure temperatures. Cathodic disbondment evaluations of the composite over-wrap show the epoxy does not breakdown when subjected to a constant voltage of -1.5V and the epoxy does not allow corrosion to form under the wrap from permeation. Combustion analysis of the composite over-wrap system revealed the epoxy is flammable when in direct contact with fire. To prevent combustion, an intumescent coating was developed to be applied on the composite over-wrap. Results indicate that damaged pipes repaired with the carbon fiber composite over-wrap withstand substantially higher static pressures and exhibit better fatigue characteristics than pipes lacking repair. For loss up to 80 percent of the original pipe wall thickness, the composite over-wrap achieved failure pressures above the pipe's specified minimum yield stress during monotonic evaluations and reached the pipe's practical fatigue limit during cyclical pressure testing. Numerous repairs were made to circular, thru-wall defects and monotonic pressure tests revealed containment up to the pipe's specified minimum yield strength for small diameter defects. The energy release rate of the composite over-wrap/steel interface was obtained from these full-scale, leaking pipe evaluations and results

  16. Fatigue crack initiation and crack growth studies for pipes made of carbon steel

    International Nuclear Information System (INIS)

    Leak-Before-Break (LBB), a fail-safe design philosophy, is based on fatigue/fracture mechanics concepts and requires rigorous integrity assessment of piping component with postulated part through thickness flaw. It is required to be demonstrated that the unstable tearing will never occur before the crack penetrates through thickness and gives easily detectable leakage. This requires investigation on fatigue crack initiation followed by fatigue crack growth (FCG) of piping components with different postulated part through flaws for the qualification of LBB design criterion. In view of it, six numbers of tests were carried out on 8-inches Sch.100 straight pipes having circumferential part through wall notch and made of SA333Gr6 carbon steel and subjected to pure alternating bending moment using four point bend setup. The material is similar to that used in primary heat transport (PHT) piping of Indian Pressurised Heavy Water Reactor (PHWR)

  17. 78 FR 33809 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2013-06-05

    ...In response to a request from an interested party, United States Steel Corporation (``U.S. Steel''), the Department of Commerce (``the Department'') initiated an administrative review of the antidumping duty order on seamless carbon and alloy steel standard, line, and pressure pipe from the People's Republic of China. The period of review is November 1, 2011, through October 31, 2012. Based on......

  18. Detection of wall thinning of carbon steel pipe covered with insulation using Pulsed Eddy Current technique

    International Nuclear Information System (INIS)

    The test sample is a ferromagnetic carbon steel pipe having different thickness, covered with a 10 cm plastic insulation laminated by 0.4 mm Al plate to simulate the pipelines in NPPs. The PEC Probe used for the wall thinning detection consists of an excitation coil and a Hall sensor. The excitation coils in the probe is driven by a rectangular bipolar current pulse and the Hall-sensor will detects the resultant field. The Hall sensor output is considered as PEC signal. Results shows that the PEC system can detect wall thinning in an insulated pipeline of the NPPs. Local wall thinning in pipelines affects the structural integrity of industries like nuclear power plants (NPPs). In the present study a pulsed eddy current (PEC) technology to detect the wall thing of carbon steel pipe covered with insulation is developed

  19. 76 FR 19788 - Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand

    Science.gov (United States)

    2011-04-08

    ... determined on January 4, 2011 that it would conduct expedited reviews (76 FR 5205). The Commission... COMMISSION Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand... U.S.C. 1675(c)), that revocation of the antidumping duty orders on carbon steel butt-weld...

  20. 75 FR 63439 - Certain Welded Carbon Steel Standard Pipes and Tubes From India: Extension of the Final Results...

    Science.gov (United States)

    2010-10-15

    ... Results of Antidumping Duty Administrative Review, 75 FR 33578 (June 14, 2010). The review covers the... International Trade Administration Certain Welded Carbon Steel Standard Pipes and Tubes From India: Extension of... the administrative review of the antidumping duty order on certain welded carbon steel standard...

  1. Assessment of wall-thinning in carbon steel pipe by using laser-generated guided wave

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Do Yong; Cho, Youn Ho; Lee, Joon Hyun [Pusan National University, School of Mechanical Engineering, Busan (Korea, Republic of)

    2010-10-15

    The objective of this research is to estimate the crack location and size of a carbon steel pipe by using a laser ultrasound guided wave for the wall thinning evaluation of an elbow. The wall thinning of the carbon steel pipe is one of the most serious problems in nuclear power plants, especially the wall thinning of the carbon steel elbow caused by Flow-Accelerated Corrosion (FAC). Therefore, a non-destructive inspection method of elbow is essential for the nuclear power plants to operate safely. The specimens used in this study were carbon steel elbows, which represented the main elements of real nuclear power plants. The shape of the wall thinning was an oval with a width of 120mm, a length of 80mm, and a depth of 5mm. The L(0,1) and L(0,2) modes variation of the ultrasound guided wave signal is obtained from the response of the laser generation/air-coupled detection ultrasonic hybrid system represent the characteristics of the defect. The trends of these characteristics and signal processing were use dto estimate the size and location of wall thinning

  2. Cyclic deformation characteristics of carbon steel pipe with local thin area. Effect of internal pressure

    International Nuclear Information System (INIS)

    Fitness-For-Service (FFS) assessment is a quantitative engineering approach that is used to determine the equipment with a flaw or damage is fit to continue operation. It can be used to make run-repair-replace decisions to help determine if pressured equipment containing flaw can continue to operate safety for some desired future period. This paper provides a FFS assessment method on carbon steel pipe which contained a LTA (Local Thin Area) against seismic load and internal pressure load by FEM (Finite Element Method) analysis. Abaqus Ver. 6.14, which provides the combined isotropic/kinematic hardening model, is used to simulate the LTA contained carbon steel pipe against seismic load and internal pressure load. Material parameters in the hardening model are identified by a symmetric strain cycle experiment based on ASTM E606. Isotropic hardening component is introduced by specifying the equivalent stress defining the size of the yield surface, as a tabular function of the equivalent plastic strain. Kinematic hardening component is obtained from the stabilized cycle of a specimen that is subjected to symmetric stain cycles. The authors calculated up to 100 cycles on carbon steel pipe which contained a Local Thin Area against seismic load and internal pressure at room temperature. The results comparison between FEM analysis and experiment shows that delta-strain for one cycle and number of cycles to failure is predicted accurately. Safety margin of ratcheting assessment also was discussed in this paper. (author)

  3. 75 FR 9163 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's...

    Science.gov (United States)

    2010-03-01

    ... Pipe from the People's Republic of China: Initiation of Countervailing Duty Investigation, 74 FR 52945..., 73 FR 70961 (November 24, 2008) (``Line Pipe from the PRC''). In that case, the Department determined... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure...

  4. 75 FR 71672 - Circular Welded Carbon Quality Steel Pipe From the People's Republic of China: Rescission of...

    Science.gov (United States)

    2010-11-24

    ... International Trade Administration Circular Welded Carbon Quality Steel Pipe From the People's Republic of China... FR 38074 (July 1, 2010). On July 31, 2010, the Ad Hoc Coalition for Fair Pipe Imports and its... Initiation of Administrative Review, 75 FR 53274, 53276 (August 31, 2010). Rescission of Review Pursuant...

  5. 75 FR 64250 - Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of Final Antidumping Duty...

    Science.gov (United States)

    2010-10-19

    ... Tube ] from Turkey: Notice of Preliminary Results of Antidumping Duty Administrative Review, 75 FR... Standard Pipe and Tube Products From Turkey, 51 FR 17784 (May 15, 1986). Notification to Importers This... International Trade Administration Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of...

  6. 77 FR 64465 - Circular Welded Carbon-Quality Steel Pipe From the United Arab Emirates: Final Affirmative...

    Science.gov (United States)

    2012-10-22

    ... Duties; Countervailing Duties, 62 FR 27296, 27323 (May 19, 1997), and See Circular Welded Carbon-Quality... International Trade Administration Circular Welded Carbon-Quality Steel Pipe From the United Arab Emirates... countervailable subsidies are being provided to producers and exporters of circular welded carbon-quality...

  7. Detection of Signals of Mock-up Pipes of Carbon Steel and Stainless Steel using Guided Ultrasonic Waves due to Magnetostrictive Sensors

    International Nuclear Information System (INIS)

    A piping mock-up with a diameter of 6 inch and schedule number 80 of carbon steel and stainless steel were fabricated. The signals of weldments of these pipes were detected with a torsional vibration mode of frequency of 32 kHz using sensors, such as a pure Ni or a 49Fe-49Co-2V alloy strip. The signals from the 49Fe-49Co-2V alloy strip sensor were more detectable than those from the Ni strip sensor. The signals of 49Fe-49Co-2V alloy strip sensor of tile stainless steel piping mock-up were more detectable than those of 49Fe-49Co-2V alloy strip sensor of the carbon steel piping mock-up.

  8. 76 FR 56395 - Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of Extension of Time Limit for...

    Science.gov (United States)

    2011-09-13

    ... International Trade Administration Certain Welded Carbon Steel Pipe and Tube From Turkey: Notice of Extension of... and tube from Turkey for the period May 1, 2009, through April 30, 2010. See Certain Welded Carbon..., 76 FR 33204 (June 8, 2011). The final results are currently due no later than October 6,...

  9. Verification of online monitoring method on FAC test for carbon steel piping

    International Nuclear Information System (INIS)

    Recently, in the power piping, the wall-thinning problem by high temperature water and a two-phase flow (high temperature water and steam) attracts attention. Since the wall-thinning mechanism was not clarified, it is the purpose which understanding the mechanism of wall-thinning in plant, installed the piping corrosion test facility in which a long-term continuous test is possible, and started the wall-thinning examination of carbon steel piping. In addition, the ultrasonic sensor for high temperature, which can be measured in the state of the high temperature, was installed, and monitored wall thickness change during an examination period. For about two months, as a result of performing monitoring, the measured piping thickness was falling uniformly and checked that this monitoring system had caught the tendency of wall thinning. The difference of a monitoring result and the thickness measurement result after an examination was small. It identified that this monitoring system could accuracy monitoring also in high temperature. (author)

  10. Residual stress distribution in carbon steel pipe welded joint measured by neutron diffraction

    International Nuclear Information System (INIS)

    In order to estimate crack growth behavior of fatigue and stress corrosion cracking in pipes, the residual stress distribution near the pipe weld region has to be measured through the wall thickness. Since the penetration depth of neutron is deep enough to pass through the thick pipe wall, the neutron diffraction technique for the residual stress measurement is effective for this purpose. At the first step the residual stress distribution near the weld region in a butt-welded carbon steel pipe was measured by the neutron diffraction. Significant stresses extended only to a distance of 30 mm from the center of the weld. The major tensile stresses occurred in the hoop direction in the fusion and heat affected zones of the weldment, and they attained a level greater than 200 MPa through the thickness. While the axial residual stress at the inside surface was 50 MPa, the stress at the outside surface was -100 MPa. The comparison of residual stress distributions measured by the neutron diffraction, the X-ray diffraction and the strain gauge method reveals that the neutron diffraction is the most effective for measuring the residual stress inside the structural components. (author)

  11. 78 FR 21107 - Circular Welded Carbon Steel Pipes and Tubes from Turkey: Preliminary Results of Countervailing...

    Science.gov (United States)

    2013-04-09

    ... Steel Pipes and Tubes from Turkey (Preliminary Decision Memorandum) from Edward C. Yang, Senior Director... 5084: Allocation of Free Land and Purchase of Land for less than Adequate Remuneration (LTAR) F....

  12. 76 FR 8345 - Certain Carbon Steel Butt-Weld Pipe Fittings From Brazil, Japan, Taiwan, Thailand, and the People...

    Science.gov (United States)

    2011-02-14

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Carbon Steel Butt-Weld Pipe Fittings From Brazil, Japan, Taiwan, Thailand, and the People's Republic of China: Final Results of the Expedited Sunset Reviews of...

  13. 77 FR 32552 - Circular Welded Carbon-Quality Steel Pipe From the Socialist Republic of Vietnam: Preliminary...

    Science.gov (United States)

    2012-06-01

    ... Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam, 76 FR 78313... Vietnam in terms of economic development.\\10\\ On March 28, 2012, the Department requested comments from... costs of FOPs in one or more ME countries that are: (1) At a level of economic development comparable...

  14. 77 FR 19635 - Circular Welded Carbon-Quality Steel Pipe From the Sultanate of Oman: Preliminary Negative...

    Science.gov (United States)

    2012-04-02

    ... operating the agriculture, fisheries, industry, tourism, education, health and traditional crafts sectors... industry, tourism, education, health, and agriculture/fishing. (GSO QR at Appendix B.1.G-3.) In response to... Circular Welded Carbon-Quality Steel Pipe from India, the Sultanate of Oman, the United Arab Emirates,...

  15. 76 FR 78612 - Certain Welded Carbon Steel Standard Pipes and Tubes From India: Rescission of Antidumping Duty...

    Science.gov (United States)

    2011-12-19

    ... Administrative Reviews and Request for Revocation in Part, 76 FR 37781 (June 28, 2011) (Notice of Initiation...'' with a lowercase ``s'' instead of an uppercase ``s.'' See Notice of Initiation, 76 FR at 37783... International Trade Administration Certain Welded Carbon Steel Standard Pipes and Tubes From India:...

  16. 75 FR 73033 - Circular Welded Carbon Steel Pipes and Tubes from Thailand: Amended Final Results of Antidumping...

    Science.gov (United States)

    2010-11-29

    ... Thailand: Final Results of Antidumping Duty Administrative Review, 75 FR 64696 (October 20, 2010). The... clarification, see Antidumping and Countervailing Duty Proceedings: Assessment of Antidumping Duties, 68 FR... Carbon Steel Pipes and Tubes From Thailand: Final Determination of Sales at Less Than Fair Value, 51...

  17. 75 FR 28557 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Extension of Time Limit for Final...

    Science.gov (United States)

    2010-05-21

    ... Duty Administrative Review, 75 FR 18788 (April 13, 2010) (Preliminary Results). This administrative... Determination Deadlines Pursuant to the Tariff Act of 1930, As Amended, 70 FR 24533 (May 10, 2005). Accordingly... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Thailand: Extension of...

  18. 78 FR 64916 - Circular Welded Carbon Steel Pipes and Tubes From Turkey: Final Results of Countervailing Duty...

    Science.gov (United States)

    2013-10-30

    ... Review; Calendar Year 2011, 78 FR 21107 (April 9, 2013) (Preliminary Results). \\2\\ See Decision... parties. \\3\\ See Countervailing Duty Order: Certain Welded Carbon Steel Pipe and Tube Products From Turkey, 51 FR 7984 (March 7, 1986). \\4\\ See Preliminary Results. \\5\\ Petitioners in this review are...

  19. 77 FR 61738 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Final Results of Antidumping Duty...

    Science.gov (United States)

    2012-10-11

    ... Antidumping Duty Order: Circular Welded Carbon Steel Pipes and Tubes From Thailand, 51 FR 8341 (January 27... FR 20782 (April 6, 2012). DATES: Effective Date: October 11, 2012. FOR FURTHER INFORMATION CONTACT... Proceedings: Assessment of Antidumping Duties, 68 FR 23954 (May 6, 2003). Cash Deposit Requirements...

  20. 75 FR 1335 - Circular Welded Carbon Steel Pipes and Tubes from Taiwan; Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2010-01-11

    ... Administrative Reviews and Requests for Revocation in Part, 74 FR 30052 (June 24, 2009). The current deadline for... Deadlines Pursuant to the Tariff Act of 1930, As Amended, 70 FR 24533 (May 10, 2005). We intend to issue the... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes from Taiwan; Extension of...

  1. 75 FR 62366 - Circular Welded Carbon Steel Pipes and Tubes From Taiwan: Final Results of Antidumping Duty...

    Science.gov (United States)

    2010-10-08

    ... Welded Carbon Steel ] Pipes and Tubes From Taiwan, 75 FR 32911 (June 10, 2010) (Preliminary Results...) of the Act. See Preliminary Results, 75 FR at 32913. Those results apply to these final results... accordance with section 773(a)(4) of the Act. See Preliminary Results, 75 FR 32913. Analysis of...

  2. 76 FR 3612 - Circular Welded Carbon Steel Pipes and Tubes From Taiwan; Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2011-01-20

    ... Antidumping and Countervailing Duty Administrative Reviews and Requests for Revocation in Part, 75 FR 37759... Taiwan: Notice of Partial Rescission of Antidumping Duty Administrative Review, 75 FR 70723 (November 18... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Taiwan; Extension of...

  3. A Study on Effect of Local Wall Thinning in Carbon Steel Elbow Pipe on Elastic Stress Concentration

    International Nuclear Information System (INIS)

    Feeder pipes that connect the inlet and outlet headers to the reactor core in CANDU nuclear power plants are considered as safety Class 1 piping items. Therefore, fatigue of feeder pipes should be assessed at design stage in order to verify structural integrity during design lifetime. In accordance with the fatigue assessment result, cumulative usage factors of some feeder pipes have significant values. The feeder pipes made of SA-106 Grade B or C carbon steel have some elbows and bends. An active degradation mechanism for the carbon steel outlet feeder piping is local wall thinning due to flow-accelerated corrosion. Inspection results from plants and metallurgical examinations of removed feeders indicated the presence of localized thinning in the vicinity of the welds in the lower portion of outlet feeders, such as Grayloc hub-to-bend weld, Grayloc hub-to-elbow weld, elbow-to-elbow, and elbow-to-pipe weld. This local wall thinning can cause increase of peak stress due to stress concentration by notch effect. The increase of peak stress results in increase of cumulative usage factor. However, present fatigue assessment doesn't consider the stress concentration due to local wall-thinning. Therefore, it is necessary to assess the effect of local wall thinning on stress concentration. This study investigates the effect of local wall thinning geometry on stress concentration by performing finite element elastic stress analysis

  4. Analysis of Residual Stresses and Distortions in Girth-Welded Carbon Steel Pipe

    Directory of Open Access Journals (Sweden)

    Prabhat Kumar Sinha,

    2013-05-01

    Full Text Available This article, the weld joint suffers various types of weld-induced residual stress fields (hoop and axial and deformation patterns (axial shrinkage, radial shrinkage. In this paper Three-dimensional finite element modeling of residual stresses in a girth-welded carbon steel pipe is presented with an emphasis on modeling procedures for the global residual stress characteristics. To precisely capture the distortions and residual stresses, computational methodology based on three-dimensional finite element model for the simulation of gas tungsten arc welding in thin-walled pipe is presented. Butt-weld geometry with single "V" for a 300 mm outer diameter cylinder of 3 mm thick is used. The complex phenomenon of arc welding is numerically solved by sequentially coupled transient, non-linear thermo-mechanical analysis. The accuracy of both the thermal and structural models is validated through experiments for temperature distribution, residual stresses and distortion. The simulated result shows close correlation with the experimental measurements.

  5. Guided Wave Sensing In a Carbon Steel Pipe Using a Laser Vibrometer System

    Science.gov (United States)

    Ruíz Toledo, Abelardo; Salazar Soler, Jordi; Chávez Domínguez, Juan Antonio; García Hernández, Miguel Jesús; Turó Peroy, Antoni

    2010-05-01

    Non-Destructive Evaluation (NDE) techniques have achieved a great development during the last decades as a valuable tool for material characterization, manufacturing control and structural integrity tests. Among these tools, the guided wave technology has been rapidly extended because it reduces inspection time and costs compared to the ordinary point by point testing in large structures, as well as because of the possibility of inspecting under insulation and coating conditions. This fast development has motivated the creation of several inspection and material characterization systems including different technologies which can be combined with this technique. Different measurements systems based on laser techniques have been presented in order to inspect pipes, plates and diverse structures. Many of them are experimental systems of high cost and complexity which combine the employment of a laser for generation of waves in the structure and an interferometer for detection. Some of them employ air-coupled ultrasound generation transducers, with high losses in air and which demand high energy for exciting waves in materials of high stiffness. The combined employment of a commercial vibrometer system for Lamb wave sensing in plates has been successfully shown in the literature. In this paper we present a measurement system based on the combined employment of a piezoelectric wedge transducer and a laser vibrometer to sense guided acoustic waves in carbon steel pipes. The measurement system here presented is mainly compounded of an angular wedge transducer, employed to generate the guided wave and a commercial laser vibrometer used in the detection process. The wedge transducer is excited by means of a signal function generator whose output signal has been amplified with a power signal amplifier. A high precision positioning system is employed to place the laser beam at different points through the pipe surface. The signal detected by the laser vibrometer system is

  6. Ductile fracture behavior of 6-inch diameter type 304 stainless steel and STS 42 carbon steel piping containing a through-wall or part-through crack

    International Nuclear Information System (INIS)

    The double ended guillotine break philosophy in the design base accident of the nuclear power plant is considered to be overly conservative from the view point of piping design. Through the past experiences and developments of the fabrication, inspection, and operation of nuclear power plants, it has been recognized that the Leak-Before-Break (LBB) concept can be justified in the LWR pressure boundary pipings. In order to verify the LBB concept, extensive experimental and theoretical works are being conducted in many countries. Furthermore, a revised piping design standard, in which LBB concept is introduced, is under preparation in Japan, U.S.A., and European countries. At JAERI, a research program to investigate the unstable ductile fracture behavior of LWR piping under bending load has been carried out as a part of the LBB verification researches since 1983. This report summarizes the result of the ductile fracture tests conducted at room temperature in 1983 and 84. The 6-inch diameter pipes of type 304 stainless steel and STS 42 carbon steel pipe with a through-wall or part-through crack were tested under bending load with low or high compliance condition at room temperature. Pipe fracture data were obtained from the test as regards to load- displacement curve, crack extension, net section stress, J-resistance curve, and so on. Besides, the influence of the compliance on the fracture behavior was examined. Discussions are performed on the ductile pipe fracture criterion, flaw evaluation criterion, and LBB evaluation method. (author)

  7. Application of cyclic J-integral to low cycle fatigue crack growth of Japanese carbon steel pipe

    Energy Technology Data Exchange (ETDEWEB)

    Miura, N.; Fujioka, T.; Kashima, K. [and others

    1997-04-01

    Piping for LWR power plants is required to satisfy the LBB concept for postulated (not actual) defects. With this in mind, research has so far been conducted on the fatigue crack growth under cyclic loading, and on the ductile crack growth under excessive loading. It is important, however, for the evaluation of the piping structural integrity under seismic loading condition, to understand the fracture behavior under dynamic and cyclic loading conditions, that accompanies large-scale yielding. CRIEPI together with Hitachi have started a collaborative research program on dynamic and/or cyclic fracture of Japanese carbon steel (STS410) pipes in 1991. Fundamental tensile property tests were conducted to examine the effect of strain rate on tensile properties. Cracked pipe fracture tests under some loading conditions were also performed to investigate the effect of dynamic and/or cyclic loading on fracture behavior. Based on the analytical considerations for the above tests, the method to evaluate the failure life for a cracked pipe under cyclic loading was developed and verified. Cyclic J-integral was introduced to predict cyclic crack growth up to failure. This report presents the results of tensile property tests, cracked pipe fracture tests, and failure life analysis. The proposed method was applied to the cracked pipe fracture tests. The effect of dynamic and/or cyclic loading on pipe fracture was also investigated.

  8. The evaluation of erosion/corrosion problems of carbon steel piping in Taiwan PWR nuclear power plant

    International Nuclear Information System (INIS)

    Taiwan pressurized water reactor (PWR), Maanshan nuclear power plant Units 1 and 2 implemented measurements of the wall thinning of the carbon steel piping under the request of regulation authority to prevent the events due to erosion/corrosion since 1989. At first, the licensee established the comprehensive inspection program by itself. Over 2000 components were inspected per unit and 300-500 pipe components were examined by ultrasonic testing per scheduled outage. The simple predictive methodology determined the operability of each individual piping component in the next fuel cycle. Based on the inspection results, the susceptible pipe components were established. Implementation of effective correction management and an improved inspection program can improve the safety, as well as the efficiency, of long-term reactor operations. (orig.)

  9. Analysis of flow on grooving corrosion at the weld of a carbon steel pipe made by electrical resistance welding

    International Nuclear Information System (INIS)

    Lots of researches were gone already about grooving corrosion mechanism of ERW carbon steel pipe. But there is seldom study for water hammer happened by fluid and acceleration of corrosion rate by increased flow velocity. Therefore, in this study carried out the analysis based on hydrodynamic and fracture mechanics. Analyzed stress that act on a pipe using ANSYS as a program, and also FLUENT and STAR-CD were used for flow phenomenon confirmation. As the result, fatigue failure is happened by water hammer and corrosion rate was increased because of turbulent flow

  10. 76 FR 21331 - Certain Carbon Steel Butt-Weld Pipe Fittings From Brazil, Japan, Taiwan, Thailand, and the People...

    Science.gov (United States)

    2011-04-15

    ...On October 1, 2010, the Department of Commerce (the Department) initiated the third sunset reviews of the antidumping duty orders on carbon steel butt-weld pipe fittings from Brazil, Japan, Taiwan, Thailand, and the People's Republic of China (PRC), pursuant to section 751(c) of the Tariff Act of 1930, as amended (the Act). See Initiation of Five-Year (``Sunset'') Review, 75 FR 60731 (October......

  11. Quantitative Evaluation of Defects in Carbon Steel Pipes Using Laser-Generated Guided Waves

    International Nuclear Information System (INIS)

    The objective of this study is the development of non-destructive evaluation technique of defect sizing using laser-generated guided waves. For this aim, 6 mm-thick carbon steel pipes with ellipse-shaped defects of varying depth or width were used as specimens and a non-contacting hybrid system of laser/generation and air-coupled transducer/detection as the inspection system. In addition, linear slit array was employed to generate and receive the specific mode of guided waves selectively and to enhance the directivity of waves generated by laser. The specific modes from the response obtained by the above system were identified by time-frequency analysis and the amplitude of each node was measured. The obtained results shows that the ratio between the amplitudes of specific modes after the defects is proportional to the depth and the width of the defect and the trends of these characteristics can be utilized for evaluating defect sizing quantitatively.

  12. Velocity guidelines for preventing pitting of carbon steel piping when the flowing medium contains CO{sub 2} and sand

    Energy Technology Data Exchange (ETDEWEB)

    Shadley, J.R.; Shirazi, S.A.; Dayalan, E.; Rybicki, E.F. [Univ. of Tulsa, OK (United States)

    1996-08-01

    In carbon steel piping systems handling fluids containing water and dissolved CO{sub 2}, under a range of conditions, an FeCO{sub 3} (iron carbonate) scale can form on the pipe wall and provide a measure of protection against CO{sub 2} corrosion. If the fluid also contains sand, particles of sand impinging the pipe wall can remove the protective scale or prevent it from adhering to the pipe wall. Without the scale to protect the pipe, CO{sub 2} corrosion can progress at an accelerated rate. This process is referred to by many as erosion-corrosion. Whether erosion-corrosion occurs and how severe it will be depend on environmental factors such as pH and temperature, and on how erosive the conditions are, i.e., the erosivity. Factors that determine erosivity include fluid properties, flow parameters, and sand conditions. For other factors held constant, when flow velocities are low, FeCO{sub 3} scale provides protection for all pipe surfaces. In high velocity flows, scale is not able to adhere anywhere on the pipe wall, and CO{sub 2} corrosion proceeds uniformly over the surface of the pipe. But, at intermediate velocities, pitting can occur at sand particle impingement points resulting in extremely high penetration rates. Flow velocities defining the boundaries between these three erosion-corrosion behaviors are called threshold velocities. In previous work, threshold velocities were determined for laboratory and representative oilfield conditions. In this paper, threshold velocities are determined and compared for conditions with and without a commercial imidazoline type inhibitor. Threshold velocities presented are based on experimental results from a flow loop circulating water, oil, inhibitor and sand and on a computer program for predicting sand erosion.

  13. Experimental and estimated crack mouth opening displacements on carbon and stainless steel pipes under monotonic and cyclic bending load

    International Nuclear Information System (INIS)

    During last ten years ENEA funded several research programs with the objective of studying the fracture behavior of cracked pipes. In the framework of national programs almost 100 carbon and stainless steel pipes were tested under quasi-static bending moment. In 1988 ENEA joined the International Piping Integrity Research Group (IPIRG), a consortium of organizations from nine nations: Canada, France, Italy, Japan, Sweden, Switzerland, Taiwan, the United Kingdom and the United States. This 5-year program was conducted at Battelle Laboratories and was completed in June 1991. The scope of this paper is the comparison between Crack Mouth Opening Displacement (CMOD) estimation scheme calculations and IPIRG data relative to displacement controlled tests. Since CMODs are necessary to evaluate the leak area associated to through-wall cracks postulated in Leak Before Break analysis of nuclear power plant pipeline, the accuracy in the prediction of CMODs becomes fundamental. (author)

  14. Flow accelerated corrosion of carbon steel piping in nuclear power plants

    International Nuclear Information System (INIS)

    as an effective device to evaluate the velocity sensitivity of corrosion reaction in high temperature water. An electrochemical analysis was performed to evaluate the effects of fluid flow and dissolved oxygen on the corrosion behavior of carbon steel and to correlate electrochemical aspect with the flow accelerated corrosion rate. In neutral pH water containing 2 ppb oxygen, the ECP and corrosion current density were increased with rotation of electrode. Corrosion current density showed similar tendency with a wall shear stress on the surface of electrode due to the fluid flow. The wall shear stress might cause a decrease in the mass transfer boundary layer thickness resulting in increase in the rate of the corrosion reaction due to faster diffusion of the soluble corrosion product into the bulk solution. When the oxygen concentration exceeds a threshold concentration, the cathodic current previously supplied by the hydrogen evolution reaction is substituted by an equivalent reaction due to oxygen reduction. Thus, the ECP increases up to the range of hematite which has a very low solubility and electric conductivity. The hematite formation would lead to inhibit flow accelerated corrosion. The effects of a magnetic field on the FAC behavior of a low alloy steel were evaluated to develop a method to mitigate against feeder wall thinning. A magnet-attached rotating cylinder electrode and piping steel covered with simulated oxide film were used in potentiodynamic test and erosion test to determine the magnetic effect on electrochemical and erosional aspect of the oxide layer, respectively. An Electrochemical corrosion reaction was active in the magnetic field because the local mass transfer rate was increased by the magnetohydrodynamic force generated by a coupling of the electric and magnetic field. However, the magnetic field effect decreased with increasing temperature and rotation velocity. Those might be come from the facts that the thickness of the diffusion layer

  15. Electron Cloud in Steel Beam Pipe vs Titanium Nitride Coated and Amorphous Carbon Coated Beam Pipes in Fermilab's Main Injector

    Energy Technology Data Exchange (ETDEWEB)

    Backfish, Michael

    2013-04-01

    This paper documents the use of four retarding field analyzers (RFAs) to measure electron cloud signals created in Fermilab’s Main Injector during 120 GeV operations. The first data set was taken from September 11, 2009 to July 4, 2010. This data set is used to compare two different types of beam pipe that were installed in the accelerator. Two RFAs were installed in a normal steel beam pipe like the rest of the Main Injector while another two were installed in a one meter section of beam pipe that was coated on the inside with titanium nitride (TiN). A second data run started on August 23, 2010 and ended on January 10, 2011 when Main Injector beam intensities were reduced thus eliminating the electron cloud. This second run uses the same RFA setup but the TiN coated beam pipe was replaced by a one meter section coated with amorphous carbon (aC). This section of beam pipe was provided by CERN in an effort to better understand how an aC coating will perform over time in an accelerator. The research consists of three basic parts: (a) continuously monitoring the conditioning of the three different types of beam pipe over both time and absorbed electrons (b) measurement of the characteristics of the surrounding magnetic fields in the Main Injector in order to better relate actual data observed in the Main Injector with that of simulations (c) measurement of the energy spectrum of the electron cloud signals using retarding field analyzers in all three types of beam pipe.

  16. 49 CFR 192.55 - Steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Steel pipe. 192.55 Section 192.55 Transportation... BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Materials § 192.55 Steel pipe. (a) New steel pipe is... in accordance with paragraph (c) or (d) of this section. (b) Used steel pipe is qualified for...

  17. Features and mechanism of unusual wall thinning. (Erosion-corrosion) of the carbon steel pipe carrying hot pure water

    International Nuclear Information System (INIS)

    The features of unusual wall thinning of carbon steel piping used in the transport of pure water at elevated temperatures are described. The case of Mihama nuclear power plant is used as a typical example, since the results of investigations conducted by the investigation committee of the Nuclear and Industrial Safety Agency are already available at their web site, and detailed information, such as data on residual wall thickness distribution and clear photographs of the thinned pipe wall surface etc. are readily available. Two models for illustrating the generation mechanism were examined: the FAC (flow accelerated corrosion) model and the macro-cell corrosion model. The latter explained the mechanism reasonably well, and methods for preventing wall thinning, based on this model, are given. Procedures for detecting the progress of wall thinning were also described. (author)

  18. Development of Wall Thinning Distinction Method using the Multi-inspecting UT Data of Carbon Steel Piping

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, Kyeong Mo; Yun, Hun; Lee, Chan Kyoo [KEPCO E and C, Yongin (Korea, Republic of)

    2012-05-15

    To manage the wall thinning of carbon steel piping in nuclear power plants, the utility of Korea has performed thickness inspection for some quantity of pipe components during refueling outages and determined whether repair or replacement after evaluating UT (Ultrasonic Test) data. When the existing UT data evaluation methods, such as Band, Blanket, PTP (Point to Point) Methods, are applied to a certain pipe component, unnecessary re-inspecting situations may be generated even though the component does not thinned. In those cases, economical loss caused by repeated inspection and problems of maintaining the pipe integrity followed by decreasing of newly inspected components may be generated. EPRI (Electric Power Research Institute) in USA has suggested several statistical methods, TPM (Total Point Method), LSS (Least Square Slope) Method, etc. to distinguish whether multiple inspecting components have thinned or not. This paper presents the analysis results for multiple inspecting components over three times based on both NAM (Near Area of Minimum) Method developed by KEPCO-E and C and the other methods suggested by EPRI.

  19. Technology Based on Wall-Thinning Prediction and Numerical Analysis Techniques for Wall-Thinning Analysis of Small-Bore Carbon Steel Piping

    International Nuclear Information System (INIS)

    In approximately fifty utilities, including KHNP (Korea Hydro and Nuclear Power), CHECWORKS is used as a tool for predicting and managing the wall thinning of carbon steel piping; this wall thinning is caused by flow-accelerated corrosion (FAC). It is known that CHECWORKS is only applicable to predict the wall thinning of piping with large bores. When dealing with small-bore steel piping, FAC engineers measure the thickness of the susceptible area that is selected on the basis of the experience and judgment of the engineer. This paper proposes the application of CHECWORKS for the management of wall thinning of small-bore piping. Four small-bore pipelines of a domestic nuclear power plant were analyzed from the viewpoints of FAC and fluid dynamics by using CHECWORKS and FLUENT code. Depending on the engineer's skill, CHECWORKS can also be used for the management of wall thinning of small-bore piping

  20. Steels for large steam pipes

    International Nuclear Information System (INIS)

    Presented are the results of pilot-scale operation and scientific investigation of metal of pipes 500 to 1100 mm in diameter manufactured by various techniques from 15Kh1M1F steel. The structure and the properties of the metal of ten meltings were investigated for homogeneity in the following zones: base metal, near-weld zone and weld metal. It was found that the macrostructure of pipes cast by a centrifugal method has a fairly dense structure; there is homogeneity across and lengthwise of the pipe. After a heat treatment, the metal of centrifugally cast pipes has both high short-time and long-time properties. Introduction of centrifugally cast pipe manufacture opens possibilities for using larger pipes in steam conduits of hot intermediate superheating devices

  1. EMAT Technology for a Wall Thickness Measurement of an Oxide Scaled Carbon Steel Piping

    International Nuclear Information System (INIS)

    EMAT(Electro-Magnetic Acoustic Transducer) uses a combination of static and dynamic magnetic fields to convert electrical energy into acoustic energy. The static magnetic field is induced by permanent magnet and the dynamic magnetic field is produced by the electrical coil. There are two contributions from an EMAT transducer that generate an ultrasonic signal. The first contribution is the Lorentz Force which is the most commonly utilized contribution within the NDT industry. The second contribution from an EMAT transducer utilizes the magnetostrictive force, which is less well-known. The sample that will be examined within this paper involves the presence of a high temperature oxide scale that is commonly found on the external walls of boiler tubes. The high temperatures, in excess of 500 .deg. C or 1000 .deg. F, can cause the steam and flue gas constituents to react with steel to form a brittle iron oxide called magnetite on the inside and outside surfaces of a steel boiler tubing. The magnetostrictive EMAT can produce ultrasonic signals under a specific condition, such as, the presence of magnetic conductive materials. Hence, the objective of this study is to investigate the feasibility of a magnetostrictive EMAT for an effective inspection of material loss for a nuclear power piping system

  2. Orbital plasma keyhole welding of 12--13% Cr low carbon martensitic line pipe steels and weld joint corrosion properties

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmeister, H.; Dietrich, S. [Univ. der Bundeswehr Hamburg (Germany); Tystad, M.; Knagenhjelm, H.O.; Andersen, T.R. [Norsk Hydro A/S Porsgrunn (Norway). Forskningssenteret

    1995-10-01

    Based on requirements for more economical pipe laying procedures in the oil and gas industry, the potential of the orbital plasma keyhole process for welding of 12--13% Cr martensitic low carbon steels together with resulting hardness and corrosion properties is investigated. As a result, downhill orbital welding speeds up to 6--7 mm/s at 6--10 mm wall thickness are achieved. For hardness reduction, local postweld heating of 600--700 C at up to 10 min was required. Pitting corrosion resistance of the weld joints was reduced by welding but could be restored by postweld heating above 750--800 C, which, however, might produce hardness levels not satisfying NACE requirements due to formation of untempered martensite.

  3. The evaluation of erosion-corrosion problems in Taiwan PWR carbon steel piping

    International Nuclear Information System (INIS)

    Taiwan PWR Nuclear Power Plant Units 1 and 2 implemented the projects of Pipe Wall Thinning Measurement under the request of ROCAEC to prevent the events due to the piping erosion/corrosion. The purpose of this paper is to present the improvements in the evaluation method for the identification of the potential piping systems and components in PWR

  4. Development of on-line thickness monitoring system for carbon steel piping in nuclear power plant

    International Nuclear Information System (INIS)

    The feeder pipes of CANDU plant have been thinning due to the flow accelerated corrosion (FAC) as the operation years increased. Accurate measurement of pipe thickness is needed to estimate the thinning rate and to evaluate the remaining life. But measuring the piping thickness manually with portable equipment during power operation is impossible because of high radiation and high temperature. So KEPRI designed on-line remote thickness monitoring equipment (FACOM-F) using personal computer and ultrasonic wave. We can detect signal in bent area of the piping. The equipment was installed at Wolsong-1 NPP and validated to be used at the actual plant operation condition.

  5. 78 FR 286 - Circular Welded Carbon Steel Pipes and Tubes From Turkey; Amended Final Results of Antidumping...

    Science.gov (United States)

    2013-01-03

    ... and Tube From Turkey: Notice of Final Results of Antidumping Duty Administrative Review, 76 FR 76939..., 77 FR 72818 (December 6, 2012) (Final Results). \\2\\ The Borusan Group includes the following entities...., Borusan Ithicat ve Dagitim A.S., and Tubeco Pipe and Steel Corporation. See Final Results, 77 FR at...

  6. 75 FR 4529 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Final Results of Antidumping Duty New...

    Science.gov (United States)

    2010-01-28

    ... Steel Pipes and Tubes from Thailand: Preliminary Results of Antidumping Duty New Shipper Review, 74 FR... New Shipper Review, 74 FR 59961 (November 19, 2009). Scope of the Order The products covered by this... Less Than Fair Value, 51 FR 3384 (January 27, 1986). These cash deposit requirements shall remain...

  7. Ratchetting behavior of primary heat transport (PHT) piping material SA-333 carbon steel subjected to cyclic loads at room temperature

    International Nuclear Information System (INIS)

    Ratchetting behavior of SA-333 Gr. 6 carbon steel used as primary heat transport (PHT) piping material has been investigated with three constitutive models proposed by Armstrong-Frederick, Chaboche and Ohno-Wang involving different hardening rules. Performance of the above mentioned models have been evaluated for a broad set of uniaxial and biaxial loading histories. The uniaxial ratchetting simulations have been performed for a range of stress ratios (R) by imposing different stress amplitudes and mean stress conditions. Numerical simulations indicated significant ratchetting and opening of hysteresis loop for negative stress ratio with constant mean stress. Application of cyclic stress without mean stress (R = -1.0) has been observed to produce negligible ratchet-strain accumulation in the material. Simulation under the biaxial stress condition was based on modeling of an internally pressurized thin walled pipe subjected to cyclic bending load. Numerical results have been validated with the experiments as per simulation conditions. All three models have been found to predict the observed accumulation of circumferential strain with increasing number of cycles. However, the Armstrong Frederick (A-F) model was found to be inadequate in simulating the ratchetting response for both uniaxial as well as biaxial loading cases. The A-F model actually over-predicted the ratchetting strain in comparison with the experimental strain values. On the other hand, results obtained with the Chaboche and the Ohno-Wang models for both the uniaxial as well as biaxial loading histories have been observed to closely simulate the experimental results. The Ohno-Wang model resulted in better simulation for the presents sets of experimental results in comparison with the Chaboche model. It can be concluded that the Ohno-Wang model suited well compared to the Chaboche model for above sets of uniaxial and biaxial loading histories. (authors)

  8. Verification of FAC mitigation effect by water chemistry improvement in PWR secondary system using continuous monitoring system of wall thickness of carbon steel piping

    International Nuclear Information System (INIS)

    Flow Accelerated Corrosion (FAC) of carbon steel (CS) piping is one of main issues in secondary system of Pressurized Water Reactor (PWR) nuclear power plant. Wall thinning of CS piping due to FAC increases potential risk of pipe rupture, cost for inspection and replacement of damaged pipes. In particular, corrosion products generated by FAC of CS piping brought steam generator (SG) tube corrosion and degradation of thermal performance, when it intruded and accumulated in secondary side of PWR. Therefore, we estimated an applicability and effectiveness of Oxygenated Water Chemistry (OWC) as a new approach to FAC suppression for PWR secondary system by experiment in laboratory and demonstration test at Tsuruga-2 (1160 MWe PWR, commercial operation started in 1987). Based on this result, OWC has been applied to condensate system in Tsuruga-2 from Jan. 2011. And, to evaluate the FAC mitigation effect of OWC, wall thickness of actual condensate piping in Tsuruga-2 after OWC application was measured by continuous monitoring system, using high-temperature and high-resolution ultrasonic probe. In this paper, behavior of actual wall thinning rate of condensate piping in Tsuruga-2 under various pH and DO concentration is discussed. (author)

  9. 77 FR 19711 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From Germany...

    Science.gov (United States)

    2012-04-02

    ... Germany (60 FR 39704). Following the first five-year reviews by Commerce and the Commission, effective... from Germany (66 FR 37004). Following the second five-year reviews by Commerce and the Commission... pipe from Germany (72 FR 28026). The Commission is now conducting a third review to determine...

  10. Flow accelerated corrosion of carbon steel feeder pipes from pressurized heavy water reactors

    International Nuclear Information System (INIS)

    Detailed investigation of a number of feeder pipes received from Rajasthan Atomic Power Station Unit 2 (RAPS no. 2) after en-masse feeder pipe replacement after 15.67 Effective Full Power Years (EFPYs) was carried out. Investigations included ultrasonic thickness measurement by ultrasonic testing, optical microscopy, scanning electron microscopy, chemical analysis and X-ray Diffraction (XRD). Results showed that maximum thickness reduction of the feeder had occurred downstream and close to the weld in 32 NB (1.25″/32.75 mm ID) elbows. Rate of Flow Accelerated Corrosion (FAC) was measured to be higher in the lower diameter feeder pipes due to high flow velocity and turbulence. Weld regions had thinned to a lower extent than the parent material due to higher chromium content in the weld. A weld protrusion has been shown to add to the thinning due to FAC and lead to faster thinning rate at localized regions. Surface morphology of inner surface of feeder had shown different size scallop pattern over the weld and parent material. Inter-granular cracks were also observed along the weld fusion line and in the parent material in 32 NB outlet feeder elbow.

  11. Microstructural investigation on operated carbon steel feeder pipes of Indian reactors

    International Nuclear Information System (INIS)

    En-masse feeder replacement was done at RAPS-2 after detecting a pinhole leak in one of the outlet feeder elbow during inspection at reactor site. Some of the feeders, removed after a service of 15.67 EFPY were received for detailed investigation. Ultrasonic thickness measurement of the feeders was carried out to ascertain the loss in wall thickness due to Flow Accelerated Corrosion (FAC). Detailed microscopic investigations have been carried out on a few representative samples. The sample location was chosen such that it included the weld region, parent metal and the overlayed material deposited on the pipe to compensate for thickness reduction. Noticeable variation in microstructure over weld pool, HAZ, and parent metal were observed. Maximum FAC is occurring in the heat- affected zone of the weld in 32 NB elbows which shows the decisive role played by microstructure. Weld metal is affected to a lower extent than the parent metal due to FAC. Scanning electron microscopy of FAC affected areas reveal that degradation is affected by mechanical, thermal and chemical factors acting simultaneously. Dissolution of protecting magnetite layer during reactor operation was studied by SEM, XRD, stereo and optical microscopy. Different regions were observed in the overlayed feeder pipe sample with parent metal and deposited metal appearing as distinct layers. A lack of fusion cavity with oxide layer embedded inside was also observed after polishing and etching. Variation in grain morphology was noted inner to outer surface of the pipe. Detailed mapping of microstructure shows magnetite scallops of variable thickness in HAZ and weld pool region. This paper presents some of the microstructural observations and findings on FAC to explain the mechanism of degradation of feeders. (author)

  12. Flow accelerated corrosion of carbon steel feeder pipes from Indian reactors

    International Nuclear Information System (INIS)

    En-masse feeder replacement was done at RAPS-2 after occurrence of a pinhole leak in B12 (S) outlet feeder elbow. Some of the feeders, removed after a service of 15.67 EFPY were received for detailed investigation. Ultrasonic thickness measurement of the feeders was carried out to ascertain the loss in wall thickness due to Flow Accelerated Corrosion (FAC) and marking the region of interest from outside. Surface morphology of inner surface of a number of feeder samples were carried out by SEM near the HAZ and adjoining area. Maximum FAC had occurred in the heat-affected zone of the weld in 32 NB elbows. Weld was affected to a lower extent than the parent metal due to higher chromium content. IGSCC cracks were also observed in parent metal portion of the middle elbow in 32 NB outlet feeder pipe due to bending residual stresses. There are two life limiting reasons to curtail the useful life in the reactors namely FAC and IGSCC. The problem of FAC can be reduced by increasing chromium content and reducing the flow velocity by opting for higher diameter feeder pipes. The welding defects and residual stresses in HAZ and surrounding areas are detrimental for FAC and IGSCC in the elbow region. This paper presents some of the microstructural observations and findings on FAC to explain the mechanism of degradation of feeders. (author)

  13. Plasma coating used to evaluate resistance against flow accelerated corrosion on carbon steel feeder pipe material for pressurized heavy water reactor

    International Nuclear Information System (INIS)

    A collaborative study on plasma nitriding was initiated by Water and Steam Chemistry Division, BARC Facilities, Kalpakkam, with FCIPT, a division of Institute of Plasma Research. In order to control the influence of Flow Accelerated Corrosion (FAC) on feeder pipe of PHWR reactor, coating by plasma nitriding process was carried out inside the pipe as a remedy.This is one of the methods to control the wall thickness reduction of carbon steel feeder pipe and the influence of FAC in PHWR (Pressurized heavy water reactor). Specimen of 15 mm NB Sch 80 straight pipe length of 100 mm pipe module section of low carbon steel ASTM 106 Gr. B were plasma nitrided at FCIPT, IPR for optimization of the process parameters. The wall thickness of the sample was measured axially and circumferentially by Ultrasonic thickness gauge with specific marking with templates before carrying out plasma nitriding process. During plasma nitriding the temperature was maintained at 520 °C for 24 hours. The samples after coating were checked for thickness variation by Raman spectroscopy as well as microscopy, and it was found that the coating was uniform and coating consisted of iron nitrides only. For functional test, to check the corrosion resistance, a specimen holder was designed and fabricated for the treated specimen such that it can withstand a velocity of 7 m/s. The holder was mounted in SIM loop outlet of heater. The SIM loop was maintained at 120 °C and 7 m/s for about 30 days with less than 20 ppb dissolved oxygen condition. Preliminary experiments on plasma nitriding have been carried out and checked in SIM loop in order to check the resistance to FAC under neutral pH condition. (author)

  14. 75 FR 973 - Certain Welded Stainless Steel Pipes From the Republic of Korea: Preliminary Results of...

    Science.gov (United States)

    2010-01-07

    ... Welded Stainless Steel Pipes from Korea, 57 FR 62301 (Dec. 30, 1992), as amended in Notice of Amended... Sales at Less than Fair Value: Certain Cut-to-Length Carbon Steel Plate from South Africa, 62 FR 61731... International Trade Administration Certain Welded Stainless Steel Pipes From the Republic of Korea:...

  15. Verification of FAC mitigation effect by water chemistry improvement in PWR secondary system using continuous monitoring system of wall thickness of carbon steel piping

    International Nuclear Information System (INIS)

    Flow Accelerated Corrosion (FAC) of carbon steel (CS) piping is one of main issues in secondary system of Pressurized Water Reactor (PWR) nuclear power plant. Therefore, Oxygenated Water Chemistry (OWC) as a new approach to FAC suppression for PWR secondary system was applied to condensate system of Tsuruga-2 (1160 MWe PWR, commercial operation started in 1987) in Jan. 2011. To evaluate the FAC mitigation effect of OWC, wall thickness of actual condensate piping in Tsuruga-2 after OWC application was measured by continuous monitoring system, using high-temperature and high-resolution ultrasonic probe. As a result, it was demonstrated that FAC was mitigated by more than 5ppb of oxygen under Low-AVT (pH9.3) condition, and FAC was almost stopped even in 2ppb of oxygen under High-AVT (pH9.8) condition. (author)

  16. Application of in-service temperature lowering to reduce radioactivity corrosion product deposition on carbon steel piping of BWR residual heat removal system

    International Nuclear Information System (INIS)

    Assessment of plant data and experiments on deposition of ion species on carbon steel were carried out in order to develop suitable countermeasures to reduce RHR (residual heat removal) piping dose rate. It was thought that radioactivity deposits on the RHR piping were mainly from radioactive ion species in the coolant and they were enhanced by the dehydration reaction of corrosion products on the piping. From an evaluation for temperature dependence of the dehydration reaction, it was proposed to lower the start-up temperature of RHR operation as a way to reduce radioactivity deposition. Feasibility studies of improved RHR operation were conducted and test operations were carried out in the Shika Nuclear Power Station Unit 1. Application of the improved RHR operation resulted in a temperature reduction from 150degC to 110degC, and a radioactivity deposition reduction on the RHR piping to one-fifth of that in conventional RHR operation. The improved RHR operation has now been applied to more than fifteen Japanese BWRs and significant suppression effects of radioactivity deposition have been observed. (author)

  17. 49 CFR 192.105 - Design formula for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Design formula for steel pipe. 192.105 Section 192... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.105 Design formula for steel pipe. (a) The design pressure for steel pipe is determined in accordance with the...

  18. A study on the hydrogen embrittlement mitigation of carbon and low alloy steel for nuclear power plan piping

    International Nuclear Information System (INIS)

    A new concept in implementing hydrogen embrittlement (HE) mitigation on nuclear piping materials was suggested by using electro-transport treatment. The electro-transport treatment can be applied to reduce HE susceptibility and thus make the material more resistant to hydrogen damage. To demonstrate the validation of the developed method, the effect of hydrogen on the tensile properties of SA-508 Grade 1-A low alloy steel was investigated by slow strain rate test (SSRT). Material characteristics were observed as a function of hydrogen charging condition and electro-transport treatment. In SSRT results, SA-508 low alloy steel was not susceptible to hydrogen embrittlement. However, significant embrittlement was found for a specimen at applied cathodic potentials plus loading condition. When electro-transport treatment was performed, however, the ductility of the specimen was much higher than those of tested in air. These experimental results suggest that electro-transport treatment can be a potential method to mitigate the sensitivity of hydrogen embrittlement and could replace the conventional post-weld heat treatment

  19. 49 CFR 192.309 - Repair of steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Repair of steel pipe. 192.309 Section 192.309... Lines and Mains § 192.309 Repair of steel pipe. (a) Each imperfection or damage that impairs the serviceability of a length of steel pipe must be repaired or removed. If a repair is made by grinding,...

  20. 76 FR 72164 - Circular Welded Carbon-Quality Steel Pipe From India, the Sultanate of Oman, the United Arab...

    Science.gov (United States)

    2011-11-22

    ... Standard Pipes and Tubes from India, 51 FR 17384 (May 12, 1986). Therefore, the scope of this investigation... Standard Pipes and Tubes from India, 51 FR 17384 (May 12, 1986). Therefore, the scope of this investigation... surrogate country because it is a market economy that is at a comparable level of economic development...

  1. Ultimate Bending Capacity of Strain Hardening Steel Pipes

    Institute of Scientific and Technical Information of China (English)

    陈严飞; 张娟; 张宏; 李昕; 周晶; 曹静

    2016-01-01

    Based on Hencky’s total strain theory of plasticity, ultimate bending capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material, the simplified analytical solution is proposed as well. Good agreement is observed when ultimate bending capacities obtained from analytical solutions are compared with experimental results from full-size tests of steel pipes. Parametric study conducted as part of this paper indicates that the strain hardening effect has significant influence on the ultimate bending capacity of steel pipes. It is shown that pipe considering strain hardening yields higher bending capacity than that of pipe assumed as elastic-perfectly plastic material. Thus, the ignorance of strain hardening effect, as commonly assumed in current codes, may underestimate the ultimate bending capacity of steel pipes. The solutions proposed in this paper are applicable in the design of offshore/onshore steel pipes, supports of offshore platforms and other tubular structural steel members.

  2. MICROSTRUCTURAL CHARACTERIZATION OF PRIMARY COOLANT PIPE STEEL

    OpenAIRE

    Miller, M; Bentley, J.

    1986-01-01

    Atom probe field-ion microscopy, analytical electron microscopy, and optical microscopy have been used to investigate the changes that occur in the microstructure of cast CF 8 primary coolant pipe stainless steel long term thermal aging. The cast duplex microstructure consisted of austenite with 15% δ-ferrite. Investigation of the aged material revealed that the ferrite spinodally decomposed into a fine scaled network of α and α'. A fine G-phase precipitate was also observed in the ferrite. T...

  3. Morbidity profile of steel pipe production workers

    Directory of Open Access Journals (Sweden)

    Pandit Kirti

    2008-01-01

    Full Text Available Objective: To study the different morbid conditions among steel pipe producing workers. Methods: The present cross-sectional study has been carried out among the workers of one of the steel pipes and tubes manufacturing factory of Gujarat. Hundred workers from the four major departments of the steel pipe production plant, namely welding, pressing machine, X-ray welding and loading/transportation department were covered. The information regarding demographic, occupational, clinical characteristics and diagnosis were recorded on a pre-designed proforma. Statistical analysis included calculation of percentages and proportions and was carried out using the statistical software Epi Info Version 3.3.2. Results: The mean age of the study subjects was found to be 38.7±7.1 years. The mean duration of exposure was found to be 9.0±3.4 years. Forty-four percent of the subjects had an upper respiratory tract infection, as evidenced by symptoms like dry cough, cough with rhinitis and cough with fever. Symptoms suggestive of allergic bronchitis were observed in 12% of the subjects while symptoms suggestive of heat stress such as prickly heat, dehydration, perspiration and pyrexia were observed in 13% of the subjects.

  4. Investigations on strength of piping for non-condensable gas combustion. Part 3. Estimation of fracture strain of steel pipes subjected to hydrogen-oxygen detonation

    International Nuclear Information System (INIS)

    To assess the integrity of piping under the detonation pressure of accumulated hydrogen-oxygen, the fracture strain of the pipe material must be identified. In carbon steel pipe specimens that had been experimentally ruptured by hydrogen-oxygen detonation, the strain rate of the measured hoop strains was around 2000 s-1. To obtain fracture strains at such a high strain rate, tensile tests were conducted at strain rates of up to 5000 s-1 using specimens cut from carbon steel pipes, low alloy steel pipes, and weld metals. For all the different strain rates and materials, elongation was over 24% and dimple patterns were found in the fracture surfaces. From this, it is apparent that the fracture mode of piping material subjected to a high-speed tensile load is ductile fracture. We had previously measured the strain history of the carbon steel pipe specimens ruptured by hydrogen-oxygen detonation, but we had not measured a strain higher than about 14% because of the limitations of strain gauge measurement. FEM analyses of the ruptured pipe specimens were conducted to estimate the fracture strain at pipe rupture. We estimated that the strain at the pipe rupture was 20 - 22%. The results of the material tensile tests and the estimated fracture strains of the pipe specimens revealed that steel pipes have sufficient ductility even if they are subjected to detonation pressure. Because pipe rupture is accompanied by large strains, we propose a method for assessing the integrity of a pipe subjected to detonation pressure by comparing the strain on a pipe estimated by FEM and the limiting strain of the pipe material. We propose a limiting strain of 8%, which is reduced to one-third of the minimum elongation in material tensile tests in order to ensure a sufficient safety margin. (author)

  5. 77 FR 72818 - Circular Welded Carbon Steel Pipes and Tubes From Turkey; Final Results of Antidumping Duty...

    Science.gov (United States)

    2012-12-06

    ... Standard Pipe and Tube Products From Turkey, 51 FR 17784, 17784 (May 15, 1986). Notification to Importers... Turkey: Notice of Preliminary Results of Antidumping Duty Administrative Review, 77 FR 32508 (June 1...\\ \\3\\ See id., 77 FR at 32510. \\4\\ See id., 77 FR at 32512. On October 23, 2012, the Department...

  6. 75 FR 23672 - Certain Welded Carbon Steel Standard Pipes and Tubes from India: Extension of Time Limit for...

    Science.gov (United States)

    2010-05-04

    ... Pipes and Tubes from India, 51 FR 17384 (May 12, 1986). On June 24, 2009, the Department published a..., 74 FR 30052 (June 24, 2009). The period of review is May 1, 2008, through April 30, 2009. On December... Results of Antidumping Duty Administrative Review, 74 FR 68586 (December 28, 2009). In accordance ]...

  7. 49 CFR 192.315 - Wrinkle bends in steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Wrinkle bends in steel pipe. 192.315 Section 192... Transmission Lines and Mains § 192.315 Wrinkle bends in steel pipe. (a) A wrinkle bend may not be made on steel pipe to be operated at a pressure that produces a hoop stress of 30 percent, or more, of SMYS. (b)...

  8. 76 FR 76944 - Circular Welded Carbon Quality Steel Pipe From the People's Republic of China: Rescission of the...

    Science.gov (United States)

    2011-12-09

    ... Order, Finding, or Suspended Investigation; Opportunity To Request Administrative Review, 76 FR 38609... Reviews and Requests for Revocation in Part, 76 FR 53404 (August 26, 2011). In a letter dated November 22... Zhongyou TIPO''), Sichuan YNJ Industries Co., Ltd. (``Sichuan YNJ''), SteelFORCE Far East Ltd....

  9. Amorphous diffusion bonding of steel pipe and its impact toughness

    Institute of Scientific and Technical Information of China (English)

    WANG Xuegang; YAN Fengjie; YAN Qian; LI Xingeng

    2007-01-01

    An iron-based amorphous foil (FeNiCrSiB) was used as an interlayer for the amorphous diffusion bonding of low carbon steel pipes under argon flux. The microstructure and mechanical properties of the joint were analyzed using an electron probe micro-analyzer (EPMA), tensile test, bending test and impact test. The results show that the joint micro-structure resembles that of the base metal and no precipitates form at the joint. Melting point depressants 03, Si) diffuse far away from the joint and the base metal element is homoge-nous across the joint. The joint impact toughness is greater than the base metal toughness and the mechanical properties of the joint are similar around the pipe.

  10. Austenitic steel piping testing exercises in PISC

    International Nuclear Information System (INIS)

    In this paper capability and reliability studies of NDT procedures for the inspection of wrought and cast stainless steel piping used in nuclear power plants will be presented. The capability study was designed to identify procedures that have the potential to detect and size defects and to discriminate between flawed and unflawed material. The reliability study was undertaken to quantify on real and realistic flaws in-service inspection performance (detection and false call capability) under realistic field conditions. Furthermore parametric studes were performed to complement the capability and reliability studies by evaluating the effect of important material and flaw variables.The specimens used in these studies were cast-to-cast, cast-to-wrought, and wrought-to-wrought pipework welds. The evaluation methods used to quantify the inspection performance were selected to be as comparable as possible to the PISC II methods. These were adapted to allow also the evaluation of the effect of false calls. During the PISC II screening exercise for the cast-to-cast stainless steel round robin test and other piping round robin studies, it was indeed found that false call probabilities were large and could not be ignored in the evaluation of the inspection performance. The matrix of samples has also been designed to allow the implementation of specific statistical analysis procedures for the evaluation of results such as for example the relative operative characteristics analysis. (orig.)

  11. Crack stability analysis of low alloy steel primary coolant pipe

    Energy Technology Data Exchange (ETDEWEB)

    Tanaka, T.; Kameyama, M. [Kansai Electric Power Company, Osaka (Japan); Urabe, Y. [Mitsubishi Heavy Industries, Ltd., Takasago (Japan)] [and others

    1997-04-01

    At present, cast duplex stainless steel has been used for the primary coolant piping of PWRs in Japan and joints of dissimilar material have been applied for welding to reactor vessels and steam generators. For the primary coolant piping of the next APWR plants, application of low alloy steel that results in designing main loops with the same material is being studied. It means that there is no need to weld low alloy steel with stainless steel and that makes it possible to reduce the welding length. Attenuation of Ultra Sonic Wave Intensity is lower for low alloy steel than for stainless steel and they have advantageous inspection characteristics. In addition to that, the thermal expansion rate is smaller for low alloy steel than for stainless steel. In consideration of the above features of low alloy steel, the overall reliability of primary coolant piping is expected to be improved. Therefore, for the evaluation of crack stability of low alloy steel piping to be applied for primary loops, elastic-plastic future mechanics analysis was performed by means of a three-dimensioned FEM. The evaluation results for the low alloy steel pipings show that cracks will not grow into unstable fractures under maximum design load conditions, even when such a circumferential crack is assumed to be 6 times the size of the wall thickness.

  12. EXTRUSION DIE CAE OF THE STEEL REINFORCED PLASTIC PIPE

    Institute of Scientific and Technical Information of China (English)

    W.Q. Ma; H.Y. Sun; D.C. Kang; K.D. Zhao

    2004-01-01

    The steel reinforced plastic pipe is a new kind of pressure pipe. It is made up with steel wires and plastic. Because reinforced skeleton of the steel wire increase the complexity of plastic flow during the extrusion phase, the traditional design criteria of extrusion die is not suitable. The study on extrusion die of the kind of pipe is very important step in produce development. Using finite element (FE) method in this paper, the flow rule of molten plastic inside the die has been predicted and a group of optimal structural parameters was obtained. These results are helpful for reducing the design cycle and improve the quality of the final product.

  13. Analyses of magnetic field in spiral steel pipe

    International Nuclear Information System (INIS)

    In order to confirm the feasibility of identifying the girth welds using the magnetic field in spiral pipelines, the distributions of the magnetic field in spiral steel pipes with different sizes and different magnetizations were analyzed using the equivalent magnetic charge method, and were verified experimentally. The magnetic field inside spiral steel pipes is generally uniform with very small magnetic sudden changes at the spiral welds, whereas the magnetic field near the pipe ends has very big local changes. The size of spiral pipes, including its wall thickness, length, diameter, and the lift-off, has various influences on the local magnetic sudden changes at the spiral welds (LMASW) and the magnetic incremental near the pipe ends (MINPE), whereas the difference between LMASW and MINPE is always quite considerable. The bigger the radial magnetization component is, the bigger the difference between LMASW and MINPE is. When the radial magnetization component is small, changes of the circumferential and axial magnetization components can reduce this difference. Since the magnetizations of each pipe are seldom identical, the magnetic field inside each pipe is usually quite different. Thus there will be a big local magnetic sudden change at the girth weld inside the spiral pipeline, and this sudden change is much stronger than LMASW. Therefore, we can still consider identifying the girth welds using the magnetic field in spiral pipelines to improve the positioning accuracy of the in-pipe detector. - Highlights: • An analyzing method of the magnetic field in spiral steel pipe is proposed. • Magnetic field in spiral steel pipe was analyzed and verified experimentally. • Magnetic sudden change near pipe end is much bigger than that near spiral weld. • We can identify girth weld using this sudden change to locate in-pipe detector

  14. A new welding technique for stainless steel pipe butt welds

    International Nuclear Information System (INIS)

    A modified TIG welding process which uses an accurately machined consumable weld socket ring for aligning pipes and providing filler material has been developed by British Nuclear Fuels and used successfully at Windscale Site Construction. The technique and its practical application at Windscale for automatic orbital TIG welding of stainless steel pipe is described. (author)

  15. Ultrahigh carbon steels, Damascus steels, and superplasticity

    Energy Technology Data Exchange (ETDEWEB)

    Sherby, O.D. [Stanford Univ., CA (United States). Dept. of Materials Science and Engineering; Wadsworth, J. [Lawrence Livermore National Lab., CA (United States)

    1997-04-01

    The processing properties of ultrahigh carbon steels (UHCSs) have been studied at Stanford University over the past twenty years. These studies have shown that such steels (1 to 2.1% C) can be made superplastic at elevated temperature and can have remarkable mechanical properties at room temperature. It was the investigation of these UHCSs that eventually brought us to study the myths, magic, and metallurgy of ancient Damascus steels, which in fact, were also ultrahigh carbon steels. These steels were made in India as castings, known as wootz, possibly as far back as the time of Alexander the Great. The best swords are believed to have been forged in Persia from Indian wootz. This paper centers on recent work on superplastic UHCSs and on their relation to Damascus steels. 32 refs., 6 figs.

  16. 49 CFR 192.109 - Nominal wall thickness (t) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Nominal wall thickness (t) for steel pipe. 192.109... TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.109 Nominal wall thickness (t) for steel pipe. (a) If the nominal wall thickness for steel pipe is not...

  17. Finite element thermal analysis of the fusion welding of a P92 steel pipe

    OpenAIRE

    Yaghi, A. H.; Tanner, D. W. J.; Hyde, T.H.; A. A. Becker; Sun, W.

    2012-01-01

    Fusion welding is common in steel pipeline construction in fossil-fuel power generation plants. Steel pipes in service carry steam at high temperature and pressure, undergoing creep during years of service; their integrity is critical for the safe operation of a plant. The high-grade martensitic P92 steel is suitable for plant pipes for its enhanced creep strength. P92 steel pipes are usually joined together with a similar weld metal. Martensitic pipes are sometimes joined to austenitic steel...

  18. Thermoplastic liners for carbon steel pipelines

    Energy Technology Data Exchange (ETDEWEB)

    Mehdi, Mauyed S.; AlDossary, Abdullah K. [Saudi Aramco, Dhahran (Saudi Arabia)

    2009-12-19

    Materials selection for pipe and fittings used to convey corrosive fluids has often been a challenge. Traditionally, exotic Corrosion Resistant Alloys (CRA) have been used in corrosive environments despite their high cost. Plastic lined carbon steel piping offers a cost effective alternative to the use of CRAs by eliminating corrosion, significantly reducing the use of toxic chemicals and the heavy metal usually present in CRAs. Thermoplastic Liners offer the combination of corrosion resistance and mechanical strength, which are unachievable with singular materials. Under pressure conditions, the liner is fully supported by the metalwork, while under vacuum conditions, the liner must be thick enough along with venting system to withstand the collapsing forces created by the negative pressure. Plastic liners have been used successfully to line and protect metallic pipelines for many years and have become an indispensable requirement of the oil and gas industry particularly with water injection and hydrocarbon services. In the case of internally corroded pipes, the use of thermoplastic liners for rehabilitation is an option to extend the lifetime of companies' assets, reduce maintenance cost and increase intervals between T and Is. For new construction, plastic liners in carbon steel pipes can compete technically and economically with pipelines of CRA materials and other corrosion inhibition systems. This paper describes various design features, installations of thermoplastic liners in comparison to other corrosion inhibition methods. (author)

  19. Investigation on thermally aged cast duplex stainless steel piping

    International Nuclear Information System (INIS)

    In order to evaluate integrity of PWR primary coolant pipes, four-point bending test of cast duplex stainless steel pipe specimen had been conducted for seven years until March 2006. Materials testing of tensile properties and fracture toughness, and elastic-plastic analysis of crack growth of test pipe specimen were also performed. Simplified prediction curves of stress vs. strain and fracture toughness (J kJ/m2) of cast stainless steel were prepared for parameters of ferrite number, thermal aging temperature and period. Four-point bending test of pipe specimen with initial inner crack measured load vs. displacement and crack growth curve and showed fracture behavior. Plastic collapse occurred before thermal aging, and ductile crack growth due to thermal aging and tearing instability followed. Ductile crack growth behavior of thermally aged specimen was tested. Numerical analysis of test pipe specimen was performed to simulate ductile crack growth behavior based on obtained stress vs. strain curve and compared with J (kJ/m2) vs. crack depth (mm) curve in good conformity. Numerical analysis of full size pipe based on validated method of test specimen analysis was performed to establish database of J (kJ/m2) for evaluation of thermally aged cast stainless steel piping (T. Tanaka)

  20. A simplified LBB evaluation procedure for austenitic and ferritic steel piping

    International Nuclear Information System (INIS)

    The NRC previously has approved application of LBB analysis as a means to demonstrate that the probability of pipe rupture was extremely low so that dynamic loads associated with postulated pipe break could be excluded from the design basis (1). The purpose of this work was to: (1) define simplified procedures that can be used by the NRC to compute allowable lengths for circumferential throughwall cracks and assess margin against pipe fracture, and (2) verify the accuracy of the simplified procedures by comparison with available experimental data for piping having circumferential throughwall flaws. The development of the procedures was performed using techniques similar to those employed to develop ASME Code flaw evaluation procedures. The procedures described in this report are applicable to pipe and pipe fittings with: (1) wrought austenitic steel (Ni-Cr-Fe alloy) having a specified minimum yield strength less than 45 ksi, and gas metal-arc, submerged arc and shielded metal-arc austentic welds, and (2) seamless or welded wrought carbon steel having a minimum yield strength not greater than 40 ksi, and associated weld materials. The procedures can be used for cast austenitic steel when adequate information is available to place the cast material toughness into one of the categories identified later in this report for austenitic wrought and weld materials

  1. A simplified LBB evaluation procedure for austenitic and ferritic steel piping

    Energy Technology Data Exchange (ETDEWEB)

    Gamble, R.M.; Wichman, K.R.

    1997-04-01

    The NRC previously has approved application of LBB analysis as a means to demonstrate that the probability of pipe rupture was extremely low so that dynamic loads associated with postulated pipe break could be excluded from the design basis (1). The purpose of this work was to: (1) define simplified procedures that can be used by the NRC to compute allowable lengths for circumferential throughwall cracks and assess margin against pipe fracture, and (2) verify the accuracy of the simplified procedures by comparison with available experimental data for piping having circumferential throughwall flaws. The development of the procedures was performed using techniques similar to those employed to develop ASME Code flaw evaluation procedures. The procedures described in this report are applicable to pipe and pipe fittings with: (1) wrought austenitic steel (Ni-Cr-Fe alloy) having a specified minimum yield strength less than 45 ksi, and gas metal-arc, submerged arc and shielded metal-arc austentic welds, and (2) seamless or welded wrought carbon steel having a minimum yield strength not greater than 40 ksi, and associated weld materials. The procedures can be used for cast austenitic steel when adequate information is available to place the cast material toughness into one of the categories identified later in this report for austenitic wrought and weld materials.

  2. The thermal and mechanical behaviour of structural steel piping systems

    OpenAIRE

    Fonseca, E.M.M.; F. J. M. Q. de Melo; Oliveira, C.A.M de

    2005-01-01

    The temperature, the deformation and the stress field in thermo-mechanical problems play a very important role in engineering applications. This paper presents a finite element algorithm developed to perform the thermal and mechanical analysis of structural steel piping systems subjected to elevated temperatures. The new pipe element with 22 degrees of freedom has a displacement field that results from the superposition of a beam displacement, with the displacement field associated w...

  3. Denting of coated and uncoated offshore steel pipes

    OpenAIRE

    Holm, Nicolay Line; Røshol, Eivind Torgunrud

    2015-01-01

    In the present thesis, numerical and experimental investigations of coated offshore pipelines were conducted. The objective was to investigate how the polypropylene coating affected the global response of the pipes. The present work was a continuation of previous theses done on X65 steel pipes without coating, and part of an ongoing research program between SIMLab (NTNU) and Statoil. The experimental work consisted of material testing and component tests. A tensile test of the X6...

  4. Investigation on ductile fracture behavior of 3-inch diameter Type 304 stainless steel pipe with a circumferential through-wall crack

    International Nuclear Information System (INIS)

    At Japan Atomic Energy Research Institute (JAERI), a pipe fracture test program has been conducted as a part of the Leak-Before-Break (LBB) verification research in LWR pressure boundary pipings. In this program, fracture behavior and fracture criteria of the circumferentially cracked pipe have been investigated, using austenitic stainless steel pipes and carbon steel pipes. This report presents a four-point bending test results of 3-inch diameter Type 304 austenitic stainless steel pipes with circumferential through-wall crack at room temperature. Pipe fracture data were obtained from the test in regard to load-loadline displacement, crack extension, crack opening area, and so on. Discussions are performed on the effect of pipe ovalization ratio at maximum load, the application of the net-section collapse criterion, and the effect of initial crack angle, wall-thickness etc. on J-R curve. Furthermore, the crack opening area was estimated by assuming a simple crack model. (author)

  5. Residual stress measurement in 304 stainless steel weld overlay pipes

    International Nuclear Information System (INIS)

    Welding overlay repair (WOR) is commonly employed to rebuild piping systems suffering from intergranular stress corrosion cracking (IGSCC). To understand the effects of this repair, it is necessary to investigate the distribution of residual stresses in the welding pipe. The overlay welding technique must induce compressive residual stress at the inner surface of the welded pipe to prevent IGSCC. To understand the bulk residual stress distribution, the stress profile as a function of location within wall is examined. In this study the full destructive residual stress measurement technique -- a cutting and sectioning method -- is used to determine the residual stress distribution. The sample is type 304 stainless steel weld overlay pipe with an outside diameter of 267 mm. A pipe segment is cut from the circular pipe; then a thin layer is removed axially from the inner to the outer surfaces until further sectioning is impractical. The total residual stress is calculated by adding the stress relieved by cutting the section away to the stress relieved by axially sectioning. The axial and hoop residual stresses are compressive at the inner surface of the weld overlay pipe. Compressive stress exists not only at the surface but is also distributed over most of the pipe's cross section. On the one hand, the maximum compressive hoop residual stress appears at the pipe's inner surface. The thermal-mechanical induced crack closure from significant compressive residual stress is discussed. This crack closure can thus prevent IGSCC very effectively

  6. Characterization of modified 9 Cr-1 Mo steel extruded pipe

    International Nuclear Information System (INIS)

    The fabrication of hot-extruded pipe of modified 9 Cr-1 Mo steel at Cameron Iron Works is described. The report also deals with the tempering response; tensile, Charpy impact, and creep properties; and microstructure of the hot-extruded pipe. The tensile properties of the pipe are compared with the average and average -1.65 standard error of estimate curves for various product forms of several commercial heats of this alloy. The creep-rupture properties are compared with the average curve for various product forms of the commercial heats

  7. 49 CFR 192.107 - Yield strength (S) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Yield strength (S) for steel pipe. 192.107 Section... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.107 Yield strength (S) for steel pipe. (a) For pipe that is manufactured in accordance with a specification listed...

  8. Bending of X65 Offshore Steel Pipes

    OpenAIRE

    Lofthaug, Kristoffer; Digerud, Erik

    2014-01-01

    This thesis is part of an ongoing research program between SIMLab and Statoil about impact loads on X65 offshore pipelines and it is a continuation of previous work.Offshore pipelines are frequently impacted by accidental loads, e.g. trawl gear or anchors. Such loads may cause severe damage to the pipe and a complex stress-strain history locally in the impacted area.Fracture have previously been found in pipes dynamically impacted. Quasi-static bending of similar pipes with the same boundary ...

  9. 75 FR 53714 - Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan

    Science.gov (United States)

    2010-09-01

    ... imports of stainless steel butt-weld pipe fittings from Japan (53 FR 9787). On February 23, 1993, Commerce issued an antidumping duty order on imports of stainless steel butt-weld pipe fittings from Korea (58 FR... on imports of stainless steel butt-weld pipe fittings from Japan, Korea, and Taiwan (65 FR...

  10. History of ultrahigh carbon steels

    Energy Technology Data Exchange (ETDEWEB)

    Wadsworth, J.; Sherby, O.D.

    1997-06-20

    The history and development of ultrahigh carbon steels (i.e., steels containing between 1 and 2.l percent C and now known as UHCS) are described. The early use of steel compositions containing carbon contents above the eutectoid level is found in ancient weapons from around the world. For example, both Damascus and Japanese sword steels are hypereutectoid steels. Their manufacture and processing is of interest in understanding the role of carbon content in the development of modern steels. Although sporadic examples of UHCS compositions are found in steels examined in the early part of this century, it was not until the mid-1970s that the modern study began. This study had its origin in the development of superplastic behavior in steels and the recognition that increasing the carbon content was of importance in developing that property. The compositions that were optimal for superplasticity involved the development of steels that contained higher carbon contents than conventional modern steels. It was discovered, however, that the room temperature properties of these compositions were of interest in their own right. Following this discovery, a period of intense work began on understanding their manufacture, processing, and properties for both superplastic forming and room temperature applications. The development of superplastic cast irons and iron carbides, as well as those of laminated composites containing UHCS, was an important part of this history.

  11. Low carbon manganese-nickel-niobium steel

    International Nuclear Information System (INIS)

    Experimental heats of a low carbon-manganese-0.5% nickel-0.15% niobium steel have been rolled to plates between 13.5 and 50 mm thickness and to a 16 mm hot strip. Various combinations of soaking temperatures form 11000C to 13000C and of finish rolling temperatures between 7100C and 9300C have been investigated. From mechanical properties obtained, one can conclude that the investigated steel composition provides very good properties e.g. for pipe steels X65 to X75. In particular, the toughness at low temperature is outstanding despite relaxed rolling conditions. Metalographic and special investigations such as electron microscopy, texture evaluation and chemical extraction, correlated with applied rolling schedules and the mechanical properties obtained resulted in a comprehensive understanding about the benefits of high niobium metallurgy combined with nickel addition. All practically applied welding processes generated mechanical properties, in particular toughness of the weldment, that meet arctic specifications.(Author)

  12. Fracture behavior evaluations for ferritic steel piping with circumferential double flaws on the inner surface

    International Nuclear Information System (INIS)

    Methods for assessing the structural integrity of nuclear components having some flaws are provided in the Rules on Fitness-for-Service for Nuclear Power Plants of the JSME code (JSME FFS code). Although the JSME FFS code provides such methods for piping with a single flaw, it does not describe any method for fracture assessment of piping with multiple flaws including flaw coalescence criteria. Some investigations on the fracture behavior of mainly austenitic stainless steel piping with multiple flaws, whose fracture mode is plastic collapse, have recently been reported and fracture assessment methods have been proposed. In the present study, fracture tests and analyses of carbon steel piping with a single and two circumferential flaw(s) on the inner surface were conducted to investigate a method for fracture assessment of ferritic steel piping with multiple flaws. It was found that fracture assessment based on the twice elastic slope method and the plastic collapse mechanism gave inadequate results for a large single flaw. Including this case, two kinds of elastic–plastic fracture assessment method, one using the Z-factor in the JSME FFS code and the other by ductile instability analysis, gave conservative estimates of fracture strength even when the structural factor SF was not considered (i.e. SF = 1)

  13. Microbiologically influenced corrosion of stainless steel tubing and piping in the service water system at North Anna Nuclear Power Station

    International Nuclear Information System (INIS)

    Since original plant construction in the 1970's, the carbon steel piping of the service water system (SWS) of Virginia Power's North Anna Nuclear Power Station has experienced general corrosion and pitting due to microbiologically influenced corrosion (MIC). Corrosion of the carbon steel piping was combatted by the implementation of chemical treatment of the SWS and by repair/replacement of portions of the piping utilizing type 316L stainless steel (SS) on 10 in. and smaller piping and 100% solids epoxy coating on the rest of the piping. Only recently, in early 1994, MIC was discovered on the 18 gage 304 S welded tubes in the Component Cooling Heat Exchangers (CCHXs). Earlier, MIC was discovered on 316L SS pipe base metal adjacent to several socket weld locations on small diameter piping. This paper will concentrate on the Virginia Power action plan to combat further degradation due to MIC and to maintain operable SS piping and equipment with SS tubing which is exposed to service water

  14. Visual alignment technology for seamless steel pipe linearity measurement

    Science.gov (United States)

    Wu, Bin; Xue, Ting; Zhu, Jigui; Ye, Shenghua

    2006-06-01

    Linearity measurement is the key problem in seamless steel pipe industry. For the modern industry of seamless steel pipe production, the traditional method cannot meet the needs of on-line and real-time measurement performance. Recently, visual inspection has developed rapidly and has the advantages of high speed, high precision, non-contact, automation and high manoeuvrability. So a novel approach to on-line and real-time linearity measurement of seamless steel pipe based on visual alignment technology is presented in this paper. Firstly the theory of visual alignment measuring is introduced. And then an on-line and real-time linearity measuring system, which consists of multistructured light sensor for seamless steel pipe factory of Tianjin, is invented with the technology of visual alignment. And key technologies for a visual alignment, such as the optimum design of high precision light-structured sensor, coordinates integration of multisensor, the mathematical model of visual measurement, and algorithm for ellipse center computations with high precision are studied in detail. Measurement results show that the measuring system is reasonable and can measure not only the linearity but also the coaxiality of large-scale parts.

  15. SCC-induced failure of a 304 stainless steel pipe

    International Nuclear Information System (INIS)

    On 1991 January 12, a 304 Stainless Steel (SS) suction line in the AECL-Research NRU reactor failed, shutting down the reactor for approximately 12 months. The pipe, a 32 mm schedule 40 304 stainless steel line exposed to D2O at temperatures ≤35 degrees C had been in service for approximately 20 years, although no manufacturing data or composition specifications were available. The failure and resultant leak resulted in a small loss of D2O moderator from the reactor vessel. The pipe cracked approximately 180 degrees C around the circumference of a weld. This failure was unexpected and hense a thorough metallographic examination was carried out on the failed section, on the rest of the line (Line 1212), and on representative samples from the rest of the reactor in order to assess the integrity of the remaining piping

  16. Loading rate effects on strength and fracture toughness of pipe steels used in Task 1 of the IPIRG program

    International Nuclear Information System (INIS)

    Material characterization tests were conducted on laboratory specimens machined from pipes to determine the effect of dynamic loading (i.e., rates comparable to those for high amplitude seismic events) on tensile properties and fracture resistance at 288 C (550 F). Specimens were fabricated from seven different pipes, including carbon steels and stainless steels (both base metal and weld metal), which were to be subjected to full-scale pipe tests in IPIRG Task 1.0. For the stainless steels tested at 288 C (550 F), tensile strength was unchanged, while yield strength and fracture resistance were increased. The increase in fracture resistance was modest for the wrought base metals and substantial for the weld metal and the cast base metal. The carbon steels tested were sensitive to dynamic strain aging, and hence the strength and toughness was affected by both temperature and strain rate effects. The carbon steel base metal and welds exhibited ultimate tensile strength values at 288 C (550 F) that were greater than at room temperature. Furthermore, the ultimate tensile strength at 288 C (550 F) was lowered significantly by increased strain rate and, in the carbon steel base metals, increased strain rate also lowered the fracture resistance, substantially in the base metal of one pipe. In comparing these results to the IPIRG pipe test results to date, it was found that the trends of these tests agree well with the Subtask 1.2 quasi-static and dynamic pipe fracture experiments. Loads measured in the Subtask 1.1 pipe experiments were, however, somewhat higher than would have been expected by the trends observed in the laboratory tests

  17. The current situation and prospect of oil steel pipe in China

    Institute of Scientific and Technical Information of China (English)

    LI; He-lin; JI; Ling-kang; XIE; Li-hua

    2005-01-01

    The oil steel pipe in the petroleum industry is very important for its high price, large consumption volume and great effect on thedevelopment of petroleum industry. The oil steel pipe mainly includes oil well pipe (drill pipe, drill collar, casing and tubing etc. ) and oil-gas transportation pipe. This paper is an attempt to make a comprehensive review on the current situation and prospect of the oil steel pipe in China, presenting the past , today and future of the China oil pipe.The first section is a historical review of the China oil pipe. The developing course and progress of the oil steel pipe products are presented. The second section is about the current situation of the China oil pipe. The general situation of the China's steel pipe corporation and their products types,capability, etc. is introduced. The third section is about the prospect of the China oil pipe. This part mainly describes the new product research and development in China steel pipe corporations,which are facing more and more strict technical requirements of the petroleum industry in oil pipe,and reveals the prosperity of China's steel pipe corporations.

  18. Collapse and post-collapse behavior of steel pipes

    International Nuclear Information System (INIS)

    Full text: Steel pipes under external pressure plus bending may reach their load carrying capacity due to two failure modes: (i)global buckling: in this case the pipe structure buckles in a 'column mode'; (ii) localized collapse: in this case the pipe structure collapses with its sections loosing their round shape. In many engineering applications such as the design of pressure vessels or the design of marine pipe lines it is very important to be able to determine the collapse pressure of steel pipes subjected to external pressure and bending; besides it is very important to also be able to quantify the effect of imperfections such as ovality, eccentricity or residual stresses on the collapse pressure. The determination of the post-collapse equilibrium paths is also very important in order to be able to assess on the stability of the post-collapse regime; that is to say in order to assess if a collapse will be localized in a section or will propagate along the tubular structure. It is also important in this case to analyze the effect of the imperfections on the post-collapse regime. In a previous publication we presented finite element models that we developed for studying the influence of the above described imperfections on the collapse behavior of steel pipes under external pressure; in that publication we also presented the experimental qualification of the numerical models. Our purpose in the present paper is to extend the study to the post-collapse regime and to the loading case of external pressure plus bending. We present the finite element models developed using shell elements, we discuss the validation of those models and then we use the validated models to perform parametric studies in order to investigate the significance of the different imperfections in load cases that combine external pressure with different degrees of bending. Refs. 3 (author)

  19. 49 CFR 192.111 - Design factor (F) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Design factor (F) for steel pipe. 192.111 Section... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.111 Design factor (F) for steel pipe. (a) Except as otherwise provided in paragraphs (b), (c), and (d) of this section,...

  20. 49 CFR 192.113 - Longitudinal joint factor (E) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Longitudinal joint factor (E) for steel pipe. 192... SAFETY TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.113 Longitudinal joint factor (E) for steel pipe. The longitudinal joint factor to be used in...

  1. Research & Development of Grade X70 LSAW Steel Pipes for West-East Gas Pipeline

    Institute of Scientific and Technical Information of China (English)

    WangXiaoxiang; SunQi

    2004-01-01

    In this article the research and development of X70 large diameter longitudinal seam submerged arc welded (LSAW) steel pipes for West-East Gas Transportation Pipeline project (WEGTP) in China are introduced, including the key technique, fabrication of pipe production line, mass production and the latest progress of LSAW steel pipe technique.

  2. Fatigue crack growth in austenitic stainless steel piping

    International Nuclear Information System (INIS)

    The study presented in this paper is being carried out with a view to substantiating the calculations of the fatigue crack growth in pipes made of 316 L stainless steel. The results obtained may be applied to P.W.R. primary piping. It is divided into two parts. First, fatigue tests (cyclic pressure) are carried out under hot and cold conditions with straight pipes machined with notches of various dimensions. The crack propagation and the fatigue crack growth rate are measured here. Second, calculations are made in order to interpret experimental results. From elastic calculations the stress intensity factor is assessed to predict the crack growth rate. The results obtained until now and presented in this paper relate to longitudinal notches

  3. Fracture properties evaluation of stainless steel piping for LBB applications

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Y.J.; Seok, C.S.; Chang, Y.S. [Sung Kyun Kwan Univ., Suwon (Korea, Republic of)

    1997-04-01

    The objective of this paper is to evaluate the material properties of SA312 TP316 and SA312 TP304 stainless steels and their associated welds manufactured for shutdown cooling line and safety injection line of nuclear generating stations. A total of 82 tensile tests and 58 fracture toughness tests on specimens taken from actual pipes were performed and the effect of various parameters such as the pipe size, the specimen orientation, the test temperature and the welding procedure on the material properties are discussed. Test results show that the effect of the test temperature on the fracture toughness was significant while the effects of the pipe size and the specimen orientation on the fracture toughness were negligible. The material properties of the GTAW weld metal was in general higher than those of the base metal.

  4. Piping systems, containment pre-stressing and steel ventilation chimney

    International Nuclear Information System (INIS)

    Units 5 and 6 of NPP Kozloduy have been designed initially for seismic levels which are considered too low today. In the frame of an IAEA Coordinated Research Programme, a Swiss team has been commissioned by Natsionalna Elektricheska Kompania, Sofia, to analyse the relevant piping system, the containment prestressing and the steel ventilation chimney and to recommend upgrade measures for adequate seismic capacity where applicable. Seismic input had been specified by and agreed upon earlier by IAEA experts. The necessary investigations have been performed in 1995 and discussed with internationally recognized experts. The main results may be summarized as follows: Upgrades are necessary at different piping sy ports (additional snubbers or viscous dampers). These fixes can be done easily at low cost. The containment prestressing tendons are adequately designed for the specified load combinations. However, unfavourable construction features endanger the reliability. It is therefore strongly recommended to replace the tendons stepwise and to upgrade the existing monitoring system. Finally, the steel ventilation chimney may not withstand a seismic event, however the containment and diesel generator building will not be destroyed at possible impact by the chimney. On the other hand the roof of the main building has to be reinforced partially. It is recommended to continue the project for 1996 and 1997 to implement the upgrade measures mentioned above, to analyse the remaining piping systems and to consolidate all results obtained by different research groups of the IAEA programme with respect to piping systems including components and tanks

  5. Study on Domestication of Ultra-Supercritical P92 Steel Pipe Fittings

    Institute of Scientific and Technical Information of China (English)

    Cong Xiangzhou; Xu Guangxin; Wei Xiao; An Jinping; Peng Xiankuan; Hui Na; Ye Qing

    2007-01-01

    @@ P92 steel pipe fittings are key components for domestic ultra-supercritical power units.Although under booming development in some countries,presently only a few foreign units under commercial operation are using P92 steel and the experience on fabrication and operation of P92 steel pipe fittings is insufficient.

  6. 76 FR 64106 - Certain Welded Stainless Steel Pipe From Korea and Taiwan; Scheduling of Expedited Five-Year...

    Science.gov (United States)

    2011-10-17

    ... COMMISSION Certain Welded Stainless Steel Pipe From Korea and Taiwan; Scheduling of Expedited Five-Year Reviews Concerning the Antidumping Duty Orders on Certain Welded Stainless Steel Pipe From Korea and... duty orders on certain welded stainless steel pipe (specifically ASTM A-312 pipe) from Korea and...

  7. Fracture toughness evaluations of TP304 stainless steel pipes

    International Nuclear Information System (INIS)

    In the IPIRG-1 program, the J-R curve calculated for a 16-inch nominal diameter, Schedule 100 TP304 stainless steel (DP2-A8) surface-cracked pipe experiment (Experiment 1.3-3) was considerably lower than the quasi-static, monotonic J-R curve calculated from a C(T) specimen (A8-12a). The results from several related investigations conducted to determine the cause of the observed toughness difference are: (1) chemical analyses on sections of Pipe DP2-A8 from several surface-cracked pipe and material property specimen fracture surfaces indicate that there are two distinct heats of material within Pipe DP2-A8 that differ in chemical composition; (2) SEN(T) specimen experimental results indicate that the toughness of a surface-cracked specimen is highly dependent on the depth of the initial crack, in addition, the J-R curves from the SEN(T) specimens closely match the J-R curve from the surface-cracked pipe experiment; (3) C(T) experimental results suggest that there is a large difference in the quasi-static, monotonic toughness between the two heats of DP2-A8, as well as a toughness degradation in the lower toughness heat of material (DP2-A8II) when loaded with a dynamic, cyclic (R = -0.3) loading history

  8. Eddy current testing of longitudinal welds in austenitic steel pipes

    International Nuclear Information System (INIS)

    The existing steel-iron test sheet 1914 'Nondestructive Testing of Fusion Welded Joints in Tubes of Stainless Steels' (SEP 1914) had to be revised. The physical correlation between test frequency, phase position, amplitude and defect size for different pipe dimensions were pointed out and discussed on the basis of numerous measurement series. The influence of coil-specific parameters, filtration and electromagnetic magnetization on the eddy current signal were clarified. Additionally, the transferability of the amplitude and phase behaviour of simulated defects on naturally occurring defects was investigated in order to guarantee that the determined test parameters for the revision of existing test regulations are practice-oriented. As the most important result, it is stated that the definition of the test sensitivity in the steel-iron test sheet 1914 is too insensitive for a great number of pipe dimensions. Therefore, the existing steel-iron test sheet 1914 was revised with regard to the definition of the test sensitivity on the basis of the required detection sensitivity of a 20% internal groove. (orig./HP)

  9. Latest developments in mechanical properties and metallurgical features of high strength line pipe steels

    OpenAIRE

    Belato Rosado, Diego; De Waele, Wim; Vanderschueren, Dirk; Hertelé, Stijn

    2013-01-01

    In response to the increasing demand to improve both transportation efficiency and performance, the steel pipe industry has conducted extensive efforts to develop line pipe steel grades with superior metallurgical and mechanical (strength, toughness and ductility) properties in order to allow exploitation in hostile environments. This paper aims to give an overview of recent developments of high strength pipe steel grades as API 5L X70 and beyond, providing a detailed understanding of the con...

  10. 77 FR 27428 - Certain Large Diameter Carbon and Alloy Seamless Standard, Line, and Pressure Pipe (Over 41/2

    Science.gov (United States)

    2012-05-10

    ...On March 5, 2012, the Department of Commerce (``Department'') published its preliminary results of the administrative review of the antidumping duty order on certain large diameter carbon and alloy seamless standard, line, and pressure pipe (over 4\\1/2\\ inches) from Japan. The review covers four manufacturers/exporters: JFE Steel Corporation (``JFE''); Nippon Steel Corporation (``Nippon'');......

  11. Residual stress simulation in thin and thick-walled stainless steel pipe welds including pipe diameter effects

    International Nuclear Information System (INIS)

    In this paper, residual stresses in welded components are discussed and a brief review of weld simulation is presented. The general methodology of the FE analysis methods used for welded sections of steel pipes is explained. FE analyses are performed for two axisymmetric butt welds in stainless steel pipes having a 4-pass or a 36-pass weld in a pipe with a wall thickness of 7.1 or 40.0 mm, respectively. In addition, more FE models with inside radius to wall thickness ratio ranging from 1 to 100 have been analysed to investigate the effect of pipe diameter on residual stresses. Residual axial and hoop stresses are plotted for the considered range of pipe diameters for the two simulated pipe wall thicknesses and the differences are discussed

  12. Corrosion resistance of stainless steel pipes in soil

    Energy Technology Data Exchange (ETDEWEB)

    Sjoegren, L.; Camitz, G. [Swerea KIMAB AB, Box 55970, SE-102 16 Stockholm (Sweden); Peultier, J.; Jacques, S.; Baudu, V.; Barrau, F.; Chareyre, B. [Industeel and ArcelorMittal R and D, 56 rue Clemenceau, BP19, FR-71201 le Creusot, Cedex (France); Bergquist, A. [Outokumpu Stainless AB, P.O. Box 74, SE-774 22 Avesta (Sweden); Pourbaix, A.; Carpentiers, P. [Belgian Centre for Corrosion Study, Avenue des Petits-Champs 4A, BE 1410 Waterloo (Belgium)

    2011-04-15

    To be able to give safe recommendations concerning the choice of suitable stainless steel grades for pipelines to be buried in various soil environments, a large research programme, including field exposures of test specimens buried in soil in Sweden and in France, has been performed. Resistance against external corrosion of austenitic, super austenitic, lean duplex, duplex and super duplex steel grades in soil has been investigated by laboratory tests and field exposures. The grades included have been screened according to their critical pitting-corrosion temperature and according to their time-to-re-passivation after the passive layer has been destroyed locally by scratching. The field exposures programme, being the core of the investigation, uses large specimens: 2 m pipes and plates, of different grades. The exposure has been performed to reveal effects of aeration cells, deposits or confined areas, welds and burial depth. Additionally, investigations of the tendency of stainless steel to corrode under the influence of alternating current (AC) have been performed, both in the laboratory and in the field. Recommendations for use of stainless steels under different soil conditions are given based on experimental results and on operating experiences of existing stainless steel pipelines in soil. (Copyright copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  13. Corrosion of carbon steel welds

    International Nuclear Information System (INIS)

    This report assesses the factors which cause preferential attack to occur in carbon steel fusion welds. It was concluded that the main factors were: the inclusion content of the weld metal, the potential of the weld metal being less noble than that of the parent, and the presence of low-temperature transformation products in the heat-affected zone of the weld. These factors should be minimized or eliminated as appropriate so that the corrosion allowances determined for carbon steel waste drums is also adequate for the welds. An experimental/theoretical approach is recommended to evaluate the relative corrosion resistance of welds prepared from BS 4360 grade 43A steel to that of the parent material. (author)

  14. Fatigue and fracture studies on stainless steel pipes and elbows

    International Nuclear Information System (INIS)

    In order to demonstrate Leak Before Break (LBB) design criterion and also have better understanding of the fatigue and fracture behaviour of piping components, detailed experimental investigations were carried out on straight pipes made of SA312 Type 304LN steel and elbows made of SA403 Type 304LN steel. Fatigue tests were carried out under constant amplitude cyclic loading on five pipes of 168 mm outer diameter having part through notch. The notch angle varied from 4.7° to 29.7° and notch depth varied from 3.4 mm to 3.6 mm. The notch length to depth ratio varied from 2.05 to 12.15. Four pipes had notch in the weld metal and one pipe had notch in the base metal. Fatigue crack growth during the tests was continuously monitored. It was observed that the number of cycles required for the crack to grow through thickness was significantly large compared to the cycles expected during the lifetime of the reactor. Fracture tests were subsequently conducted on the through wall cracked pipes under monotonic loading. Seven elbows were tested under cyclic loading out of which four elbows were of 168 mm OD and three elbows were of 324 mm OD. One elbow of 324 mm OD did not have any notch (healthy elbow) while the other elbows had a machined part-through notch on the outer surface at different locations namely crown, extrados and intrados. The notch was in the axial direction for crown while it was in the circumferential direction at extrados and intrados. The ratio of notch depth to thickness (a/t) varied from 0.20 to 0.28. The crack aspect ratio (a/2C) varied from 0.11 to 0.67 for the notched elbows. The notch angle varied from 1.6° to 17.7°. Fracture tests were subsequently conducted on the through-wall cracked elbows under monotonic loading. These studies provide valuable inputs which are essential to ensure structural safety and carry out life assessment and life extension studies of power plants. (author)

  15. Finite Element Based Multi-Scale Ductile Failure Simulation of Full-Scale Pipes with a Circumferential Crack in a Low Carbon Steel

    International Nuclear Information System (INIS)

    This paper describes multi-scale based ductile fracture simulation using finite element (FE) damage analysis. The maximum and crack initiation loads of cracked components were predicted using proposed virtual testing method. To apply the local approach criteria for ductile fracture, stress-modified fracture strain model was adopted as the damage criteria with modified calibration technique that only requires tensile and fracture toughness test data. Element-size-dependent critical damage model is also introduced to apply the proposed ductile fracture simulation to large-scale components. The results of the simulation were compared with those of the tests on SA333 Gr. 6 full-scale pipes at 288 .deg. C, performed by the Battelle Memorial Institute

  16. 75 FR 76025 - Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan

    Science.gov (United States)

    2010-12-07

    ... COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan AGENCY: United States... stainless steel butt-weld pipe fittings from Japan, Korea, and Taiwan would be likely to lead to... party responded to the sunset review notice of initiation by the applicable deadline * * *'' (75...

  17. 49 CFR 192.115 - Temperature derating factor (T) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Temperature derating factor (T) for steel pipe... § 192.115 Temperature derating factor (T) for steel pipe. The temperature derating factor to be used in the design formula in § 192.105 is determined as follows: Gas temperature in degrees...

  18. Explosive welding of transition pipes joint with zirconium alloy-stainless steel

    International Nuclear Information System (INIS)

    The explosive welding technology of two kinds of transition pipes joints with Zr-2 + stainless steel and Zr2.5Nb + stainless steel is researched. The mechanical properties and micro-structure in the bonding zone of the transition pipes joint produced by this welding technology are checked. It is seen that there are some micro-characteristics concerning the strength bonding between the welding metals in the bonding zone of transition pipes joint

  19. Carbon Segregation of Bearing Steel Concasting Billet

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The formation mechanism of “white band” and central carbon segregation of high-carbon Cr bearing steel concasting billets are discussed in this paper. The maximum oxygen content in the steel produced by concasting process was 13x10-6 with an average oxygen content of 9.3x 10-6.Comparison of metallurgical quality and fatigue property between the concasting steel (CC) andingot casting steel (IC) showed that the carbon segregation (C/C0) in former steel was 0.92~1.10and its fatigue life was equal to that of the latter steel.

  20. 77 FR 24459 - Stainless Steel Butt-Weld Pipe Fittings From Italy: Final Results of Antidumping Duty...

    Science.gov (United States)

    2012-04-24

    ... International Trade Administration Stainless Steel Butt-Weld Pipe Fittings From Italy: Final Results of... stainless steel butt-weld pipe fittings (SSBW pipe fittings) from Italy.\\1\\ This review covers two... results remain unchanged from the preliminary results of review. \\1\\ See Stainless Steel Butt-Weld...

  1. 75 FR 27987 - Certain Welded Stainless Steel Pipes From the Republic of Korea: Final Results of Antidumping...

    Science.gov (United States)

    2010-05-19

    ... Antidumping Duty Order: Certain Welded Stainless Steel Pipe From the Republic of Korea, 60 FR 10064, 10065... International Trade Administration Certain Welded Stainless Steel Pipes From the Republic of Korea: Final... welded stainless steel pipes (WSSP) from the Republic of Korea (Korea). This review covers one...

  2. 77 FR 42697 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines: Continuation...

    Science.gov (United States)

    2012-07-20

    ... Orders: Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines, 66 FR 11257... Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines, 77 FR 39735 (July 5, 2012), and... International Trade Administration Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and...

  3. 76 FR 36086 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results of Antidumping Duty...

    Science.gov (United States)

    2011-06-21

    ... Review: Certain Circular Welded Non-Alloy Steel Pipe and Tube from Mexico, 74 FR 41681 (August 18, 2009... Antidumping Duty Changed Circumstances Review: Certain Circular Welded Non-Alloy Steel Pipe from Mexico, 75 FR... Less Than Fair Value: Circular Welded Non- Alloy Steel Pipe From Mexico, 57 FR 42953 (September...

  4. NDE Assessments of Cast Stainless Steel Reactor Piping Components

    International Nuclear Information System (INIS)

    Studies conducted at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, have focused on developing and evaluating the effectiveness and reliability of novel NDE approaches for the inspection of coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the United States Nuclear Regulatory Commission (US NRC) on the utility, effectiveness and reliability of ultrasonic testing (UT) and eddy current testing (ET) inspection techniques as related to the in-service inspection of primary piping components in pressurized water reactors (PWRs). This paper describes recent developments and results from assessments of three different NDE approaches including an ultrasonic phased array inspection methodology, an eddy current testing technique and a low-frequency ultrasonic inspection methodology coupled with a synthetic aperture focusing technique (SAFT). Westinghouse Owner's Group (WOG) cast stainless steel pipe segments with thermal and mechanical fatigue cracks located close to the weld roots, were used for assessing the inspection methods. ET studies were conducted on the inner diameter (ID) surface of piping specimens while the ultrasonic inspection methods were performed from the outer diameter (OD) surface of the specimens. The ET technique employed a ZETEC MIZ-27SI Eddy Current instrument and a ZETEC Z0000857-1 cross point spot probe with an operating frequency of 250 kHz. On some samples where noise levels were high, degaussing of the sample resulted in significant improvements. The phased array approach was implemented using an RD Tech Tomoscan III system operating at 1 MHz and composite volumetric images of the samples were generated. The low-frequency ultrasonic method employs a zone-focused, multi-incident angle; inspection protocol (operating at 250-450 kHz) coupled with a synthetic aperture focusing technique (SAFT) for improved signal-to-noise and advanced imaging capabilities

  5. A Simulation Technology for a Full Cycle of Steel Line Pipe Manufacturing Operations

    OpenAIRE

    Vadim E. Seleznev; Viacheslav V. Kobyakov; Vladimir V. Aleshin

    2011-01-01

    At present day, pipe mill engineers have to deal with challenging technological problems of heavy-wall and high-strength line pipe manufacturing. Numerical analysis of welded large-diameter pipe manufacturing stages is the most efficient way to solve these problems. Corresponding computational technologies and applied software were developed at Physical & Technical Center. Numerical structural analysis of steel plates at various stages of line pipe manufacturing is performed by the finite ele...

  6. Testing corrosion rates on steel piping in geothermal district heating

    OpenAIRE

    İnce, Umut; Toksoy, Macit; Güden, Mustafa

    2008-01-01

    The corrosion behavior of St-37 pipeline carbon steel (CS) in a geothermal district heating system was tested at two different fluid velocities. An experimental set-up, directly connected the the end of the transmission line of a geothermal well, was used to assess the corrosion of St-37 steel tensile test coupons prepared in accordance with ASTM E8 in geothermal fluid. The geothermal fluid entered the set-up with a relatively low velocity, 0.02 m/s, and then injected into the well with a rel...

  7. Reeling of tight fit pipe

    OpenAIRE

    Focke, E.S.

    2007-01-01

    If it would be possible to install Tight Fit Pipe by means of reeling, it would be an attractive new option for the exploitation of offshore oil and gas fields containing corrosive hydrocarbons. Tight Fit Pipe is a mechanically bonded double walled pipe where a corrosion resistant alloy liner pipe is mechanically fitted inside a carbon steel outer pipe through a thermo-hydraulic manufacturing process. Reeling is a fast method of offshore pipeline installation where a pipe is spooled on a reel...

  8. Evaluation of SCC susceptibility in high temperature water for type 316 stainless steels cooling system pipes produced by forging

    International Nuclear Information System (INIS)

    For three kinds of nitrogen-charged 316 stainless steels pipes produced by forging, the stress corrosion cracking susceptibility and fundamental properties were investigated. (1) Fundamental properties of the materials were mainly as follows. Two kinds of 316LN forged stainless steels, whose carbon and nitrogen contents were 0.012%C - 0.130%N and 0.018%C - 0.133%N, showed extremely high resistance against intergranular corrosion, although they were severely sensitized by both furnace-heating and weld-heating. However, a relatively high carbon charged 316N stainless steel, whose carbon and nitrogen contents were 0.048%C and 0.139%N, showed very large intergranular attack when the material was heated in sensitizing temperature. All the tensile test properties of above materials at room temperature and 3000C, which included 0.2% offset proof stress, ultimate tensile strength, total elongation and reduction of area, satisfied the criteria of the nuclear-grade 316 stainless steel. (2) As follows was the SCC susceptibility in 2880C high purity water containing air-saturated dissolved oxygen (approximately 8 ppm). Severely sensitized 316N stainless steels exhibited no SCC susceptibility in all SCC tests which were constant extension rate test at minimum 4.2 x 10-7S-1 strain rate, cyclic tension test in the trapezoidal stress waveform of 2.25 σy upper holding stress, and constant load test at 2.25 σy applied stress. However a sensitized 316N stainless steel containing 0.048% carbon was failed by intergranular stress corrosion crackings. From above results, the 316LN stainless steels pipes were evaluated to be promising alternate materials when their carbon content was suppressed lower to approximately 0.2 weight percentage. However, the smaller grain size material has to be produced in the forging process. (author)

  9. Online machine vision method for measuring the diameter and straightness of seamless steel pipes

    Science.gov (United States)

    Sun, Changku; You, Qiang; Qiu, Yu; Ye, Shenghua

    2001-11-01

    We present a novel method to measure the diameter and straightness of seamless steel pipes. A pair of line-structured lasers, which locate on different sides of the pipe but are in a common plane, cast on the pipe to create two elliptical arcs. Two CCD cameras capture these two arcs. Major and minor axis radii and spatial 3D coordinates of every corresponding elliptical cross-section center can be calculated through ellipse fitting. A pair of line-structured laser sensors, each of which includes a line-structured laser and a CCD camera, are placed at every sampling cross section of the pipe, and thus the pipe's cross-section diameter and furthermore the straightness of the pipe can be solved. We provide an on-line machine vision method for measuring a seamless steel pipe's diameter and straightness, including the design of the system, the deduction of the mathematical model, and the research of the experimental results.

  10. Digitized system for the inspection of steel pipes

    Science.gov (United States)

    Comuzzi, Daniel; Monti, Fernando; Nicolini, Alberto; Stickar, Pablo

    2000-05-01

    We present an industrial software system named Cerbero, the main goal of which is to take advantage of the superior capabilities of digital signal processing techniques. Cerbero collects the signals generated by the transducers (coils), digitalizes them, and performs temporal and spectral analysis in order to identify defects in the magnetic flux leakage (MFL) inspection of seamless steel pipes. Faulty operating conditions are also identified. A friendly graphic user interface allows the users to tune the system to inspect the products in agreement with the clients' specifications. Currently, the system has been implemented in five units at the Siderca manufacturing plant, three of them aimed at the detection of longitudinal cracks, and two used for transverse cracks. In this paper we describe how the system was conceived, designed, and implemented. The system opens new challenges in signal processing applied to automated manufacturing that are also discussed.

  11. Nondestructive inspection technologies for low-carbon stainless steel

    International Nuclear Information System (INIS)

    This report summarized modification and additional items of 'ultrasonic testing guide for in-service inspection of light-water type nuclear power plant components' (JEAG4207-2004) for ultrasonic testing method for Primary Loop of Recirculation system (PLR) piping and core shrouds on the base of four year project on nondestructive inspection technologies for low-carbon stainless steel, which investigated defect detection capability and sizing accuracy for PLR piping and core shrouds, and their explanatory notes on ultrasonic testing method, indication length measurement, phased-array method and defect depth measurement for PLR piping, and indication length measurement and defect depth measurement for core shrouds. 'Eddy current testing guide using upper coil (draft)' for core shrouds was proposed with detailed explanatory notes. (T. Tanaka)

  12. 46 CFR 59.20-1 - Carbon-steel or alloy-steel castings.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Carbon-steel or alloy-steel castings. 59.20-1 Section 59... BOILERS, PRESSURE VESSELS AND APPURTENANCES Welding Repairs to Castings § 59.20-1 Carbon-steel or alloy-steel castings. Defects in carbon-steel or alloy-steel castings may be repaired by welding. The...

  13. Stress corrosion cracking in low carbon stainless steel components in BWRs

    International Nuclear Information System (INIS)

    In recent years, numbers of SCC have occurred in core shrouds and primary loop recirculation piping made of low carbon stainless steels that had been recognized to be an SCC-resistant material. These incidents resulted in long-term shutdown of Japanese boiling water reactors and have drawn social as well as technical interests. This paper will provide an introductory review on (1) background of SCC observed in low carbon stainless steel components in BWRs, (2) characteristics of SCC in core shrouds and PLR piping, (3) structural integrity evaluation, (4) SCC mitigation techniques, (5) SCC mechanism and (6) research topics that should be covered regarding these issues. (author)

  14. The precision cutting control research of automotive stainless steel thin wall pipe

    Directory of Open Access Journals (Sweden)

    Jin Lihong

    2015-01-01

    Full Text Available Stainless steel thin-walled tube are widely used in automobile industry at present, but as a result of thin wall pipe is poor strength and poor rigidity,which lead to deformation, shaped differencer and other problems in the process, it is hard to ensure the processing quality of parts. This paper proposes a method of thin stainless steel thin wall pipe cutting process in vehicle, greatly improved the problems and technical difficulties in the traditional process, the main research is about the cutting system and the hydraulic fixture design, obtained under low cost circumstances, it can realize high precision stainless steel pipes, high degree of automation to automatic cutting,simplified operation steps at the same time, increased the applicability of the system, provided a kind of advanced stainless steel thin wall pipe cutting device for the small and medium-sized enterprises.

  15. 77 FR 14002 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines: Final Results...

    Science.gov (United States)

    2012-03-08

    ... International Trade Administration Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the... duty orders on stainless steel butt-weld pipe fittings (butt-weld pipe fittings) from Italy, Malaysia...'' section of this notice. \\1\\ See Initiation of Five-Year (``Sunset'') Review, 76 FR 67412 (November 1,...

  16. Stress corrosion cracking susceptibility of various austenitic stainless steel pipe welds in high temperature oxygenated water

    International Nuclear Information System (INIS)

    Stress corrosion cracking (SCC) susceptibility of various austenitic stainless steel pipe welds has been studied by means of constant load tensile tests and pipe tests in 2880C water containing 26 ppm dissolved oxygen. The results obtained are summarized as follows: (1) SCC susceptibility of SUS 304 pipe welds is comparatively low under the condition of as-welded. It becomes, however, high remarkably by grinder operation and/or low temperature sensitization heat treatment. The distribution of time of failure on SUS 304 pipe welds can be expressed as a log-normal or Weibull distribution. (2) SUS 304L, 304NG, 316NG, and 347 stainless steel pipe welds have a good SCC resistance and sensitization resistance. Furthermore, the life estimation on alternate pipe welds was conducted statistically. (author)

  17. Plain carbon steel bipolar plates for PEMFC

    Institute of Scientific and Technical Information of China (English)

    WANG Jianli; SUN Juncai; TIAN Rujin; XU Jing

    2006-01-01

    Bipolar plates are a multifunctional component of PEMFC. Comparing with the machined graphite and stainless steels, the plain carbon steel is a very cheap commercial metal material. In this paper, the possibility of applying the plain carbon steels in the bipolar plate for PEMFC was exploited. In order to improve the corrosion resistance of the low carbon steel in the PEMFCs' environments,two surface modification processes was developed and then the electrochemical performances and interfacial contact resistance (ICR) of the surface modified plate of plain carbon steel were investigated. The results show that the surface modified steel plates have good corrosion resistance and relatively low contact resistance, and it may be a candidate material as bipolar plate of PEMFC.

  18. Recorded seismic response of a base-isolated steel bridge carrying a steel water pipe

    Science.gov (United States)

    Safak, E.; Brady, A.G.

    1989-01-01

    A set of strong motion records was obtained from the base-isolated Santa Ana River Pipeline Bridge during the magnitude 5.9 Whittier Narrows, California, earthquake of October 1, 1987. The analysis of the records show that the level of excitation was not strong enough to fully activate the base isolators. The dominant modes of the response are the translations of the abutment-bridge-pipe system in the longitudinal and transverse directions, and the bending of the steel truss between supports in the vertical direction.

  19. 78 FR 25253 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure From the People's Republic of China...

    Science.gov (United States)

    2013-04-30

    ...The Department of Commerce (``the Department'') is rescinding the administrative review of the countervailing duty order on certain seamless carbon and alloy steel standard, line, and pressure pipe (``seamless pipe'') from the People's Republic of China (``PRC'') for the period January 1, 2011, through December 31,...

  20. 77 FR 5240 - Light-Walled Welded Rectangular Carbon Steel Tubing From Taiwan: Continuation of Antidumping Duty...

    Science.gov (United States)

    2012-02-02

    ... of Five-Year (``Sunset'') Review, 76 FR 38613 (July 1, 2011) and Certain Pipe and Tube From Brazil... Order; Light-Walled Welded Rectangular Carbon Steel Tubing From Taiwan, 54 FR 12467 (March 27, 1989). As... within a reasonably foreseeable time. See Light-Walled Rectangular Pipe and Tube From Taiwan, 77 FR...

  1. Extreme value statistical analysis for wall thickness of elbow part of carbon steel tube

    International Nuclear Information System (INIS)

    Relating to the resent accident occurred in Mihama Nuclear Power Plant, the estimation method of the minimum value of the wall thickness of carbon steel pipes is concerned, because the minimum wall thickness value is required to decide the exact replacement time of the pipe. Currently in the nuclear power plants, the wall thickness is measured by the ultra-sonic method and the minimum value of the wall thickness decided from the smallest value among 8 values which are obtained at 8 points set around the circumference of the pipes. The minimum value thus determined, however, is not true minimum value and the exact minimum value could be determined by the Extreme Value Statistical Analysis applying for 8 measurement values. This study aims to analyze the field data on the elbow part of carbon steel pipes in order to demonstrate the usefulness of the Extreme Value Statistical Analysis. (author)

  2. 76 FR 76369 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results of the...

    Science.gov (United States)

    2011-12-07

    ... Less Than Fair Value: Certain Circular Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2...: Light- Walled Rectangular Pipe and Tube From Mexico, 73 FR 5515, 5522 (January 30, 2008) (``LWR Pipe... Rectangular Pipe and Tube from Mexico, 73 FR 35649 (June 24, 2008). In particular, we analyze...

  3. Draft guideline of NDI for low carbon stainless steel

    International Nuclear Information System (INIS)

    The in-service inspection for the equipment at the nuclear power plants is obligated for to the electric power utilities and is implemented as the periodical utility inspection. On the other hand, the stress corrosion cracks emerge in low carbon stainless steel and the verification of the non-destructive inspection technologies becomes urgent business. JNES implemented a verification test about flaw detectability and sizing accuracy of the non-destructive inspection technologies to the reactor core shroud and the nuclear reactor recirculation pipe made of the low carbon stainless steel, and worked out the draft guideline of the non-destructive inspection. In this paper, we reports on the part of the result of the verification test which JNES implemented. (author)

  4. 78 FR 45271 - Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam

    Science.gov (United States)

    2013-07-26

    ... Commission, Washington, DC, and by publishing the notice in the Federal Register of May 24, 2013 (78 FR 31574... COMMISSION Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam Determination On the... injured by reason of imports from Malaysia, Thailand, and Vietnam of welded stainless steel pressure...

  5. 78 FR 31574 - Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam; Institution of...

    Science.gov (United States)

    2013-05-24

    ... COMMISSION Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam; Institution of... materially retarded, by reason of imports from Malaysia, Thailand, and Vietnam of welded stainless steel... the Commission's Handbook on Filing Procedures, 76 FR 62092 (Oct. 6, 2011), available on...

  6. The influence of gouge defects on failure pressure of steel pipes

    International Nuclear Information System (INIS)

    Failure pressure of API X42 steel pipes with gouge defects was estimated through a nonlinear finite element (FE) analysis. The effect of gouge length on failure pressure of different pipe diameters was investigated. Stress modified critical strain (SMCS) model was applied as in predicting the failure of the pipe. The model uses strain based criteria to predict the failure. For validation of the model, the FE results were compared to experimental data in literature showing overall good agreement. The results show that the gouge length has significant influence on failure pressure. A smaller pipe diameter gives highest value of failure pressure

  7. Arrangement for connecting a fiber-reinforced plastic pipe to a stainless steel flange

    Science.gov (United States)

    Allais, Arnaud; Hoffmann, Ernst

    2008-02-05

    Arrangement for connecting a fiber-reinforced plastic pipe (18) to a stainless steel flange (12, 16), in which the end of the fiber-reinforced plastic pipe (18) is accommodated in a ring-shaped groove (12a, 16a) in the flange (12, 16), the groove conforming to the dimensions of the fiber-reinforced plastic pipe (18), where the gap remaining between the end of the fiber-reinforced plastic pipe (18) and the ring-shaped groove (12a, 16a) is filled with a sealant (19).

  8. Investigations on strength of piping for non-condensable gas combustion. Part 2. FEM analysis of steel pipes with a valve or an elbow subjected to hydrogen-oxygen detonation

    International Nuclear Information System (INIS)

    Carbon steel pipe specimens, which had been experimentally ruptured or deformed by hydrogen-oxygen detonation, were analysed by dynamic analysis using a finite element method (FEM). Pressure load histories induced by detonation were estimated by computational fluid dynamics (CFD). These pressures were applied to the inner surface of finite element models of pipe specimens. The relationship between stress and strain for piping material was obtained by performing a tensile test at a high strain rate of up to 5000 s-1. The thickness of the pipe specimens measured by an ultra sonic thickness meter was used for the FEM model geometry. In the case of the straight pipe specimens with a closed valve, FEM analyses estimated larger deformation caused by a detonation pressure than that of the test specimens. For the ruptured elbow specimen, the rate of increase in circumferential strain calculated by FEM was as high as or higher than that of the experiment. In the case of an elbow specimen deformed by detonation pressure, CFD predicted that the peak pressure at the extrados of the elbow was increased by reflection off the pipe wall. However, it did not deform the extrados of the elbow by a large amount in both the experiment and FEM analysis. In all cases, analyses of the strains caused by detonation pressure showed that they were as high as or higher than those of the measured results in the pipe specimens. Therefore, piping design using the proposed analysis method conservatively estimates the strength of piping against detonation pressure. (author)

  9. 49 CFR 195.112 - New pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false New pipe. 195.112 Section 195.112 Transportation... PIPELINE Design Requirements § 195.112 New pipe. Any new pipe installed in a pipeline system must comply with the following: (a) The pipe must be made of steel of the carbon, low alloy-high strength, or...

  10. Development of Evaluation Technology for Prevention of Two-Phase FAC on Carbon Steel

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Kyung Mo; Shim, Heesang; Lee, Eun Hee; Hur, Do Haeng [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2014-05-15

    There are many pipelines to be managed from wall thinning by flow accelerated corrosion (FAC) in the secondary system of a nuclear power. FAC is a process in which a normally protective oxide layer on the internal carbon or low-alloy steel piping surface dissolves into a stream of flowing water or a wet steam mixture. In this process, the oxide layer becomes thinner and the corrosion rate increases until the corrosion rate and dissolution rates are equal. Recent researches and reports indicate that the FAC problem is prevalent in spite of the development of an inspection method and management skills applying computer programs. Therefore, it is important to mitigate or prevent FAC on the carbon steel, and surface coating technology has been investigated for pipeline systems in a steam flow. Since the occurrence of a Surry-2 pipe rupture accident, a lot of effort has been made to manage the FAC of carbon steel piping. Some of the chemicals were known as a corrosion inhibitor. Bateman et al. reported that the addition of Ti may decrease the FAC rate of carbon steel by ∼ 65 %, TiO{sub 2} was also effective in mitigating the stress corrosion cracking of steam generator tubes under concentrated crevice conditions. A platinum doping method was applied as another mitigation strategy of carbon steel wall thinning. Noble metal, including Pt, had produced the layers of a very high catalyst concentration and this catalytic effect induced a lower corrosion potential for nickel alloys.

  11. Development of Evaluation Technology for Prevention of Two-Phase FAC on Carbon Steel

    International Nuclear Information System (INIS)

    There are many pipelines to be managed from wall thinning by flow accelerated corrosion (FAC) in the secondary system of a nuclear power. FAC is a process in which a normally protective oxide layer on the internal carbon or low-alloy steel piping surface dissolves into a stream of flowing water or a wet steam mixture. In this process, the oxide layer becomes thinner and the corrosion rate increases until the corrosion rate and dissolution rates are equal. Recent researches and reports indicate that the FAC problem is prevalent in spite of the development of an inspection method and management skills applying computer programs. Therefore, it is important to mitigate or prevent FAC on the carbon steel, and surface coating technology has been investigated for pipeline systems in a steam flow. Since the occurrence of a Surry-2 pipe rupture accident, a lot of effort has been made to manage the FAC of carbon steel piping. Some of the chemicals were known as a corrosion inhibitor. Bateman et al. reported that the addition of Ti may decrease the FAC rate of carbon steel by ∼ 65 %, TiO2 was also effective in mitigating the stress corrosion cracking of steam generator tubes under concentrated crevice conditions. A platinum doping method was applied as another mitigation strategy of carbon steel wall thinning. Noble metal, including Pt, had produced the layers of a very high catalyst concentration and this catalytic effect induced a lower corrosion potential for nickel alloys

  12. Effects of the inner mould material on the aluminium–316L stainless steel explosive clad pipe

    International Nuclear Information System (INIS)

    Highlights: ► Different mould materials were adopted to evaluate the effect of the constraint on the clad quality. ► The interface characteristics of clad pipe were analyzed for the different clad pipe. ► The clad pipes possess excellent bonding quality. - Abstract: The clad pipe played an important part in the pipeline system of the nuclear power industry. To prepare the clad pipe with even macrosize and excellent bonding quality, in this work, different mould materials were adopted to evaluate the effect of the constraint on the clad quality of the bimetal pipe prepared by explosive cladding. The experiment results indicated that, the dimension uniformity and bonding interface of clad pipe were poor by using low melting point alloy as mould material; the local bulge or the cracking of the clad pipe existed when the SiC powder was utilized. When the steel mould was adopted, the outer diameter of the clad pipe was uniform from head to tail. In addition, the metallurgical bonding was formed. Furthermore, the results of shear test, bending test and flattening test showed that the bonding quality was excellent. Therefore, the Al–316L SS clad pipe could endure the second plastic forming

  13. Test and Research of Effects of Flame Cutting and Normal Heat Treatment to Properties of 20+Cr Carbon Steel Pipe%火焰切割及正火热处理对20控Cr碳钢管性能影响试验研究

    Institute of Scientific and Technical Information of China (English)

    燕智敏; 邹平国; 那永新

    2015-01-01

    20+Cr carbon steel pipes are widely used in the pipeline of the nuclear power plant and the pipeline, which is eroded by steam, of chemical industrial furnace. The highly efficient and convenient flame cutting technology is often used in pipe matching and machining. By comparing the chemical compositions, mechanical properties and metallurgical constitution for both flame cutting and sawing on 20+Cr carbon steel pipes, it had been revealed that flame cutting will bring in several problems, such as unqualified-20 ℃impact energy, coarse grains and the segregation of ferrite and pearlite. The heat-affected zone by flame cutting will be as large as 30mm. The heat treatment experiment of normalization under temperature of 890~930℃indicated that after normalizing heat treatment,-20℃impact energy of the steel had been recovered to the normal level. In addition, the coarse grains would be refined to grain size of grade 8-9 and carbides homogeneously distributed.%20控Cr优质碳钢管广泛应用于核电站管路系统和化学工业炉上有蒸汽冲刷的管道系统,在管件加工、配管过程中不可避免地采用了高效、便捷的火焰切割方法。通过对20控Cr碳钢管在火焰切割与锯切后的化学成分、力学性能、金相试样对比发现,火焰切割将带来-20℃冲击功不满足技术要求、晶粒长大、铁素体与珠光体偏析等系列问题,火焰切割影响范围超过30 mm。正火(890~930℃)热处理校正工艺工程应用试验表明,经过正火热处理校正后,可将受到火焰切割影响的-20℃冲击功数值恢复到正常水平;同时,粗大的晶粒得以细化,晶粒度在8~9之间,碳化物分布均匀化。

  14. Finite element thermal analysis of the fusion welding of a P92 steel pipe

    Directory of Open Access Journals (Sweden)

    A. H. Yaghi

    2012-05-01

    Full Text Available Fusion welding is common in steel pipeline construction in fossil-fuel power generation plants. Steel pipes in service carry steam at high temperature and pressure, undergoing creep during years of service; their integrity is critical for the safe operation of a plant. The high-grade martensitic P92 steel is suitable for plant pipes for its enhanced creep strength. P92 steel pipes are usually joined together with a similar weld metal. Martensitic pipes are sometimes joined to austenitic steel pipes using nickel based weld consumables. Welding involves severe thermal cycles, inducing residual stresses in the welded structure, which, without post weld heat treatment (PWHT, can be detrimental to the integrity of the pipes. Welding residual stresses can be numerically simulated by applying the finite element (FE method in Abaqus. The simulation consists of a thermal analysis, determining the temperature history of the FE model, followed by a sequentially-coupled structural analysis, predicting residual stresses from the temperature history.

    In this paper, the FE thermal analysis of the arc welding of a typical P92 pipe is presented. The two parts of the P92 steel pipe are joined together using a dissimilar material, made of Inconel weld consumables, producing a multi-pass butt weld from 36 circumferential weld beads. Following the generation of the FE model, the FE mesh is controlled using Model Change in Abaqus to activate the weld elements for each bead at a time corresponding to weld deposition. The thermal analysis is simulated by applying a distributed heat flux to the model, the accuracy of which is judged by considering the fusion zones in both the parent pipe as well as the deposited weld metal. For realistic fusion zones, the heat flux must be prescribed in the deposited weld pass and also the adjacent pipe elements. The FE thermal results are validated by comparing experimental temperatures measured by five thermocouples on the

  15. Surface coatings on carbon steel for prevention of flow accelerated corrosion under two phase flow conditions

    Energy Technology Data Exchange (ETDEWEB)

    Shim, Hee-Sang; Kim, Kyung Mo; Hur, Do Haeng [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Kim, Seung Hyun; Kim, Ji Hyun [Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)

    2015-05-15

    Since the occurrence of a Surry-2 pipe rupture accident, a lot of effort has been made to prevent FAC of carbon steel piping. Some of the chemicals were suggested as a corrosion inhibitor. A platinum decoration was applied as another prevention strategy of carbon steel thinning. The severe FAC-damaged carbon steel pipings were replaced by tolerant materials such as SA335 Gr.P22. However, some components such as the piping materials between moisture separator and turbine have still suffered from the FAC degradation. This work provides a coating method to prevent the FAC degradation of the SA106 Gr.B, which is a piping material between moisture separator and high-pressure turbine, under two-phase flow. We suggested the coating materials to prevent FAC of SA106Gr.B under two-phase water-vapor flow. The FAC resistance of SA106Gr.B was improved with 5 times by electroless-deposited Ni-P protective layer. Other coating materials also enhanced the tolerance up to 5 times for the FAC in a condition of 150 .deg. C and 3.8 bar at 9.5 compared to non-coated SA106Gr.B.

  16. A study of ceramic-lined composite steel pipes prepared by SHS centrifugal-thermite process

    OpenAIRE

    Li Yuxin; Jiang Letao; Lu Qing; Bai Peikang; Liu Bin; Wang Jianhong

    2016-01-01

    Al2O3 ceramic-lined steel pipe was produced by self-propagating high-temperature synthesis centrifugal thermite process (SHS C-T process) from Fe2O3 and Al as the raw materials. The composition, phase separation and microstructures were investigated. The result showed the ceramic lined pipe is composed of the three main layers of various compositions, which were subsequently determined to be Fe layer, the transition layer and the ceramic layer. Fe layer is ...

  17. 78 FR 34342 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results and Partial Rescission of...

    Science.gov (United States)

    2013-06-07

    ... Fair Value: Certain Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992) (Antidumping... Circular Welded Non-Alloy Steel Pipe from Mexico, 75 FR 82374 (December 30, 2010). Mueller submitted a ``no... Rescission of Antidumping Duty Administrative Review; 2010-11, 77 FR 73617 (December 11, 2012)...

  18. 77 FR 10773 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Scheduling of...

    Science.gov (United States)

    2012-02-23

    ... COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Scheduling of... antidumping duty orders on stainless steel butt-weld pipe fittings from Italy, Malaysia, and the Philippines... to its notice of institution (76 FR 67473, November 1, 2011) of the subject five-year reviews...

  19. 75 FR 34980 - Circular Welded Non-Alloy Steel Pipe from the Republic of Korea: Final Results of the Antidumping...

    Science.gov (United States)

    2010-06-21

    ... Welded Non-Alloy Steel Pipe and Tube From Brazil, the Republic of Korea, Mexico, and Venezuela, 61 FR... Sales at Less Than Fair Value: Certain Circular Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453... Korea: Preliminary Results and Rescission in Part of the Antidumping Duty Administrative Review, 74...

  20. 76 FR 36089 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final Results of the Antidumping...

    Science.gov (United States)

    2011-06-21

    ... Welded Non-Alloy Steel Pipe and Tube From Brazil, the Republic of Korea, Mexico, and Venezuela, 61 FR... Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992). These deposit requirements shall... Republic of Korea: Preliminary Results of the Antidumping Duty Administrative ] Review, 75 FR...

  1. 75 FR 39917 - Circular Welded Non-Alloy Steel Pipe from the Republic of Korea: Extension of Time Limit for...

    Science.gov (United States)

    2010-07-13

    ... for Revocation in Part, 74 FR 68229 (December 23, 2009). The current deadline for the preliminary... International Trade Administration (A-580-809) Circular Welded Non-Alloy Steel Pipe from the Republic of Korea... non-alloy steel pipe from the Republic of Korea, covering the period November 1, 2008 through...

  2. 77 FR 8808 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of the Final Results...

    Science.gov (United States)

    2012-02-15

    ... From the Republic of Korea: Preliminary Results of the Antidumping Duty Administrative Review, 76 FR... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of... antidumping duty administrative review of circular welded non-alloy steel pipe from the Republic of...

  3. Microbial-Influenced Corrosion of Corten Steel Compared with Carbon Steel and Stainless Steel in Oily Wastewater by Pseudomonas aeruginosa

    Science.gov (United States)

    Mansouri, Hamidreza; Alavi, Seyed Abolhasan; Fotovat, Meysam

    2015-07-01

    The microbial corrosion behavior of three important steels (carbon steel, stainless steel, and Corten steel) was investigated in semi petroleum medium. This work was done in modified nutrient broth (2 g nutrient broth in 1 L oily wastewater) in the presence of Pseudomonas aeruginosa and mixed culture (as a biotic media) and an abiotic medium for 2 weeks. The behavior of corrosion was analyzed by spectrophotometric and electrochemical methods and at the end was confirmed by scanning electron microscopy. The results show that the degree of corrosion of Corten steel in mixed culture, unlike carbon steel and stainless steel, is less than P. aeruginosa inoculated medium because some bacteria affect Corten steel less than other steels. According to the experiments, carbon steel had less resistance than Corten steel and stainless steel. Furthermore, biofilm inhibits separated particles of those steels to spread to the medium; in other words, particles get trapped between biofilm and steel.

  4. Damage mechanism of piping welded joints made from austenitic Steel for the type RBMK reactor

    International Nuclear Information System (INIS)

    In the process of operation of RBMK reactors the damages were taking place on welded piping, produced from austenitic stainless steel of the type 08X18H10T. The inspection of damaged sections in piping has shown that in most cases crack-like defects are of corrosion and mechanical character. The paper considers in details the reasons of damages appearance and their development for this type of welded joints of downcomers 325xl6 mm, which were fabricated from austenitic stainless steel using TlG and MAW welding methods. (author)

  5. Evaluation of residual stress distribution in austenitic stainless steel pipe butt-welded joint

    International Nuclear Information System (INIS)

    This paper reports measured and estimated results of residual stress distributions of butt-welded austenitic stainless steel pipe in order to improve estimation accuracy of welding residual stress. Neutron diffraction and strain gauge method were employed for the measurement of the welding residual stress and its detailed distributions on inner and outer surface of the pipe as well as the distributions within the pipe wall were obtained. Finite element method was employed for the estimation. Transient and residual stresses in 3D butt-welded joint model were computed by employing Iterative Substructure Method and also commercial FEM code ABAQUS for a reference. The measured and estimated distributions presented typical characteristic of straight butt-welded pipe which had decreasing trend along the axial direction and bending type distributions through wall of the pipe. Both results were compared and the accuracy of measurement and estimation was discussed. (author)

  6. Castings for stainless steel primary piping in PWR nuclear power plant

    International Nuclear Information System (INIS)

    Primary piping steel of Z3CN20-09M for nuclear power plant is melted by combination of electric furnace and AOD furnace, ferrite content of Z3CN20-09M are adjusted based on the compute result of Scharffler. Measures by enlarging the wall thickness of shell, decreasing inside diameter of the baffle, selecting greater g value and increasing machining allowances of internal surface, etc, in centrifugal casting process, sample of primary piping are cast. Measure results show that various performance of sample of primary piping the needs of RCC-M are without exception meet

  7. Development of a linac CT scanner for defect imaging in steel piping

    International Nuclear Information System (INIS)

    The authors report on the development of a linac CT scanner for pipe inspection. The scanner is equipped with a small sized 0.95 MeV linac as a highly penetrable x-ray source, and 30 channel compact solid-state detector units (CdWO4 scintillator + photodiode). A precise scanning system is realized on the basis of a new scanning method, scanner rotating sector scan. This system can be easily disassembled for setting the scanner itself onto fixed piping. A tomogram of steel piping up to 300A Sch40 can be reconstructed within an hour. A 0.1 mm wide slit was clearly visualized

  8. Determination of vibration strain limits of A106B piping steel

    International Nuclear Information System (INIS)

    Steam pipes and other piping components in generating stations may be subjected to low amplitude high cycle fatigue due to flow induced vibration and high frequency thermal fatigue. Fatigue design curves extending to 108 cycles do not exist for A106B piping steel. Therefore, a fracture mechanics approach which uses the concept of threshold stress intensity factor was utilized to determine a limit of fatigue strain amplitude for a fatigue life exceeding 108 cycles. Threshold stress intensity factors were determined for parent material and weld material in room temperature air and 1000C wet steam environment. (orig.)

  9. Shock Wave Speed and Transient Response of PE Pipe with Steel-Mesh Reinforcement

    Directory of Open Access Journals (Sweden)

    Wuyi Wan

    2016-01-01

    Full Text Available A steel mesh can improve the tensile strength and stability of a polyethylene (PE pipe in a water supply pipeline system. However, it can also cause more severe water hammer hazard due to increasing wave speed. In order to analyze the influence of the steel mesh on the shock wave speed and transient response processes, an improved wave speed formula is proposed by incorporating the equivalent elastic modulus. A field measurement validates the wave speed formula. Moreover, the transient wave propagation and extreme pressures are simulated and compared by the method of characteristics (MOC for reinforced PE pipes with various steel-mesh densities. Results show that a steel mesh can significantly increase the shock wave speed in a PE pipe and thus can cause severe peak pressure and hydraulic surges in a water supply pipeline system. The proposed wave speed formula can more reasonably evaluate the wave speed and improve the transient simulation of steel-mesh-reinforced PE pipes.

  10. Estimates of margins in ASME Code strength values for stainless steel nuclear piping

    International Nuclear Information System (INIS)

    The margins in the ASME Code stainless steel allowable stress values that can be attributed to the variations in material strength are evaluated for nuclear piping steels. Best-fit curves were calculated for the material test data that were used to determine allowable stress values for stainless steels in the ASME Code, supplemented by more recent data, to estimate the mean stresses. The mean yield stresses from the test data are about 15 to 20% greater than the ASME Code yield stress values (the stainless steel Sm values are based on the yield stress). The ASME Code yield stress values are estimated to approximately coincide with the 97% confidence limit from the test data. The mean and 97% confidence limit values can be used in probabilistic risk assessments of nuclear piping

  11. Z factors for aged cast duplex stainless steel pipes and welds

    International Nuclear Information System (INIS)

    This paper provides the Z factors of aged cast duplex stainless steel pipes and their welds with circumferential through-wall crack obtained form the Japanese material data. Z factors are used for elastic-plastic evaluation in ASME Code Section XI. Stress-strain curve and J-resistance curve taken from the base metal of cast duplex stainless steel with ferrite contents of about 23.5% and its adjoining welds of TIG (Tungsten Inert Gas), SMAW (Shielded Metal Arc Welding), and SAW (Submerged Arc Welding) were used. These material were aged for 20000 to 40000 hours at 400 degrees C. The calculated Z factors were formulated in using the approximation with a linear equation of logarithm to the base ten. The proposed Z factors were compared with the Z factors in ASME Code Section XI. In the case of TIG and SMAW, the proposed Z factors give almost the same as the Z factors in ASME Code Section XI. In the case of SAW and cast stainless steel, the proposed Z factors were higher than the Z factors in ASME Code Section XI. Besides, In order to verify the availability of proposed Z factors, the critical bending moments by Z factors were compared with experimental data of aged cast duplex stainless steel pipes. The proposed Z factor for SAW and aged cast duplex stainless steel would be applied to estimate the failure moment of aged cast duplex stainless steel pipes. (author)

  12. Welding of high manganese- and carbon steels

    International Nuclear Information System (INIS)

    Technology and conditions of welding of high manganese and carbon steel by a resistance welding technique using an intermediate part are developed. Austenitic chromium-nickel 12Kh18N10T steel is chosen as a material of the intermediate part. The recommended welding conditions insure a high quality of the weld joint in terms of metal structure and its mechanical properties. It is the basic metal of the joint that fractures under mechanical testing

  13. Marine atmospheric corrosion of carbon steels

    OpenAIRE

    Morcillo, Manuel; Alcántara, Jenifer; Díaz, Iván; Chico, Belén; Simancas, Joaquín; de la Fuente, Daniel

    2015-01-01

    Basic research on marine atmospheric corrosion of carbon steels is a relatively young scientific field and there continue to be great gaps in this area of knowledge. The presence of akaganeite in the corrosion products that form on steel when it is exposed to marine atmospheres leads to a notable increase in the corrosion rate. This work addresses the following issues: (a) environmental conditions necessary for akaganeite formation; (b) characterisation of akaganeite in the corrosion products...

  14. Deformation and Recrystallisation in Low Carbon Steels

    OpenAIRE

    Almojil, Marwan

    2010-01-01

    The annealing behaviour, including studies of recrystallisation kinetics anddevelopment of crystallographic texture, of two low carbon steels after different coldrolling reductions have been investigated using Optical Microscopy (OM), ElectronBack-Scatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM).The primary recrystallisation behaviour of 20, 50, 70 and 90% cold rolled InterstitialFree (IF) and High Strength Low Alloy (HSLA) steels was studied. The HSLA wasinitially proces...

  15. Influence of hot bending on microstructure changes of thick-walled P92 steel pipe

    Czech Academy of Sciences Publication Activity Database

    Král, Petr; Sklenička, Václav; Kuchařová, Květa; Kvapilová, Marie; Svobodová, M.

    Toulouse : Institut Carnot CIRIMAT, 2015. s. 182-183. [CREEP 2015 - International Conference on Creep and Fracture of Engineering Materials and Structures /13./. 31.05.2015-04.06.2015, Toulouse] R&D Projects: GA TA ČR TA02010260 Institutional support: RVO:68081723 Keywords : hot bending * P92 steel pipe * creep behaviour * microstructure * EBSD Subject RIV: JG - Metallurgy

  16. STUDY OF ELECTROMAGNETIC STIRRING REFINING MICRO- STRUCTURES OF PIPE-LINE STEEL SAW DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    Y. Zhang; B.N. Qian; X.M. Guo

    2002-01-01

    The effects of electromagnetic stirring on the microstructures of pipe-line steel SAWdeposited metal were investigated. The results showed that electromagnetic stirringincreased the number density of inclusions with 0.2-0.6μm in diameter and promotedthe formation and refining of acicular ferrite within austenite grains. The low tem-perature toughness of deposited metal was improved.

  17. Recommended practices for welding of chromium-molybdenum steel piping and tubing

    International Nuclear Information System (INIS)

    This book contains recommendations for welding chromium-molybdenum steel pipe and tubing to itself and to various other materials. Subjects covered in detail are filler metal selection, joint design, preheating, and postheating. Particular emphasis is placed on the importance of maintaining interpass temperature and dangers inherent in interrupted heating cycles

  18. 77 FR 39735 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines

    Science.gov (United States)

    2012-07-05

    ... COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines Determination On... fittings From Italy, Malaysia, and the Philippines would be likely to lead to continuation or recurrence of... The Commission instituted these reviews on November 1, 2011 (76 FR 67473) and determined on February...

  19. Comparison of two modeling approaches of eddy current industrial non-destructive testing of steel pipes

    Science.gov (United States)

    Trillon, Adrien; Deneuville, François; Reboud, Christophe; Foucher, Fabrice; Lesselier, Dominique; Maurice, Lea

    2014-02-01

    In the framework of the COFREND working group "Eddy current modeling", a benchmark has been proposed by the Vallourec research center. This case corresponds to the modeling of an industrial online testing of seamless steel pipes by eddy current method with encircling coils. The centering of the steel pipe in the coil is not considered as perfect and a shift is imposed to the pipe. For this benchmark, the Vallourec research center (VRA, Vallourec Research Aulnoye) has compared two solutions with different approaches: the first one is based on semi-analytical methods through the CIVA software developed by the CEA, the second one on finite element method through the software Flux. Results for these two approaches are very similar between them and coherent to experimental data. It proves that these two simulations methods are valid and could be used as a complementary approach.

  20. Superfluid helium testing of a stainless steel to titanium piping transition joint

    Energy Technology Data Exchange (ETDEWEB)

    Soyars, W.; /Fermilab; Basti, A.; Bedeschi, F.; /INFN, Pisa; Budagov, J.; /Dubna, JINR; Foley, M.; Harms, E.; Klebaner, A.; Nagaitsev, S.; /Fermilab; Sabirov, B.; Dubna, JINR

    2009-11-01

    Stainless steel-to-titanium bimetallic transitions have been fabricated with an explosively bonded joint. This novel joining technique was conducted by the Russian Federal Nuclear Center, working under contract for the Joint Institute for Nuclear Research. These bimetallic transitions are being considered for use in future superconducting radio-frequency cavity cryomodule assemblies. This application requires cryogenic testing to demonstrate that this transition joint remains leak-tight when sealing superfluid helium. To simulate a titanium cavity vessel connection to a stainless steel service pipe, bimetallic transition joints were paired together to fabricate piping assemblies. These piping assemblies were then tested in superfluid helium conditions at Fermi National Accelerator Laboratory test facilities. The transition joint test program will be described. Fabrication experience and test results will be presented.

  1. Superfluid helium testing of a stainless steel to titanium piping transition joint

    CERN Document Server

    Soyars, W; Bedeschi, F; Budagov, J; Foley, M; Harms, E; Klebaner, A; Nagaitsev, S; Sabirov, B; 10.1063/1.3422408

    2012-01-01

    Stainless steel-to-titanium bimetallic transitions have been fabricated with an explosively bonded joint. This novel joining technique was conducted by the Russian Federal Nuclear Center, working under contract for the Joint Institute for Nuclear Research. These bimetallic transitions are being considered for use in future superconducting radio-frequency cavity cryomodule assemblies. This application requires cryogenic testing to demonstrate that this transition joint remains leak-tight when sealing superfluid helium. To simulate a titanium cavity vessel connection to a stainless steel service pipe, bimetallic transition joints were paired together to fabricate piping assemblies. These piping assemblies were then tested in superfluid helium conditions at Fermi National Accelerator Laboratory test facilities. The transition joint test program will be described. Fabrication experience and test results will be presented.

  2. Resonant modes in centrifugally cast stainless steel (CCSS) pipes

    International Nuclear Information System (INIS)

    In general, Lamb-wave modes can be grouped into two fundamental types: symmetric modes or antisymmetric modes, depending on whether their displacement vector is symmetric or antisymmetric with respect to the median plane of the solid plate. The resonant modes of a CCSS pipe are more general because a pipe is a cylindrical shell and, in the case of columnar-grain CCSS, has to be treated as a anisotropic medium. In this paper, we evaluate how the resonant modes of a CCSS pipe deviate from those of an isotropic plate. The deviation due to either the material anisotropy or the cylindrical curvature is examined. We focus on the Lamb-type modes of a thick cylindrical shell and model the CCSS as a transversely isotropic plate. For reference, a quick review of the dispersion properties of an isotropic plate is provided

  3. Enhanced fluid flow through nanoscale carbon pipes.

    Science.gov (United States)

    Whitby, Max; Cagnon, Laurent; Thanou, Maya; Quirke, Nick

    2008-09-01

    Recent experimental and theoretical studies demonstrate that pressure driven flow of fluids through nanoscale ( d < 10 nm) carbon pores occurs 4 to 5 orders of magnitude faster than predicted by extrapolation from conventional theory. Here, we report experimental results for flow of water, ethanol, and decane through carbon nanopipes with larger inner diameters (43 +/- 3 nm) than previously investigated. We find enhanced transport up to 45 times theoretical predictions. In contrast to previous work, in our systems, decane flows faster than water. These nanopipes were composed of amorphous carbon deposited from ethylene vapor in alumina templates using a single step fabrication process. PMID:18680352

  4. Heat sink welding of austenitic stainless steel pipes to control distortion and residual stress

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, H.; Albert, S.K.; Bhaduri, A.K. [Materials Technology Div., Indira Gandhi Centre for Atomic Research, Kalpakkam (India)

    2007-07-01

    Construction of India's Prototype Fast Breeder Reactor (PFBR) involves extensive welding of austenitic stainless steels pipes of different dimensions. Due to high thermal expansion coefficient and poor thermal conductivity of this class of steels, welding can result in significant distortion of these pipes. Attempts to arrest this distortion can lead to high levels of residual stresses in the welded parts. Heat sink welding is one of the techniques often employed to minimize distortion and residual stress in austenitic stainless steel pipe welding. This technique has also been employed to repair welding of the piping of the Boiling Water Reactors (BWRs) subjected to radiation induced intergranular stress corrosion cracking (IGSCC). In the present study, a comparison of the distortion in two pipe welds, one made with heat sink welding and another a normal welds. Pipes of dimensions 350{phi} x 250(L) x 8(t) mm was fabricated from 316LN plates of dimensions 1100 x 250 x 8 mm by bending and long seam (L-seam) welding by SMAW process. Two fit ups with a root gap of 2 mm, land height of 1mm and a groove angle of 70 were prepared using these pipes for circumferential seam (C-seam) welding. Dimensions at predetermined points in the fit up were made before and after welding to check the variation in radius, circumference and and ovality of the pipes. Root pass for both the pipe fit up were carried out using conventional GTAW process with 1.6 mm AWS ER 16-8-2 as consumables. Welding of one of the pipe fit ups were completed using conventions GTAW process while the other was completed using heat sink welding. For second and subsequent layers of welding using this process, water was sprayed at the root side of the joint while welding was in progress. Flow rate of the water was {proportional_to}6 1/minute. Welding parameters employed were same as those used for the other pipe weld. Results of the dimensional measurements showed that there is no circumferential shrinkage in

  5. Evaluation of weld defects in stainless steel 316L pipe using guided wave

    International Nuclear Information System (INIS)

    Stainless steel is a popular structural materials for liquid-hydrogen storage containers and piping components for transporting high-temperature fluids because of its superior material properties such as high strength and high corrosion resistance at elevated temperatures. In general, tungsten inert gas (TIG) arc welding is used for bonding stainless steel. However, it is often reported that the thermal fatigue cracks or initial defects in stainless steel after welding decreases the reliability of the material. The objective of this paper is to clarify the characteristics of ultrasonic guided wave propagation in relation to a change in the initial crack length in the welding zone of stainless steel. For this purpose, three specimens with different artificial defects of 5 mm, 10 mm, and 20 mm in stainless steel welds were prepared. By considering the thickness of s stainless steel pipe, special attention was given to both the L(0,1) mode and L(0,2) mode in this study. It was clearly found that the L(0,2) mode was more sensitive to defects than the L(0,1) mode. Based on the results of the L(0,1) and L(0,2) mode analyses, the magnitude ratio of the two modes was more effective than studying each mode when evaluating defects near the welded zone of stainless steel because of its linear relationship with the length of the artificial defect.

  6. Evaluation of weld defects in stainless steel 316L pipe using guided wave

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joon Hyun [School of Mechanical Engineering, Pusan National University, Busan (Korea, Republic of); Lee, Jin Kyung [Dept. of Mechanical Engineering, Dongeui University, Busan (Korea, Republic of)

    2015-02-15

    Stainless steel is a popular structural materials for liquid-hydrogen storage containers and piping components for transporting high-temperature fluids because of its superior material properties such as high strength and high corrosion resistance at elevated temperatures. In general, tungsten inert gas (TIG) arc welding is used for bonding stainless steel. However, it is often reported that the thermal fatigue cracks or initial defects in stainless steel after welding decreases the reliability of the material. The objective of this paper is to clarify the characteristics of ultrasonic guided wave propagation in relation to a change in the initial crack length in the welding zone of stainless steel. For this purpose, three specimens with different artificial defects of 5 mm, 10 mm, and 20 mm in stainless steel welds were prepared. By considering the thickness of s stainless steel pipe, special attention was given to both the L(0,1) mode and L(0,2) mode in this study. It was clearly found that the L(0,2) mode was more sensitive to defects than the L(0,1) mode. Based on the results of the L(0,1) and L(0,2) mode analyses, the magnitude ratio of the two modes was more effective than studying each mode when evaluating defects near the welded zone of stainless steel because of its linear relationship with the length of the artificial defect.

  7. 76 FR 18251 - Carbon and Alloy Seamless Standard, Line, and Pressure Pipe From Japan Andromania

    Science.gov (United States)

    2011-04-01

    ... of large diameter carbon and alloy seamless standard, line, and pressure pipe from Romania (65 FR... standard, line, and pressure pipe from Japan and Romania (71 FR 26746). The Commission is now conducting... COMMISSION Carbon and Alloy Seamless Standard, Line, and Pressure Pipe From Japan Andromania AGENCY:...

  8. Tests Of Protective Coats For Carbon Steel

    Science.gov (United States)

    Macdowell, Louis G., III

    1995-01-01

    Report describes laboratory and field tests of candidate paints (primers, tie coats, and topcoats) for use in protecting carbon-steel structures against corrosion in seaside environment at Kennedy Space Center. Coating materials selected because of utility in preventing corrosion, also on basis of legal requirements, imposed in several urban areas, for reduction of volatile organic contents.

  9. Effects of dynamic coupling between freestanding steel containment and attached piping

    International Nuclear Information System (INIS)

    This paper presents an accurate, practical method of converting uncoupled response time history results obtained from an uncoupled structure model into coupled response time histories using a post-processor routine. The method is rigorous and only requires the modal properties of the uncoupled structure model, the modal properties of the uncoupled attached equipment model, and the uncoupled time histories of the attachment points on the structure. Coupled response spectra or time histories for use as input to an uncoupled equipment model are obtained. Comparisons of coupled versus uncoupled analysis results are presented for representative piping systems attached to a typical BWR Mark III steel containment subjected to vibration from safety relief valve discharge with a fundamental frequency of 12 Hz. It is shown that the coupled response spectra at piping attachment points are reduced by a factor between 2 and 5 from the amplified uncoupled spectra at each significant piping modal frequency above 20 Hz for representative major piping systems attached to the unstiffened portion of the steel shell. Responses at lower frequencies are not generally reduced and may increase by coupling effects for the input loading and shell model studied. Peak accerations are generally significantly reduced while peak displacements may be decreased or increased. Rules are presented for estimating the coupling effects between freestanding steel shells and attached equipment. (orig./HP)

  10. Experimentation and numerical simulation of steel fibre reinforced concrete pipes

    International Nuclear Information System (INIS)

    The results concerning on an experimental and a numerical study related to SFRCP are presented. Eighteen pipes with an internal diameter of 600 mm and fibre dosages of 10, 20 and 40 kg/m3 were manufactured and tested. Some technological aspects were concluded. Likewise, a numerical parameterized model was implemented. With this model, the simulation of the resistant behaviour of SFRCP can be performed. In this sense, the results experimentally obtained were contrasted with those suggested by means MAP reaching very satisfactory correlations. Taking it into account, it could be said that the numerical model is a useful tool for the optimal design of the SFRCP fibre dosages, avoiding the need of the systematic employment of the test as an indirect design method. Consequently, the use of this model would reduce the overall cost of the pipes and would give fibres a boost as a solution for this structural typology. (Author) 27 refs.

  11. Research of Mold Powder for Ultra-Low Carbon Steel

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    This paper explained the mechanism of carbon pickup byultra-low-carbon steels during continuous casting and indicated that the major cause of carbon pickup is the contact of the molten steel with the enriched-carbon layer of the powder. Forming of the enriched-carbon layer is due to the existing of “carbon core”. Accordingly, the measures to reduce the carbon content and amount of the enriched-carbon layer were investigated. A kind of new powder has been developed and successfully used to minimize the carbon pickup by ultra-low carbon steels during continuous casting.

  12. Reaction propagation between fireworks shells and compositions confined in steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Contestabile, E.; Von Rosen, B.

    2006-03-15

    Experimental results of ignition tests of linear arrays of fireworks articles and bulk stars were presented. Their propensity to mass-explode was explored. Reaction rates within a pile of fireworks were determined. Tests were performed with pyrotechnic composition and fireworks shells confined in steel pipes. Roman candles and similar star shells were loaded in 1 m long steel pipes capped at one or both ends. The configuration was designed to restrain shells and prevent them from moving during their initiation and communication process. Four series of tests were performed. In the first and second series, 76 mm shells were rolled in a single layer of single-sided corrugated cardboard. A continuous velocity of detonation probe (VoD) was placed in a corrugation. In the third series of tests, roman candles were inserted in pipes, and stars were housed in plastic shells. In the fourth series of tests, red stars were removed from the fireworks and placed inside a cylindrical tube. A VoD probe was inserted between layers of kraft paper and the assembly was placed into a steel pipe. Initiation stimulus was either from an explosive booster or a quantity of black powder. Effects observed in the tests involved a combination of different mechanisms. With the use of a booster, the first few shells were overdriven and responded when shock-initiated. A comparison of the number of fragments and fragment shapes demonstrated 3 different modes of response. Star shells and roman candles produced a few, large fragments. Larger roman candles and report shells produced significantly more longitudinal fragments. Results suggested that the mechanism of propagation of a reaction inside the pipe was dependent on the packing configuration within the pipe. Further work is need to determine the effects of confinement and packing density. 11 refs., 2 tabs., 15 figs.

  13. Applications of niobium microalloyed ferrite pearlite steels to line pipe and plate

    International Nuclear Information System (INIS)

    A variety of advanced controlled rolling techniques have been developed to improve toughness, strength and weldability of niobium-steels. To achieve optimum properties, control of prior stage rolling conditions and accelerated cooling are needed. In low carbon steel, the addition of niobium results in a greater increase in tensile strength than that of vanadium without a loss of toughness. At the same strength level, niobium-steel has less susceptibility to weld cracking and good toughness in the HAZ of its weldments than similar vanadium steels. Separation and formability of niobium steels are also discussed

  14. Risk management for low carbon steels in the reactor coolant loop

    International Nuclear Information System (INIS)

    The codes and regulations give engineers some flexibility in the materials to be used in nuclear power for the power train. As long as multiple levels of containment are in place, it is low carbon steels for such items as pumps, pipes, valves and other fittings. This paper proposes the use of low carbon steels in many places where stainless steels have been used traditionally. The risk of materials failure is shown to be equal, or less than, with stainless steels. This is evidenced with a discussion of the mechanisms by which failure occurs. The benefits of using low carbon steels are multiple: cost, ease of maintenance, less down time and availability of replacement parts. It is also proposed that use of low carbon steels will make the individual components more safe, because mass produced, commercially-tested products are used instead of special-order, single-source items. The authors presume that additional safety measures will be needed to compensate for the higher perceived safety offered by stainless steel materials. These are suggested to be additional controls, in the form of sensors, monitoring points and other electronic devices linked to a central computer monitor

  15. Transient Response to Rapid Cooling of a Stainless Steel Sodium Heat Pipe

    Science.gov (United States)

    Mireles, Omar R.; Houts, Michael G.

    2011-01-01

    Compact fission power systems are under consideration for use in long duration space exploration missions. Power demands on the order of 500 W, to 5 kW, will be required for up to 15 years of continuous service. One such small reactor design consists of a fast spectrum reactor cooled with an array of in-core alkali metal heat pipes coupled to thermoelectric or Stirling power conversion systems. Heat pipes advantageous attributes include a simplistic design, lack of moving parts, and well understood behavior. Concerns over reactor transients induced by heat pipe instability as a function of extreme thermal transients require experimental investigations. One particular concern is rapid cooling of the heat pipe condenser that would propagate to cool the evaporator. Rapid cooling of the reactor core beyond acceptable design limits could possibly induce unintended reactor control issues. This paper discusses a series of experimental demonstrations where a heat pipe operating at near prototypic conditions experienced rapid cooling of the condenser. The condenser section of a stainless steel sodium heat pipe was enclosed within a heat exchanger. The heat pipe - heat exchanger assembly was housed within a vacuum chamber held at a pressure of 50 Torr of helium. The heat pipe was brought to steady state operating conditions using graphite resistance heaters then cooled by a high flow of gaseous nitrogen through the heat exchanger. Subsequent thermal transient behavior was characterized by performing an energy balance using temperature, pressure and flow rate data obtained throughout the tests. Results indicate the degree of temperature change that results from a rapid cooling scenario will not significantly influence thermal stability of an operating heat pipe, even under extreme condenser cooling conditions.

  16. Ratcheting-fatigue failure of pressurized elbows made of carbon steel

    International Nuclear Information System (INIS)

    Fatigue ratcheting investigations have been carried out to understand the ratcheting-fatigue failure of low carbon manganese steel (SA 333 Gr. 6). Experiments have been conducted on pressured pipe-elbow assembly subjected to reversible cyclic bending, to assess the failure mechanics of fatigue ratcheting and to evaluate the piping seismic design rules intended for their structural integrity. These investigations have shown a significant influence of the ratchet strain and non-relaxing mean stress on the low cycle fatigue life of material

  17. The welding technique of thick-walled stainless steel pipes in Qinshan Ii expansion project

    International Nuclear Information System (INIS)

    The paper introduces the welding techniques of thick-walled stainless steel pipes in Qinshan II Expansion Project, which also analyses the main factors affected the weld quality in installation process, and introduces the control methods in preparation period before welding, welding products as well as welding distortion and welding stress. The article proposes solutions to quality problems of welding deformation, dislocating distortion, and lack of groove uniformity. By adopting rational welding sequence, witness point management technique, welding simulation technique, and stress distribution promotion by local patching, the welding quality can be warranted, so as to promote the development of thick-walled pipe welding technique. (authors)

  18. Experimental and numerical assessment of thermal fatigue in 316 austenitic steel pipes

    OpenAIRE

    PAFFUMI Elena; Nilsson, Karl-Fredrik; Szaraz, Zoltan

    2013-01-01

    This paper presents an experimental and numerical investigation of thermal fatigue of 316L steel pipe components with 14 mm wall thickness heated by induction to 300–550 °C on the outer surface and cyclically cooled internally with room temperature water. The damage is initiated as network of surface cracks where some cracks become dominant. At 550 °C the pipe fails after typically 50,000 cycles whereas at 300 °C the deepest cracks have only penetrated half the thickness after 250,000 cycles....

  19. A parametric study of residual stresses in multipass butt-welded stainless steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Brickstad, B. [SAQ Inspection Ltd., Stockholm (Sweden); Josefson, L. [Chalmers Univ. of Technology, Goeteborg (Sweden). Div. of Solid Mechanics

    1996-06-01

    Multipass circumferential butt-welding of stainless steel pipes is simulated numerically in a non-linear thermo-mechanical FE-analysis. In particular, the through-thickness variation at the weld and heat affected zone, of the axial and hoop stresses and their sensitivity to variation in weld parameters are studied. Recommendations are given for the through thickness variation of the axial and hoop stresses to be used when assessing the growth of surface flaws at circumferential butt welds in nuclear piping system. 31 refs, 12 tabs, 54 figs.

  20. A parametric study of residual stresses in multipass butt-welded stainless steel pipes

    International Nuclear Information System (INIS)

    Multipass circumferential butt-welding of stainless steel pipes is simulated numerically in a non-linear thermo-mechanical FE-analysis. In particular, the through-thickness variation at the weld and heat affected zone, of the axial and hoop stresses and their sensitivity to variation in weld parameters are studied. Recommendations are given for the through thickness variation of the axial and hoop stresses to be used when assessing the growth of surface flaws at circumferential butt welds in nuclear piping system. 31 refs, 12 tabs, 54 figs

  1. Study on Laser Visual Measurement Method for Seamless Steel PipeStraightness Error by Multiple Line-structured Laser Sensors

    Institute of Scientific and Technical Information of China (English)

    SUN Changku; LIU Yue; LU Rongsheng; YE Shenghua

    2001-01-01

    An original non-contact measurement method using multiple line-structured laser sensors is introduced for seamless steel pipe straightness error is in this paper. An arc appears on the surface of the measured seamless steel pipe against a line-structured laser source. After the image of the arc is accepted by a CCD camera, the coordinates of the center of the pipe cross-section circle containing the arc can be worked out through a certain algorithm. Similarly, multiple line-structured laser sensors are equipped parallel to the pipe. The straightness error of the seamless steel pipe, therefore, can be inferred from the coordinates of multiple cross-section centers obtained from every line-structured laser sernsor .

  2. Microbially induced corrosion of carbon steel in deep groundwater environment

    OpenAIRE

    Rajala, Pauliina; Carpén, Leena; Vepsäläinen, Mikko; Raulio, Mari; Sohlberg, Elina; Bomberg, Malin

    2015-01-01

    The metallic low and intermediate level radioactive waste generally consists of carbon steel and stainless steels. The corrosion rate of carbon steel in deep groundwater is typically low, unless the water is very acidic or microbial activity in the environment is high. Therefore, the assessment of microbially induced corrosion of carbon steel in deep bedrock environment has become important for evaluating the safety of disposal of radioactive waste. Here we studied the corrosion inducing abil...

  3. Hydrogen-related stress corrosion cracking in line pipe steel

    DEFF Research Database (Denmark)

    Nielsen, Lars Vendelbo

    1997-01-01

    A correlation between hydrogen concentration (C0) and the critical stress intensity factor for propagation of hydrogen-related cracks has been established by fracture mechanical testing of CT-specimens for the heat affected zone of an X-70 pipeline steel. This has been compared with field measure...

  4. Investigation on Preferential Corrosion of Welded Carbon Steel Under Flowing Conditions by EIS

    Science.gov (United States)

    Alawadhi, K.; Aloraier, A. S.; Joshi, S.; Alsarraf, J.; Swilem, S.

    2013-08-01

    Carbon steels are used extensively in construction of oil and gas pipes but they exhibit poor corrosion-resistance properties because of internal corrosion. In this research, a rotating cylinder electrode apparatus was designed so that electrodes machined from the weld metal, heat-affected zone, and parent material of a welded X65 pipeline steel could be tested in high shear stress conditions using electromechanical impedance spectroscopy. The aim was to investigate the cause of the severe localized corrosion that sometimes occurs at welds in carbon steel pipelines carrying hydrocarbons and inhibited brine solutions saturated with carbon dioxide. It was concluded that the surface films play an important role in effective inhibition, and this inhibition is more effective on a clean surface rather than on a precorroded one.

  5. Carbon steel protection in G.S. [Girldler sulphide] plants: Pt. 7

    International Nuclear Information System (INIS)

    In order to protect carbon steel towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturated aqueous solutions of hydrogen sulphide forms iron sulphide scales. In oxygen free solutions, evolution of corrosion follows the sequence mackinawite → cubic ferrous sulphide → troilite → pyrrotite → pyrite. Scales formed by pyrrotite and pyrite are the most protective layers (these are obtained at 130 deg C, 2 MPa for a period of 14 days). During a plant shutdown procedures, the carbon steel protected with those scales is exposed to water and highly humid air; under such conditions oxidation is unavoidable. Later, treatment in plant conditions does not regenerate scales because the composition of regenerated scales involves more soluble iron sulphides such as mackinawite and troilite. Therefore, it is not recommendable to expose the protective scales to atmospherical conditions. (Author)

  6. Boric acid corrosion of carbon and low alloy steels

    International Nuclear Information System (INIS)

    Leakage of borated water from the reactor coolant system of pressurized water reactors (PWRs) and the resulting corrosion of carbon and low alloy steel components are concerns that have been addressed by utilities for many years. Significant corrosion has been observed in instances where such leakage has gone undetected for several months. In 1990, the B and W Owners Group (B and WOG) sponsored a test program to determine the levels of wastage that are possible when primary water leakage occurs. In this test program, carbon and stainless steel specimens were exposed to borated water at temperatures from 300 F to 550 F. Initial boric acid concentration was controlled within the limits of 13,000 to 15,000 ppm (as H3BO3) with 1.0--2.0 ppm lithium (as LiOH) added to duplicate the primary water chemistry. Testing was performed to determine the degree of attack caused by a leak traveling along a pipe both with and without insulation. These tests show the importance of temperature and boric acid concentrations on the wastage that can occur from such a leak

  7. EIS Response of MIC on Carbon Steel

    DEFF Research Database (Denmark)

    Hilbert, Lisbeth Rischel; Maahn, Ernst

    1998-01-01

    Abstract Microbially influenced corrosion of carbon steel under sulphate reducing (sulphide-producing) bacterial activity (SRB) results in the formation of both ferrous sulphides as well as biofilm on the metal surface. The electrochemical characteristics of the ferrous sulphide/steel interface as...... identifying the formation of biofilm/ferrous sulphide layers but unfortunately also that corrosion rate estimation by these electrochemical techniques is unreliable when these layers form. These considerations are also relevant for other corrosion systems where film formation might mask the electrochemical...

  8. Analysis of Materials Science Aspects in Assessing Operational Reliability of Welded Stainless Steel Pipes for NPP Condensers

    International Nuclear Information System (INIS)

    The paper presents criteria to control quality of welded stainless steel pipes for nuclear power plant condensers and problems of assessing their operational reliability. Based on the integrated approach, welded long thin-walled pipes made of stainless steel TP 316L and its closest analogues were checked for compliance with regulatory requirements of ASTM A249 and EN 10217-7 standards. It was found that quality, geometric dimensions, structure, mechanical and technological properties of pipes produced by various manufacturers in modern production using TIG welding seam correspond to the requirements of stated standards. According to tests, the weld of pipes is resistant to intergranular corrosion, but also tends to pitting corrosion and knife corrosion. Pipes for NPP condensers should additionally be tested in order to optimize corrosion resistance requirements and for proper selection of pipe materials for condensers

  9. Hydrogen effect on properties of welded joints of pipes made of nickel-free corrosion resistant steels

    International Nuclear Information System (INIS)

    The dependence between hydrogen saturation of 08Kh18T1 steel welded joints and metal ductility has been found. It is shown that one of the main reasons of cracks formation in welded joints of 08Kh18T1 steel pipes is hydrogen embrittlement. Facilities for improved protection of welding pool and cooled off joint of gas saturation from atmosphere in manufacturing welded pipes of small diameter are developed

  10. Effects of materials and water chemistry factors on FAC rate of carbon steels

    International Nuclear Information System (INIS)

    Pipe wall thinning due to flow accelerated corrosion (FAC) is one of the most important degradation modes which can take place in nuclear power plants. Potential area of FAC is widespread in piping systems and probability of pipe failure due to FAC is relatively high compared to other causes. FAC is a complex phenomenon, where mass transfer under turbulent flow, chemical reactions at interfaces, and mass diffusion in oxide scales cooperatively or competitively interact. Among a number of influencing parameters for FAC rate, this paper focuses on Cr in carbon steels and pH of water. pH is the primary water chemistry parameter to manage FAC susceptibility of the whole piping systems. Small amount of Cr has a significant effect for improving resistance of the carbon steels to FAC. This fact offers an effective countermeasure for FAC mitigation by using Cr modified steels, but, at the same time, the Cr dependence could give difficult problems, when we manage pipe wall thinning with thickness inspections. In a procedure to sample piping lines and locations of thickness measurement, we may need to take into account Cr content of the pipes picked up for the inspection. We also need to pay attention on difference in Cr content between pipes and weld filler metal, even though the absolute Cr levels of the both steels are minor. In the cases that Cr content of weld metal is lower than that of pipe materials, circumferential grooving may form along the weld. Basically, effects of those material and water chemistry factors can be attributed to oxide scale properties, such as solubility to water, porosity, semiconductor property, etc. This paper briefly reviews experimental data of Cr, Ni, Cu effects and of pH effects, including both widely recognized 'historical' data and recent data on combined effects of Cr content and pH obtained by the authors. Characteristics of oxide scales formed in the FAC experiments, such as defect characteristics and Cr enrichment distribution, and

  11. 75 FR 78216 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results of Antidumping Duty...

    Science.gov (United States)

    2010-12-15

    ... questionnaire response at Exhibit S-5. While TUNA had a general knowledge that some of its pipe would be... Mexico, 75 FR 67685 (November 3, 2010). Therefore, we are continuing to refer to this entity as TUNA for... Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992) (Antidumping Duty Order)....

  12. 76 FR 67473 - Stainless Steel Butt-Weld Pipe Fittings from Italy, Malaysia, and The Philippines; Institution of...

    Science.gov (United States)

    2011-11-01

    ...-weld pipe fittings from Italy, Malaysia, and the Philippines (71 FR 71530). The Commission is now... COMMISSION Stainless Steel Butt-Weld Pipe Fittings from Italy, Malaysia, and The Philippines; Institution of... From Italy, Malaysia, and the Philippines AGENCY: United States International Trade Commission....

  13. Microbially induced corrosion of carbon steel in deep groundwater environment

    Science.gov (United States)

    Rajala, Pauliina; Carpén, Leena; Vepsäläinen, Mikko; Raulio, Mari; Sohlberg, Elina; Bomberg, Malin

    2015-01-01

    The metallic low and intermediate level radioactive waste generally consists of carbon steel and stainless steels. The corrosion rate of carbon steel in deep groundwater is typically low, unless the water is very acidic or microbial activity in the environment is high. Therefore, the assessment of microbially induced corrosion of carbon steel in deep bedrock environment has become important for evaluating the safety of disposal of radioactive waste. Here we studied the corrosion inducing ability of indigenous microbial community from a deep bedrock aquifer. Carbon steel coupons were exposed to anoxic groundwater from repository site 100 m depth (Olkiluoto, Finland) for periods of 3 and 8 months. The experiments were conducted at both in situ temperature and room temperature to investigate the response of microbial population to elevated temperature. Our results demonstrate that microorganisms from the deep bedrock aquifer benefit from carbon steel introduced to the nutrient poor anoxic deep groundwater environment. In the groundwater incubated with carbon steel the planktonic microbial community was more diverse and 100-fold more abundant compared to the environment without carbon steel. The betaproteobacteria were the most dominant bacterial class in all samples where carbon steel was present, whereas in groundwater incubated without carbon steel the microbial community had clearly less diversity. Microorganisms induced pitting corrosion and were found to cluster inside the corrosion pits. Temperature had an effect on the species composition of microbial community and also affected the corrosion deposits layer formed on the surface of carbon steel. PMID:26257707

  14. Microbially induced corrosion of carbon steel in deep groundwater environment

    Directory of Open Access Journals (Sweden)

    Pauliina eRajala

    2015-07-01

    Full Text Available The metallic low and intermediate level radioactive waste generally consists of carbon steel and stainless steels. The corrosion rate of carbon steel in deep groundwater is typically low, unless the water is very acidic or microbial activity in the environment is high. Therefore, the assessment of microbially induced corrosion of carbon steel in deep bedrock environment has become important for evaluating the safety of disposal of radioactive waste. Here we studied the corrosion inducing ability of indigenous microbial community from a deep bedrock aquifer. Carbon steel coupons were exposed to anoxic groundwater from repository site 100 m depth (Olkiluoto, Finland for periods of three and eight months. The experiments were conducted at both in situ temperature and room temperature to investigate the response of microbial population to elevated temperature. Our results demonstrate that microorganisms from the deep bedrock aquifer benefit from carbon steel introduced to the nutrient poor anoxic deep groundwater environment. In the groundwater incubated with carbon steel the planktonic microbial community was more diverse and 100-fold more abundant compared to the environment without carbon steel. The betaproteobacteria were the most dominant bacterial class in all samples where carbon steel was present, whereas in groundwater incubated without carbon steel the microbial community had clearly less diversity. Microorganisms induced pitting corrosion and were found to cluster inside the corrosion pits. Temperature had an effect on the species composition of microbial community and also affected the corrosion deposits layer formed on the surface of carbon steel.

  15. Microbially induced corrosion of carbon steel in deep groundwater environment.

    Science.gov (United States)

    Rajala, Pauliina; Carpén, Leena; Vepsäläinen, Mikko; Raulio, Mari; Sohlberg, Elina; Bomberg, Malin

    2015-01-01

    The metallic low and intermediate level radioactive waste generally consists of carbon steel and stainless steels. The corrosion rate of carbon steel in deep groundwater is typically low, unless the water is very acidic or microbial activity in the environment is high. Therefore, the assessment of microbially induced corrosion of carbon steel in deep bedrock environment has become important for evaluating the safety of disposal of radioactive waste. Here we studied the corrosion inducing ability of indigenous microbial community from a deep bedrock aquifer. Carbon steel coupons were exposed to anoxic groundwater from repository site 100 m depth (Olkiluoto, Finland) for periods of 3 and 8 months. The experiments were conducted at both in situ temperature and room temperature to investigate the response of microbial population to elevated temperature. Our results demonstrate that microorganisms from the deep bedrock aquifer benefit from carbon steel introduced to the nutrient poor anoxic deep groundwater environment. In the groundwater incubated with carbon steel the planktonic microbial community was more diverse and 100-fold more abundant compared to the environment without carbon steel. The betaproteobacteria were the most dominant bacterial class in all samples where carbon steel was present, whereas in groundwater incubated without carbon steel the microbial community had clearly less diversity. Microorganisms induced pitting corrosion and were found to cluster inside the corrosion pits. Temperature had an effect on the species composition of microbial community and also affected the corrosion deposits layer formed on the surface of carbon steel. PMID:26257707

  16. Integrating Steel Production with Mineral Carbon Sequestration

    Energy Technology Data Exchange (ETDEWEB)

    Klaus Lackner; Paul Doby; Tuncel Yegulalp; Samuel Krevor; Christopher Graves

    2008-05-01

    The objectives of the project were (i) to develop a combination iron oxide production and carbon sequestration plant that will use serpentine ores as the source of iron and the extraction tailings as the storage element for CO2 disposal, (ii) the identification of locations within the US where this process may be implemented and (iii) to create a standardized process to characterize the serpentine deposits in terms of carbon disposal capacity and iron and steel production capacity. The first objective was not accomplished. The research failed to identify a technique to accelerate direct aqueous mineral carbonation, the limiting step in the integration of steel production and carbon sequestration. Objective (ii) was accomplished. It was found that the sequestration potential of the ultramafic resource surfaces in the US and Puerto Rico is approximately 4,647 Gt of CO2 or over 500 years of current US production of CO2. Lastly, a computer model was developed to investigate the impact of various system parameters (recoveries and efficiencies and capacities of different system components) and serpentinite quality as well as incorporation of CO2 from sources outside the steel industry.

  17. Study of the Intercrystalline Corrosion in Pipes of Stainless Steel in a Combined Cycle

    Directory of Open Access Journals (Sweden)

    Raúl Andrés Montejo Serrano

    2014-09-01

    Full Text Available The present work is carried out with the purpose of giving answer to the possible presence ofintercrystalline corrosion and its future consequences in the built tubes of stainless steel 304L anddedicated to the conduction from the water to the boilers of a combined cycle of electricity production.The plant is these in this moments in installation of process investor and assembly and this study wasrequested since during the trial of installation of the pipes of stainless steel that will drive the watertried to the steam generators, they were detected on the part of the operatives some imperfections inthe material, what generated the doubt about the possibility of presence of intercrystalline corrosion orof another type in the pipes. After the realized rehearsals according to international norms and alsousing rehearsals metallography you concludes that the material employee is not sensitive to this typeof corrosion.

  18. Analysis of ultrasound propagation in a steel pipe using ultrasonic pulse doppler method

    International Nuclear Information System (INIS)

    Thermal powers of nuclear reactors are calculated by the enthalpy difference between reactor feed water and main steam. Improvement of the measurement accuracy in the flow rate measurements of reactor feed water enables us to uprate reactor thermal power, called MUR (Measurement Uncertainly Recapture) uprate. The ultrasonic pulse Doppler system is expected to be a suitable method featuring the capability of measuring the flow profile directly in a pipe. For the optimum measurements, ultrasonic path from ultrasonic transducer into the fluid through steel pipe wall should be carefully predicted in high temperature water. This paper presents analytical results of ultrasound propagation using FEM simulation code and experimental results of pipe flow rate at high temperature thermal conditions. (author)

  19. Analysis of ultrasound propagation in a steel pipe using ultrasonic pulse doppler method

    International Nuclear Information System (INIS)

    Thermal powers of nuclear reactors are calculated by the enthalpy difference between reactor feed water and main steam. Improvement of the measurement accuracy in the flow rate measurements of reactor feed water enables us to uprate reactor thermal power, called MUR (Measurement Uncertainly Recapture) uprate. The ultrasonic pulse Doppler system is expected to be a suitable method featuring the capability o measuring the flow profile directly in a pipe. For the optimum measurements, ultrasound path from ultrasonic transducer into the fluid through steel pipe wall should be carefully predicted in high temperature water. This paper presents analytical results of ultrasound propagation using FEM simulation code and experimental results of pipe flow rate at high temperature thermal conditions. (author)

  20. High-energy air shock study in steel and grout pipes

    International Nuclear Information System (INIS)

    Voitenko compressors are used to generate 43 mm/μs air shocks in both a steel and a grout outlet pipe containing ambient atmospheric air. Fiber-optic ports provide diaphragm burst times, time-of-arrival (TOA) data, and velocities for the shock front along the 20-mm-ID exit pipes. Pressure profiles are obtained at higher enthalpy shock propagation than ever before and at many locations along the exit pipes. Numerous other electronic sensors and postshot observations are described, as well as experimental results. The primary objectives of the experiments are as follows: (1) provide a data base for normalization/improvement of existing finite-difference codes that describe high-energy air shocks and gas propagation; (2) obtain quantitative results on the relative attenuation effects of two very different wall materials for high-energy air shocks and gas flows. The extensive experimental results satisfy both objectives

  1. High-energy air shock study in steel and grout pipes

    Energy Technology Data Exchange (ETDEWEB)

    Glenn, H.D.; Kratz, H.R.; Keough, D.D.; Duganne, D.A.; Ruffner, D.J.; Swift, R.P.; Baum, D.

    1979-10-05

    Voitenko compressors are used to generate 43 mm/..mu..s air shocks in both a steel and a grout outlet pipe containing ambient atmospheric air. Fiber-optic ports provide diaphragm burst times, time-of-arrival (TOA) data, and velocities for the shock front along the 20-mm-ID exit pipes. Pressure profiles are obtained at higher enthalpy shock propagation than ever before and at many locations along the exit pipes. Numerous other electronic sensors and postshot observations are described, as well as experimental results. The primary objectives of the experiments are as follows: (1) provide a data base for normalization/improvement of existing finite-difference codes that describe high-energy air shocks and gas propagation; (2) obtain quantitative results on the relative attenuation effects of two very different wall materials for high-energy air shocks and gas flows. The extensive experimental results satisfy both objectives.

  2. The influence of the residual copper on the pipes steel hot plasticity according to environmental requirements

    OpenAIRE

    Rusănescu C.O.; Rusănescu M.

    2013-01-01

    Considering the importance of gaseous and/or liquid fuels impact on the environment, the resistance of pipelines at hot plastic deformation is important. Therefore, in order to avoid or reduce any adverse impact on the environment, the influence of residual copper on hot deformability of steel pipes was investigated in this paper. The negative copper influence was experimentally proved using torsion deformation at temperatures above 1000o, under the air and...

  3. Marine atmospheric corrosion of carbon steels

    International Nuclear Information System (INIS)

    Basic research on marine atmospheric corrosion of carbon steels is a relatively young scientific field and there continue to be great gaps in this area of knowledge. The presence of akaganeite in the corrosion products that form on steel when it is exposed to marine atmospheres leads to a notable increase in the corrosion rate. This work addresses the following issues: (a) environmental conditions necessary for akaganeite formation; (b) characterisation of akaganeite in the corrosion products formed; (c) corrosion mechanisms of carbon steel in marine atmospheres; (d) exfoliation of rust layers formed in highly aggressive marine atmospheres; (e) long-term corrosion rate prediction; and (f) behaviour of weathering steels. Field research has been carried out at Cabo Vilano wind farm (Camarinas, Galicia) in a wide range of atmospheric salinities and laboratory work involving the use of conventional atmospheric corrosion techniques and near-surface and bulk sensitive analytical techniques: scanning electron microscopy (SEM)/energy dispersive spectrometry (EDS), X-ray diffraction (XRD), Mossbauer spectroscopy and SEM/μRaman spectroscopy. (Author)

  4. Marine atmospheric corrosion of carbon steels

    Energy Technology Data Exchange (ETDEWEB)

    Morcillo, M.; Alcantara, J.; Diaz, I.; Chico, B.; Simancas, J.; Fuente, D. de la

    2015-07-01

    Basic research on marine atmospheric corrosion of carbon steels is a relatively young scientific field and there continue to be great gaps in this area of knowledge. The presence of akaganeite in the corrosion products that form on steel when it is exposed to marine atmospheres leads to a notable increase in the corrosion rate. This work addresses the following issues: (a) environmental conditions necessary for akaganeite formation; (b) characterisation of akaganeite in the corrosion products formed; (c) corrosion mechanisms of carbon steel in marine atmospheres; (d) exfoliation of rust layers formed in highly aggressive marine atmospheres; (e) long-term corrosion rate prediction; and (f) behaviour of weathering steels. Field research has been carried out at Cabo Vilano wind farm (Camarinas, Galicia) in a wide range of atmospheric salinities and laboratory work involving the use of conventional atmospheric corrosion techniques and near-surface and bulk sensitive analytical techniques: scanning electron microscopy (SEM)/energy dispersive spectrometry (EDS), X-ray diffraction (XRD), Mossbauer spectroscopy and SEM/μRaman spectroscopy. (Author)

  5. Nanostructure-based Processes at the Carbonizing Steels

    Directory of Open Access Journals (Sweden)

    L.I. Roslyakova

    2015-12-01

    Full Text Available The studies of nanostructure-based processes carburizing steels showed that oxidizing atmosphere when carburizing steel contains along with carbon dioxide (CO2 + C = 2CO molecular and atmospheric oxygen (O2 + 2C = 2CO; O + C = CO released from the carbonate ВаСОз during its thermal dissociation. Intensive formation of CO provides high carbonizing ability of carbonate-soot coating and steel.

  6. Production of high strength pipe steels by the CSP{sup R} thin slab technology

    Energy Technology Data Exchange (ETDEWEB)

    Reip, C.P.; Hennig, W.; Kempken, J.; Hagmann, R. [SMS Demag Aktiengesellschaft, Dusseldorf (Germany)

    2005-07-01

    Compact Strip Production (CSP) thin-slab technology is a highly productive process for the cost-effective production of steel grades with an advanced range of properties in terms of inner quality of the hot strip, its surface formation and the associated technological characteristics. Extensive development work in the past 15 years has optimized the process technology which in turn has expanded the range of steels that can be produced. This paper described the ongoing development work regarding the production of higher-strength, microalloyed pipe steels. The resulting hot strip, due to the associated thickness and the potential pipe diameters, is well suited for HFI-welded pipes. Strength levels of up to grade API X80 can now be realized based on ferrite-pearlite and on very fine-grained, ferrite-bainite hot strip microstructures. This study showed that an 8 mm thick hot strip produced in a CSP plant has very good toughness at temperatures down to -60 degrees C. The material is also suitable for use in sour-gas pipelines according to results of hydrogen-induced cracking tests. 13 refs., 11 figs.

  7. Internal friction in martensitic carbon steels

    Energy Technology Data Exchange (ETDEWEB)

    Hoyos, J.J., E-mail: jjhoyos@unal.edu.co [Grupo de Ciencia y Tecnologia de los Materiales, Universidad Nacional de Colombia, Sede Medellin, Carrera 80 Numero 65-223, Medellin (Colombia); Ghilarducci, A.A., E-mail: friccion@cab.cnea.gov.ar [Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Instituto Balseiro-Universidad Nacional de Cuyo, Consejo Nacional de Investigaciones Cientificas y Tecnologicas, Av. Bustillo 9500, 8400 Bariloche RN (Argentina); Salva, H.R., E-mail: salva@cab.cnea.gov.ar [Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Instituto Balseiro-Universidad Nacional de Cuyo, Consejo Nacional de Investigaciones Cientificas y Tecnologicas, Av. Bustillo 9500, 8400 Bariloche RN (Argentina); Chaves, C.A., E-mail: cachaves@unal.edu.co [Grupo de Ciencia y Tecnologia de los Materiales, Universidad Nacional de Colombia, Sede Medellin, Carrera 80 Numero 65-223, Medellin (Colombia); Velez, J.M., E-mail: jmvelez@unal.edu.co [Grupo de Ciencia y Tecnologia de los Materiales, Universidad Nacional de Colombia, Sede Medellin, Carrera 80 Numero 65-223, Medellin (Colombia)

    2009-09-15

    This paper proposes relationships between the internal friction and the microstructure of two steels containing 0.626 and 0.71 wt.% carbon. The steels were annealed at 1093 K for 5 min, quenched into water and tempered for 10 min at 423, 573 and 723 K. Internal friction was measured by using a forced vibration pendulum, in a temperature range from 100 to 450 K. The internal friction spectrum is decomposed into four peaks: P1 at 215 K, P2 at 235 K, P3 at 260 K and P4 at 380 K for 3 Hz. Peak P1 is attributed to the interactions between dislocations and carbon atoms. Peak P2 is related to the interaction between dislocations and carbide. Peak P3 is related to the generations of kink - pairs along edge dislocations. Peak P4 is attributed to epsilon carbide precipitation.

  8. Ultrahigh carbon steel for automotive applications

    Energy Technology Data Exchange (ETDEWEB)

    Lesuer, D.R.; Syn, C.K. [Lawrence Livermore National Lab., CA (United States); Sherby, O.D. [Stanford Univ., CA (United States)

    1995-12-04

    Ultrahigh carbon steels (UHCSs), which contain 1--2.1% carbon, have remarkable structural properties for automotive application when processed to achieve fine ferrite grains with fine spheroidized carbides. When processed for high room temperature ductility, UHCS can have good tensile ductility but significantly higher strength than current automotive high strength steels. The material can also be made superplastic at intermediate temperatures and exhibits excellent die fill capability. Furthermore, they can be made hard with high compression ductility. In wire form it is projected that UHCS can exhibit extremely high strengths (5,000 MPa) for tire cord applications. Examples of structural components that have been formed from fine-grained spheroidized UHCSs are illustrated.

  9. Internal friction in martensitic carbon steels

    International Nuclear Information System (INIS)

    This paper proposes relationships between the internal friction and the microstructure of two steels containing 0.626 and 0.71 wt.% carbon. The steels were annealed at 1093 K for 5 min, quenched into water and tempered for 10 min at 423, 573 and 723 K. Internal friction was measured by using a forced vibration pendulum, in a temperature range from 100 to 450 K. The internal friction spectrum is decomposed into four peaks: P1 at 215 K, P2 at 235 K, P3 at 260 K and P4 at 380 K for 3 Hz. Peak P1 is attributed to the interactions between dislocations and carbon atoms. Peak P2 is related to the interaction between dislocations and carbide. Peak P3 is related to the generations of kink - pairs along edge dislocations. Peak P4 is attributed to epsilon carbide precipitation.

  10. Ice plugging of pipes using liquid nitrogen

    International Nuclear Information System (INIS)

    This report presents a study on the ice plugging of pipe using liquid nitrogen, and is based on a literature review and on discussions with individuals who use the technique. Emphasis is placed on ferritic alloys, primarily carbon steels, in pipe sized up to 60 cm in diameter and on austenitic stainless steels in pipe sizes up to 30 cm in diameter. This technique is frequently used for leak testing in nuclear facilities

  11. Ultrasonic flaw detection of austenitic stainless steel longitudinally welded pipe and tubing

    International Nuclear Information System (INIS)

    Recently there has been the trend that the welded austenitic stainless steel pipe and tubing are used in the nuclear industry in place of the seamless pipe and tubing. For most of the nuclear components, the pipe and tubing must be examined with ultrasonic method by the demands of ASME SA-655. But the ultrasonic flaw detection of the austenitic welds is generally difficult because of scattering and deflection of the acoustic beam due to the coarse grained and elastically anisotropic preferred oriented structure of dendrite. For the thinner welds of pipe and tubing, the attenuation and deflection of the beam do not make the serious problems, however, the deterioration of the signal-to-noise ratio by the coherent structural noise from the welds may still disturb the flaw detection. The longitudinal wave can be employed to suppress the structural noise. This depends upon its longer wave length. In the automatic examination of the pipe and tubing, however, the customary shear wave angle beam technique must be applied to use the skipped beam

  12. Effect of heat treatments on the hydrogen embrittlement susceptibility of API X-65 grade line-pipe steel

    Indian Academy of Sciences (India)

    G Ananta Nagu; Amarnath; T K G Namboodhiri

    2003-06-01

    Delayed failure tests were carried out on hydrogen charged API X-65 grade line-pipe steel in as received (controlled rolled), normalized, and quenched and tempered conditions. The resistance to hydrogen embrittlement was found in the order of controlled rolled $\\gt$ quenched and tempered $\\gt$ normalized. The fracture mode in the hydrogen embrittled steel was ductile.

  13. Research and development of steel and alloy tubes and pipe for nuclear services

    International Nuclear Information System (INIS)

    This company has been engaged in the research and development of steel and alloy tubes and pipe for nuclear services, among which the results for four products will be described as follows: (1) Zircaloy tubes for nuclear fuel cladding : the improvement of manufacturing and inspection techniques, the research on improvement in quality of the product (corrosion resistance, texture, hydride precipitation characteristics, mechanical properties, etc.), and irradiation test. (2) Steam generator tubes for a high temperature gas cooled reactor for power generating : high temperature strength, structure change, and oxidation resistance and weldability of Fe-32Ni-20Cr-Ti-Al alloy. (3) Heat resistant alloys for heat exchanger tubes in nuclear steel-making : high temperature strength and oxidation resistance of several kinds of heat resistant alloys, and the introduction of newly installed helium circulating loop system for material testing. (4) Ultra-high strength steel pipe for manufacturing equipment of nuclear fuel material : results of research on improvement in quality of 300ksi and 350ksi grade maraging steels. (auth.)

  14. Contamination of stainless steel process piping with radioactive cobalt colloids and methods for decontamination

    International Nuclear Information System (INIS)

    Significant deposits of activity can occur on the internal surface of pipework carrying aqueous radioactive liquid. This paper describes experimental work to contaminate stainless steel piping with colloidal particles of Co60 and considers decontamination methods. The effects on steel contamination of varying cobalt concentration and aqueous liquor pH were investigated. Deposition increased with increasing cobalt concentration and the ''plate-out'' increased markedly with increasing liquid pH. Low deposition occurred at pH ∼ 2 increasing by orders of magnitude at pH ∼ 10. Steel type had an effect on activity picked up. It was shown that liquid turbulence, on the surface, reduced activity deposition. Since the extent of contamination to be removed depends on deposition or ''plate-out'' kinetics, the factors affecting the rate of activity deposition are considered. Specimens of steel piping were treated by contacting with acid, electroetching or abrasion with emery cloth. Surface treatment was shown to delay deposition, in certain instances, but did not have much effect on overall equilibrium level of surface activity. The surface activity could be reduced by treatment with dilute nitric acid: however significant activity remained. Most of the remaining activity could be removed by treatment with nitric acid in an ultrasonic bath. (Author)

  15. Cf Corrosion-fatigue crack growth behavior of piping and reactor pressure vessel steels

    International Nuclear Information System (INIS)

    As test materials, the nuclear-grade steels were selected such as carbon steel 20 (similar to steel C1020) and 22Κ (similar to steels Κ01701 and Κ02401), alloyed steel 15Χ2ΗΜΦΑ (similar to steel Α543), including the metal of the welded joint, as well as stainless steel 08Χ18Η12Τ (similar to steel 321) with the welded joint. The experimental investigations of the regularities of the crack propagation in steels were carried out on two types of specimens: compact tension and flat bending specimens. The report describes special experimental equipment, test methods and results. The experimental complex includes test facilities with the forced circulation and natural circulation loops, as well as 100 degree aqueous medium test facilities using for comparing the results. The effect of basic load variables (load ratio and frequency), temperature (from 80 degree C to 280 degrees) and aqueous medium chemical composition on the nature of fatigue crack propagation was studied. The selection of the aqueous medium was defined by the conventional water-chemistry conditions of WR and WR with due account for the solution pH value and the electrode potential at the propagating crack tip. The comparison is given of the test results with the effective normative specifications. Based on the analysis of test results the generalized characteristics of the corrosion crack resistance of various structural steels are given. (authors)

  16. Hydrogen Effects on Austenitic Stainless Steels and High-Strength Carbon Steels

    OpenAIRE

    Todoshchenko, Olga

    2015-01-01

    The resistance to hydrogen embrittlement is an important factor in the development of new steel grades for a variety of applications. The thesis describes investigations on hydrogen effects on two classes of steels - austenitic stainless steels and advanced high-strength carbon steels. Hydrogen solubility and diffusion in metastable austenitic stainless steels are studied with thermal desorption spectroscopy (TDS). This method, together with the mathematical modeling of the processes of hy...

  17. AE characteristics during stress corrosion cracking of sensitized type 304 stainless steel pipes

    International Nuclear Information System (INIS)

    The objective of this study was to get a better understanding on acoustic emission (AE) characteristics during stress corrosion cracking (SCC) processes of Type 304 stainless steel, to apply AE techniques to detection and monitoring of SCC of the type experienced with stainless steel boiling water reactor piping. SCC tests were performed on pipe specimens with 20 mm inner diameter. Before testing, all pipe specimens were solution-treated and then sensitized. The SCC tests were conducted in the circulating corrosion test equipment containing the pipe specimen under three kinds of bi-axial stresses, of which Mises equivalent stresses were kept at 172 MNm (17.5 kg/mm2). The test conditions were: the test temperature: 2250C; the concentration of chloride ion: approximately 50 ppm; the concentration of dissolved oxygen: approximately 10 ppm; the flow rate of water: 10 l/hr. Main results were: (1) the failure was caused mainly by intergranular stress corrosion cracking; (2) AE characteristics during the SCC test may be divided into three stages; (3) the most probable AE sources in the 3rd stage may be the phenomena due to the propagation of intergranular stress corrosion cracks; (4) the propagation velocity of intergranular stress corrosion cracks seems to become higher, as the hoop stress applied to the pipe specimens increases, even in the cases of the same value of Mises' equivalent stress; and (5) at the leakage due to SCC, cumulative counts, signal waveforms and peak-amplitude distributions shows a great change and the leakage is readily detectable by standard AE techniques. (author)

  18. Effect of intercritical annealing treatment on the mechanical properties of SA106 Gr.C piping steel

    International Nuclear Information System (INIS)

    It is reported that SA106 Gr.C piping steel generally exhibits not enough toughness to apply LBB concept and needs a suitable additional heat treatment to improve the toughness. The intercritical annealing at the (α+γ) phase temperature at 760 deg C for 40 min was performed in this study. To evaluate the improved material properties with the heat treatments, tensile tests were carried out under various temperatures, from RT to 350 deg C, and strain rates, from 1.39x10-4s-1 to 1.39x10-2s-1. Also, Charpy impact tests were conducted to measure impact toughness at room temperature. The manifestations of dynamic strain aging (DSA) were observed in the tensile properties. However, the magnitude of serration and the strength increased by DSA was relatively small compared to similar grade carbon steels. The intercritical annealing was able to increase the impact toughness by 1.5 times compared to as-received material. The dissolved carbon content in the retained ferrite, which was formed at the (α+γ) region, may be lower than that in the transformed ferrite, which was formed at the pearlite transformation temperature. It is considered that the cleaner retained ferrite may have caused the higher impact toughness and ductility in addition to the general toughening due to finer grain sizes, which were resulted from the heat treatment

  19. 76 FR 47555 - Certain Large Diameter Carbon and Alloy Seamless Standard, Line and Pressure Pipe From Japan...

    Science.gov (United States)

    2011-08-05

    ...On April 1, 2011, the Department of Commerce (``Department'') initiated the second sunset reviews of the antidumping duty orders on certain large diameter carbon and alloy seamless standard, line and pressure pipe (``large diameter pipe'') from Japan and certain small diameter carbon and alloy seamless standard, line and pressure pipe (``small diameter pipe'') from Japan and Romania. The......

  20. Protective film formation of carbon steel surfaces for corrosion and deposit control in Heavy Water Plant, Manuguru (Paper No. 1.1)

    International Nuclear Information System (INIS)

    Heavy Water Plant, Manuguru based on H2S-H2O bi-thermal chemical exchange process employs carbon steel as major material of construction for towers and piping. Several different phases of iron sulphide form as a result of interaction between aqueous H2S and carbon steel. Development of a procedure for formation of stable film on carbon steel as a preconditioning step was carried out based on work done by Heavy Water Division and the experiences of HWP, Kota. Heavy Water Plant, Manuguru was designed for carrying protective film formation of entire exchange unit including vessels, tanks, pipings etc. under dynamic conditions. This paper describes the procedure followed for the protective film formation of carbon steel surfaces at HWP, Manuguru. (author). 2 refs., 3 tabs., 2 figs

  1. Numerical study on forming complex fitting body on end of integrated stainless steel pipe without welds

    Institute of Scientific and Technical Information of China (English)

    张大伟; 赵升吨

    2016-01-01

    It is necessary to use the integrated stainless steel pipe having two fitting bodies without welds while train travelling at high speed. In order to form this type of integrated stainless steel pipe, the method of preforming combined finish forming process is developed. The preforming process is characterized by flaring combined upsetting for left fitting body which is like a flange, and is characterized by tube axial compressive process under die constraint for right fitting body which is like a double-wall pipe. The finite element simulations of the processes are carried out by software package DEFORM, and the results indicate that: 1) left or right fitting body can be formed by a two-step forming process without folding and under-filling defects; 2) by using two-step forming, strain and stress in left fitting body are larger than those in right fitting body, and deformation in right fitting body is more homogenous than the deformation in left fitting body; 3) two or more preforming steps may be needed for left fitting body considering the distributions of strain and stress.

  2. Friction stir processing on carbon steel

    Energy Technology Data Exchange (ETDEWEB)

    Tarasov, Sergei Yu., E-mail: tsy@ispms.ru [Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055, Russia and National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation); Melnikov, Alexander G., E-mail: melnikov-ag@tpu.ru [National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation); Rubtsov, Valery E., E-mail: rvy@ispms.ru [Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation)

    2014-11-14

    Friction stir processing of medium carbon steel samples has been carried out using a milling machine and tools made of cemented tungsten carbide. Samples have been machined from 40 and 40X steels. The tools have been made in the shape of 5×5×1.5 mm and 3×3×1.5 mm tetrahedrons. The microstructure of stirred zone has been obtained using the smaller tool and consists of fine recrystallized 2-3 μm grains, whereas the larger tool has produced the 'onion-like' structures comprising hard quenched 'white' 500-600 MPa layers with 300-350 MPa interlayers of bainite needles. The mean values of wear intensity obtained after measuring the wear scar width were 0.02 mm/m and 0.001 mm/m for non-processed and processed samples, respectively.

  3. Friction stir processing on carbon steel

    International Nuclear Information System (INIS)

    Friction stir processing of medium carbon steel samples has been carried out using a milling machine and tools made of cemented tungsten carbide. Samples have been machined from 40 and 40X steels. The tools have been made in the shape of 5×5×1.5 mm and 3×3×1.5 mm tetrahedrons. The microstructure of stirred zone has been obtained using the smaller tool and consists of fine recrystallized 2-3 μm grains, whereas the larger tool has produced the 'onion-like' structures comprising hard quenched 'white' 500-600 MPa layers with 300-350 MPa interlayers of bainite needles. The mean values of wear intensity obtained after measuring the wear scar width were 0.02 mm/m and 0.001 mm/m for non-processed and processed samples, respectively

  4. Polymer concrete lined pipe for use in geothermal applications

    Energy Technology Data Exchange (ETDEWEB)

    Kaeding, Albert O.

    1982-10-08

    A specific polymer concrete formulation was applied as a steel pipe liner in response to a need for durable, economical materials for use in contact with high temperature geothermal brine. Compressive strengths of up to 165.8 MPa and splitting tensile strengths of 23.5 MPa were measured at ambient temperature. Compressive strengths of 24 MPa and splitting tensile strengths of 2.5 MPa were measured at about 150 C. Cost of piping a geothermal plant with PC and PC-lined steel pipe is calculated to be $1.21 million, which compares favorably with a similar plant piped with alloy steel piping at a cost of $1.33 million. Life-cycle cost analysis indicates that the cost of PC-lined steel pipe would be 82% of that of carbon steel pipe over a 20-year plant operating life.

  5. Thermomechanical history measurements on Type 304L stainless steel pipe girth welds

    International Nuclear Information System (INIS)

    Thermal and strain histories were recorded for three 40-cm-diameter (16 inch), Type 304L stainless steel (SS), schedule 40 (1.27 cm thickness) pipe girth welds. Two weld groove preparations were standard V grooves while the third was a narrow groove configuration. The welding parameters for the three pipe welds simulated expected field practice as closely as possible. The narrow gap weld was completed in four continuous passes while the other two welds required six and nine (discontinuous) passes, due to the use of different weld wire diameters. Thermomechanical history measurements were taken on the inner counterbore surface, encompassing the weld centerline and heat-affected zone (HAZ), as well as 10 cm of inner counterbore surface on either side of the weld centerline; a total of 47 data acquisition instruments were used for each weld. These instruments monitored: (1) weld shrinkages parallel to the pipe axis; (2) surface temperatures; (3) surface strains parallel to weld centerline; and (4) radial deformations. Results show that the weld and HAZ experienced cyclic deformation in the radial direction during welding, indicating that the final residual stress distribution in multi-pass pipe weldments is not axisymmetric. Measured radial and axial deformations were smaller for the narrow gap groove than for the standard V grooves, suggesting that the narrow gap groove weldment may have lower residual stress levels than the standard V groove weldments. This study provides the experimental database and a guideline for further computational modeling work

  6. High-energy (Mach 130) air-shock propagation in steel and grout pipes

    Energy Technology Data Exchange (ETDEWEB)

    Glenn, H.D.; Kratz, H.R.; Keough, D.D.; Swift, R.P.

    1979-02-28

    Voitenko compressors have been used to generate approx. 45-mm/..mu..s air shocks in a steel and a grout outlet pipe. Fiber-optic ports were used to measure diaphragm burst times and time-of-arrival data for shock-front luminosity along the 20-mm-ID exit pipes. Pressure profiles were obtained at higher enthalpy shock propagation than ever before and at many locations along the tubes. The grout experiment is the first laboratory attempt to study air shock propagation in a pipe with this type of compressible wall material. The primary purpose of these two experiments was to examine the effect of wall material on high-energy shock propagation. In the interval between 0.10 and 2.50 m from the diaphragm, the velocity and peak pressure of the shock front attenuated from approx. 45 to approx. 5 mm/..mu..s and from approx. 3.5 to approx. 0.02 GPa, respectively. Over this distance, the shock propagation was nearly identical in both experiments. The rapid attenuation of the shock front velocity and pressure is attributed to ablation and entrainment of wall material. An interesting feature, confirmed by multiple measurement techniques, was a rapid oscillation in the pressure profiles. The results indicate that, for the materials considered, shock propagation is independent of wall composition over the 2.5-m length of the outlet pipes.

  7. 76 FR 15299 - Certain Hot-Rolled Carbon Steel Flat Products From India: Preliminary Rescission of...

    Science.gov (United States)

    2011-03-21

    ...), or both, added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels with...) steels, and the substrate for motor lamination steels. IF steels are recognized as low carbon steels with... FR 74682 (December 1, 2010). On January 3, 2011, we received from United States Steel Corporation,...

  8. Fabrication of carbon-carbon heat pipes for space nuclear power applications

    International Nuclear Information System (INIS)

    This paper reports that significant advancements have been made in the development of lightweight, high performance, carbon-carbon heat pipes for space nuclear power applications. The subject program has progressed through the concept definition and feasibility analysis stages to the current test article component fabrication and assembly phase. This concept utilizes a carbon-carbon tube with integrally woven fins as the primary structural element and radiative surface, Nb-1Zr liners to contain a potassium working fluid, and welded end caps and fill tubes. Various tests have been performed in the development of suitable liner bonding techniques and in the assessment of material stability

  9. Investigation of Residual Stress Distributions of Induction Heating Bended Austenitic Stainless Steel (316 Series) Piping

    International Nuclear Information System (INIS)

    The induction heating bending process, which has been recently applied to nuclear piping, can generate residual stresses due to thermomechanical mechanism during the process. This residual stress is one of the crack driving forces that have important effects on crack initiation and propagation. However, previous studies have focused only on geometric shape variations such as the change in thickness and ovality. Moreover, very few studies are available on the effects of process variables on residual stresses. This study investigated the effects of process variables on the residual stress distributions of induction heating bended austenitic stainless steel (316 series) piping using parametric finite element analysis. The results indicated that the heat generation rate and feed velocity have significant effects on the residual stresses whereas the moment and bending angle have insignificant effects

  10. A study of ceramic-lined composite steel pipes prepared by SHS centrifugal-thermite process

    Directory of Open Access Journals (Sweden)

    Li Yuxin

    2016-01-01

    Full Text Available Al2O3 ceramic-lined steel pipe was produced by self-propagating high-temperature synthesis centrifugal thermite process (SHS C-T process from Fe2O3 and Al as the raw materials. The composition, phase separation and microstructures were investigated. The result showed the ceramic lined pipe is composed of the three main layers of various compositions, which were subsequently determined to be Fe layer, the transition layer and the ceramic layer. Fe layer is composed of austenite and ferrite, the transition layer consisted of Al2O3 ceramic and Fe, the ceramic layer consisted of the dendritic-shaped Al2O3 and the spinel-shaped structured FeAl2O4.

  11. Test Of Protective Coatings On Carbon Steel

    Science.gov (United States)

    Macdowell, Louis

    1993-01-01

    Report describes results of tests in which carbon-steel panels coated with one-or two-component solvent-based inorganic zinc primers and top-coated with inorganic topcoat or any of various organic topcoats, placed on outdoor racks at beach at Kennedy Space Center for 5 years. From time to time, slurry of Al(2)O(3) in 10-percent HCI solution applied to some of panels to simulate corrosive effect of effluent from solid-fuel rocket booster engines. Panels coated with inorganic topcoat performed much better than organic-topcoated panels.

  12. Passivation of carbon steel through mercury implantation

    Science.gov (United States)

    Wilbur, P. J.; Robinson, R. S.

    1981-01-01

    An experiment, in which carbon steel samples were implanted with mercury ions from a broad beam ion source and their corrosion characteristics in air were evaluated, is described. Mercury doses of a few mA min/square cm at energies of a few hundred electron volts are shown to effect significant improvements in the corrosion resistance of the treated surfaces. In a warm moist environment the onset of rusting was extended from 15 min. for an untreated sample to approximately 30 hrs. for one implanted at a dose of 33 mA min/square cm with 1000 eV mercury ions.

  13. Microbially influenced corrosion of carbon steels

    Energy Technology Data Exchange (ETDEWEB)

    White, D.C.; Jack, R.F.; Dowling, N.J.E.; Franklin, M.J.; Nivens, D.E.; Brooks, S.; Mittelman, M.W.; Vass, A.A. (Tennessee Univ., Knoxville, TN (USA). Inst. for Applied Microbiology); Isaacs, H.S. (Brookhaven National Lab., Upton, NY (USA))

    1990-01-01

    Microbially influenced corrosion of pipeline steels is an economically important problem. Microbes form tubercles which block fluid flow and can facilitate localized corrosion leading to through-wall penetrations. Microbes of diverse physiological types and metabolic potentialities have been recovered from fresh tubercles or under-deposit corrosion and have been characterized. In tests utilizing sterilizable flow-through systems containing pipeline steel coupons, corrosion rates determined by nondestructive electrochemical means have indicated that increasing the number of physiological types of microbes inoculated into the system generally increased the severity of the microbially influenced corrosion (MIC). This study reports the MIC of monocultures and combinations of monocultures in an aerobic fresh water system with low sulfate and an anaerobic saline system. In both the aerobic and anaerobic systems, the combination of microbes induced greater MIC responses than the monocultures. In tests involving a combination of microbes in both systems in which one member was a sulfate-reducing bacteria (SRB), the corrosion mechanism was different for the control and the monocultures. This difference was indicated by the phase shift in the electrochemical impedance spectra (EIS). The localization of corrosion, that in many cases is the hallmark of MIC, may be initiated by the inhomogeneities of supposedly smooth metal surfaces. The scanning vibrating electrode technique (SVET) demonstrated non-uniform current densities over carbon steel electrodes polished to a 600 grit finish suggesting pitting and repassivation of pits in sterile medium.

  14. Intergranular corrosion resistance of 304 stainless steel welded junctions for BWR piping

    International Nuclear Information System (INIS)

    Intergranular corrosion of stainless steel pipings has been noticed in welded areas in almost every boiling water nuclear power plants so as to attract the attention of safety authorities. The research activity developed during more than one decade allowed to apply and qualify a series of provisions aiming at assuring the tensio-corrosion resistence and satisfying the strigent limitations imposed by control authorities. Results achieved by ENEL in cooperation with CISE concerning the study of origin materials, made on mockups of 4'' to 8'' welded tubings and weldings of BWR plants

  15. The influence of the residual copper on the pipes steel hot plasticity according to environmental requirements

    Directory of Open Access Journals (Sweden)

    Rusănescu C.O.

    2013-01-01

    Full Text Available Considering the importance of gaseous and/or liquid fuels impact on the environment, the resistance of pipelines at hot plastic deformation is important. Therefore, in order to avoid or reduce any adverse impact on the environment, the influence of residual copper on hot deformability of steel pipes was investigated in this paper. The negative copper influence was experimentally proved using torsion deformation at temperatures above 1000o, under the air and argon atmosphere. The samples were heated and then deformed at different temperatures with constant deformation rate. Also, structural analysis of investigated materials was done, using metallographic and SEM analysis.

  16. Corrosion rate of carbon steel in NS tank water

    International Nuclear Information System (INIS)

    Neutron shield tank (NST) is an open tank 12.5 meters in height and 12 meters dia constructed around the research reactor. It is filled with water to (i) provide shielding from the neutron radiation, (ii) to remove the heat from the Pressure suppression system during LOCA and (iii) to act as a heat sink. NST is made of IS2062 carbon steel and it contains the stainless steel tanks, CS support structures, forged carbon steel gas cylinders, steel containment and its supports and emergency cooling down system condensers made of ASTM 350 grade LF2 carbon steel. All the equipments/systems located inside NST are painted with epoxy paint. NST is filled up 12 meters ie with 1200 m3 of water. The water chemistry parameters and microbiological parameters and corrosion rate of carbon steel materials in NST water at various water chemistry and various depths are discussed in the paper. (author)

  17. Postservice examination of weld discontinuities in large diameter stainless steel piping

    International Nuclear Information System (INIS)

    Metallurgical examination of pipe-to-pipe weld regions in large-diameter pipe removed from nuclear reactor service has revealed the presence of small fusion zone (FZ) discontinuities. The pipe was fabricated in the 1950's from AISI Type 304 stainless steel and welded using Type 308 filler material. The objectives of the investigation were to characterize discontinuities in weld FZ, determine the mechanisms of formation, establish the tendency for in-service propagation, and to assess the impact of FZ discontinuities on mechanical properties and service life. To accomplish this, UT and Pt were performed in weld areas to identify discontinuities and their location. Coupons were cut for metallography, optical microscopy, and, as necessary, electron microscopy (scanning electron microscopy/energy-dispersive spectroscopy [SEM/EDS]). Discontinuities which were observed in the FZ included one case of IGSCC propagation, lack-of-penetration (LOP), lack-of-fusion (LOF), underfill at the weld root, microfissures, and inclusions. Some of the discontinuities, such as microfissures, were found to have been extended by a crevice corrosion mechanism, predominantly when in fully duplex (austenite/δ ferrite) microstructures. When discontinuities such as LOF bridged austenitic and duplex structures and were open to the ID, some cracks were extended by intergranular stress corrosion, especially in the austenitic HAZ, where some grain dropping occurred. This work showed that the weld discontinuities were generally present from the time of fabrication and were most frequent in near-ID surface regions. Only those discontinuities which were open to the ID surface showed any propagation, but they did not impact the service life or structural integrity of the piping. Therefore, the in-service inspection program should continue to concentrate on IGSCC in the weld HAZ regions

  18. Effect of prestrain on ductility and toughness in high strength line pipe steels

    Energy Technology Data Exchange (ETDEWEB)

    Shinohara, Y.; Besson, J. [Paristech, Evry (France). Centre des Materiaux, Mines Paris; Madi, Y. [Ecole d' Ingenieurs, Sceaux (France). Ermess EPF; Paristech, Evry (France). Centre des Materiaux, Mines Paris

    2009-07-01

    The anisotropic plasticity, ductility and toughness of an X100 steel pipeline was investigated both before and after a series of prestraining experiments. The aim of the study was to determine the effect of prestraining on ductility and toughness in high strength pipe steels. Results of the study showed that primary void growth and coalescence was dependent on initial plastic anisotropy and not dependent on tensile prestrain. Secondary void nucleation and growth was not influenced by either the initial plastic anisotropy or by prestraining. Scanning electron microscopy (SEM) studies showed that the main damage mechanism was the void growth of primary dimples. Dimples in the prestrained materials were larger than those observed in materials that had not been prestrained. However, the effect on prestrain on dimple size was limited. Results showed both plastic and rupture anisotropies. It was concluded that prestraining induces a decrease in ductility, but has a significant impact on toughness. 4 refs., 2 tabs., 12 figs.

  19. A 3D finite element analysis of temperature and stress fields in girth welded 304L stainless steel pipe

    International Nuclear Information System (INIS)

    A 3D finite element analysis model was developed to simulate a multipass, narrow gap pipe girth welding process. The pipe simulated was a Type 304L stainless steel pipe with a diameter of 406 mm, a thickness of 12.7 mm, and a narrow groove configuration. This pipe was finished in four continuous welding passes with one start-stop position. Temperatures, deformations and strains were recorded in real time during pipe welding. The thermal results from this model were tuned to match the calculated temperature histories with the comparable experimental thermal cycles. The calculated temperature histories were found to be axisymmetrically distributed around the pipe except in locations close to the welding start-stop position. This is in good agreement with what was observed from the experimental data. The calculated stress results show that the tensile residual stress zone on the pipe inner surface is about 30 mm from the weld centerline on each side and the tensile residual stress zone in the pipe wall thickness is about 5 mm from the pipe inner surface for up to 19 mm from the weld centerline (WCL). The calculated residual stresses are, in general, axisymmetrically distributed around the pipe except in locations near the welding start-stop position. This is not in agreement with what was noted from the experimental results. The comparison between the calculated stress results with the limited neutron diffraction residual stress measurements on the pipe inner surface demonstrates reasonable agreement between them. This 3D model is the first attempt at simulation of a full multipass girth pipe welding process. Much improvement could be realized, but more experimental residual stress measurements on pipe weldments are needed to verify this model

  20. RESEARCH OF INFLUENCE OF THE HIGH-SPEED THERMAL PROCESSING REGIMES ON STRUCTURE AND MECHANICAL PROPERTIES OF PIPE STEEL 32G2

    Directory of Open Access Journals (Sweden)

    A. I. Gordienko

    2012-01-01

    Full Text Available Researches on influence of high-speed heating temperature, regimes of cooling and temperature of abatement on structure and mechanical properties of pipe steel 32G2 are carried out. Recommendations on the regimes of high-speed thermal processing of steel 32G2 which can be used at manufacturing of seamless pipes are given.

  1. Effect of aging on the predicted maximum moment-carrying capacity of circumferentially cracked cast stainless steel pipe

    International Nuclear Information System (INIS)

    Cast stainless steel used in LWR primary system components such as valve bodies, pump castings, pipe fittings, and piping is susceptible to thermal embrittlement at reactor operating temperatures, 280-320 C (536-608 F). This process of thermal aging causes an increase in the hardness and ultimate tensile strength of the steel, and at the same time a decrease in toughness. Work at Argonne National Laboratories (ANL) has shown that such thermal embrittlement due to changes in the microstructure can occur during the reactor lifetime of 40 years. The effect of this thermal degradation on the load- carrying capacity of circumferentially cracked piping is the subject of this work. In this study, both lower-bound and typical values of the J-R curves and the tensile properties for CF8M and CF8A cast stainless steels, which have been artificially aged to simulate 4, 8, 16, 32, and 48 years of service at 300 C (572 F), were used to predict the maximum load-carrying capacity of circumferentially cracked pipes. The effect of aging, that is, reduced toughness and increased strength, for different pipe diameters, crack geometries [i.e., through-wall cracks (TWC) and surface cracks (SC)], and crack sizes has been investigated. Since complete stress-strain curve fits as a function of aging were not available at this time, only three analyses methods could be used. The three analyses methods used to estimate the maximum load-carrying capacity of cracked pipes were: (1) a J-estimation scheme for TWC pipes developed by Paris, (2) a Plastic-Zone-Screening Criteria (DPZP) developed at Battelle which is applicable to both TWC and SC pipe, and (3) the R6 Option 1 method developed by CEGB which is also applicable for both TWC and SC pipe

  2. Development of the ultrasonic technique for examination of centrifugally-cast stainless steel in pressure piping

    International Nuclear Information System (INIS)

    Centrifugally - cast stainless steel (CCSS) are used to manufacture a large variety of components in the nuclear industry. Weldments are also made to join these parts to carbon steel items. These welds are usually made of stainless steel or inconel alloys. CCSS is sophisticated material and justification for its use in critical components is safety and reliability. These steels, as any other materials, need to be inspected to assess their structural integrity. Ultrasonic testing is one of the possible techniques. In some cases it is the only one of the feasible methods for this examination. This mainly concerns components in the primary and auxiliary circuits of nuclear plants. For a long time it has been recognized that CCSS items can be extremely difficult to inspect using ultrasonics. Many attempts in various research laboratories were conducted to improve the testing technique

  3. Elastic-plastic failure assessment of cold worked stainless steel pipes

    International Nuclear Information System (INIS)

    The change in fracture strength due to cold working was investigated for cracked stainless steel pipes. The cold working was introduced into Type 316 stainless steel plates. Then, material properties were identified in order to make elastic–plastic fracture assessments for a pipe with a circumferential crack under bending load. The two-parameter method was employed for deriving fracture strength considering the change in the flow stress (yield and ultimate strengths), fracture toughness and stress–strain curve caused by the cold working. It was found that the fracture strength was not reduced even if 40% cold working was introduced, while the failure mode was altered from the plastic collapse mode to the elastic–plastic failure mode. Although cold working decreased the fracture toughness, the change in the stress–strain curve reduced the driving force for fracture (J-integral) and increased the fracture strength. It was shown that the failure assessment curve of cold worked material can be derived using the yield and ultimate strengths of the material that is free of cold working

  4. Automatic testing for weld of steel pipe; Kokan yosetsubu kensa no jidoka / inline ka

    Energy Technology Data Exchange (ETDEWEB)

    Yamaguchi, H. [Sumitomo Metal Industries Ltd., Osaka (Japan)

    1998-09-05

    Computer and artificial intelligence (AI) have used in the manufacturing process of steel pipes and process continuation and automation are carried out. Particularly, even the experienced technology of the site can be programmed in the control computer. With the continuation and automation of manufacturing process, most of the nondestructive tests are carried out in line or on the table and highly precise and speedy flow detection have been possible due to the general effect of performance upgrading of testing equipments and its surrounding technology (exchange of step for each size, setting of flow sensitivity) and so forth. Promotion of automation and in line process of nondestructive test is to achieve high precision and high efficiency like reduction of distribution of results by manual operation, reduction of testing time and so forth. As for the testing of weld of steel pipe of present company, the latest technology along with the continuation, automation, reduction of manpower have been considered in its testing device. Further, technological improvement by developing extremely small sensor, high efficiency and so forth is expected. 4 refs., 5 figs., 1 tab.

  5. Survey report on unmanned site welding of austenitic stainless steel pipe and its ultrasonic examination

    International Nuclear Information System (INIS)

    In the field welding of austenitic stainless steel pipings and its non-destructive test in complicated and narrow places, reliable welding method and non-destructive testing method are required, and also, it is desirable to mechanize them (unmanned operation). In this study, the present state of the automatic welding of austenitic stainless steel pipings and ultrasonic flaw detection was investigated through the literatures in Japan and foreign countries. As the result, it was clarified that energetic research has been made recently to mechanize the welding, and though many points are left for future research and development, it is promising. In the ultrasonic flaw detection, many technical problems concerning the detectability of flaws remain at present, but is is expected to become feasible by future systematic research and development. The design of weld joints, the welding method and the remote automatic control of welding operation must be appropriate for guaranteeing the quality of welding, and these points were surveyed. The problems in the ultrasonic flaw detection are the attenuation of ultrasonic waves, the conditions of probes, the mode of wave motion and frequency, and the welding suitable to the ultrasonic flaw detection. (Kako, I.)

  6. Analysis on the deviation of feeder pipe ultrasonic thickness-measuring data

    International Nuclear Information System (INIS)

    This paper is an analysis on the large deviation of feeder ultrasonic thickness-measuring data in Qinshan NPP III, through which the influence of the inner surface of thin wall carbon steel pipe on ultrasonic thickness measurement accuracy is verified and a principle for selection of a thickness measuring probe for thin wall carbon steel pipe with rough inner surface is introduced. (author)

  7. Research on the Electrochemical Corrosion Behavior of Carbon Steel Pipe Welded Joint%碳钢管线焊接接头的电化学腐蚀行为研究

    Institute of Scientific and Technical Information of China (English)

    李维锋; 韩永典; 路永新; 孙紫麾; 陈英; 舒欣欣; 许威; 杨鹏; 毛晓军; 杨寿海; 徐连勇

    2015-01-01

    母材选用 A106B 管线钢,焊丝选用2.4 mm 的实芯焊丝 ER70S-G,使用两种焊接工艺(GTAW+SMAW和GTAW)进行钢管对接焊,试样焊接前后均无热处理。通过对焊接接头的焊缝、热影响区和母材的极化曲线测量,研究了两种焊接工艺所得焊接接头各区域的腐蚀行为。结果表明,两种接头不同区域的耐蚀性为:母材>热影响区>焊缝。%In this article, it used two kinds of welding process (GTAW+SMAW and GTAW)to carry out butt welding for A106B pipeline steel, selecting 2.5 mm solid core welding wire of ER70S-G, without heat treatment for test sample before and after welding. Through polarization curve measurement for welded joint weld, HAZ and base metal, the corrosion behavior of welded joints various regions under two welding process were studied. The results showed that the corrosion resistance of two kinds of welded joints various regions are as follows:the base metal>HAZ>weld.

  8. Carbon steel protection in G.S. [Girldler sulphide] plants: Pt. 8

    International Nuclear Information System (INIS)

    In order to protect carbon steel of towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturated aqueous solutions of hydrogen sulphide forms iron sulphide scales. In oxygen free solutions, evolution of corrosion follows the sequence mackinawate → cubic ferrous sulphide → troilite → pyrrotite → pyrite. Scales formed by pyrrotite and pyrite are the most protective layers (these are obtained at 130 deg C, 2 MPa for a period of 14 days). Pyrite formation is favoured by an oxidizing agent presence that allows the oxidation of sulphur ions to disulphur ions. Elemental sulphur or oxygen were used as oxidating agents. Variation and operational parameters such as concentration, temperature, pH, aggregate time, etc. were studied. Though little improvement on protective scales quality was observed, results do not justify operational troubles and the additional costs and effort involved. (Author)

  9. Effects of solution chemistry and flow on the corrosion of carbon steel in sweet production

    Energy Technology Data Exchange (ETDEWEB)

    Herce, J.A.; Wright, E.J.; Efird, K.D.; Boros, J.A.; Hailey, T.G. [Exxon Production Research Co., Houston, TX (United States)

    1995-10-01

    The corrosion rate of AISI 1018 carbon steel was measured over a range of temperatures, CO{sub 2} partial pressures, flow rates, and solution chemistry under turbulent pipe flow conditions. The combined effects of CO{sub 2} partial pressure, ionic strength, temperature, and initial bicarbonate ion concentration, i.e., solution chemistry, may be described by a single variable, pH. The effects of flow can be combined with pH to form a new variable, hydrogen ion flux, to describe the overall effect of solution chemistry and flow on the sweet corrosion of a film free carbon steel surface. Sweet corrosion rates are directly proportional to hydrogen ion flux over a wide range of temperatures and solution pH`s. Finally, the separate effects of dissolved iron and chloride ion concentration are described.

  10. Basic studies on carbon steel decontamination

    International Nuclear Information System (INIS)

    The dissolution of magnetite films grown in autoclave at high temperature on carbon steel has been performed in a dynamic loop in ammoniated citric and oxalic acid solutions at two different temperatures and constant pH. The dissolution process seems to be affected by the dual-layer oxide morphology depending on the growth conditions in the autoclave. The open-circuit potential of the specimens and the corrosion rate measured by the linear polarization method have been monitored. To this aim a particular corrosion cell and a suitable reference electrode have been set up at CISE. Polarization curves have been performed to check the electrochemical processes involved in the anodic and cathodic area. At last the effect of a corrosion inhibitor, of a complexing and a reducing agent and of temperature has also been studied. The work was carried out in the frame of a CNEN research programme for the development of the CIRENE prototype

  11. Strength enhancement possibilities of low carbon steels

    Directory of Open Access Journals (Sweden)

    M. Greger

    2006-08-01

    Full Text Available Purpose: The paper analyses methods of grain refinement and demonstrates development of structure andproperties of metallic materials after severe plastic deformations (SPD.Design/methodology/approach: Technology ARB was experimentally verified. The material was rolled in 11passes. Rolling proceeded at temperature 650˚C, with heating in furnace with inert atmosphere (Ar.Findings: True strain has achieved the value 9. Basic relations between magnitude of deformation, grainrefinement and resulting mechanical properties were described. Bonding of degree was greater than 90%.Practical implications: ARB method is one of instrument for acquirement materials with ultrafine grainstructure. Is it very simply apparatus, which can be used in practical technology (classical rolling mill.Originality/value: Development of structure was verified on low carbon steel. Obtained grain size was around 0.3 μm.Properties obtained by tensile test did not achieve the expected value. Grain size was homogenous in whole volume.

  12. 76 FR 60083 - Carbon and Alloy Seamless Standard, Line, and Pressure Pipe From Japan and Romania

    Science.gov (United States)

    2011-09-28

    ... pipe from Romania. Background The Commission instituted these reviews on April 1, 2011 (76 FR 18251) and determined on July 5, 2011 that it would conduct expedited reviews (76 FR 44608, July 26, 2011... COMMISSION Carbon and Alloy Seamless Standard, Line, and Pressure Pipe From Japan and Romania...

  13. Stress-corrosion crack initiation behavior of carbon steel in simulated BWR environment

    International Nuclear Information System (INIS)

    Carbon steels and low-alloy steels are said to possess, even though susceptible to stress-corrosion cracking themselves, conspicuously longer life than weld-sensitized Type 304 stainless steels in actual boiling water reactor (BWR) primary coolant environments of high-temperature, high-purity water containing some dissolved oxygen. This has been examined for a carbon steel pipe material and its weld by conducting uniaxial constant-load tests as a laboratory accelerated test. By statistically analyzing the distribution of stress-corrosion cracking lifetimes and metallographical examining the features of stress-corrosion crack initiation in an SEM, following results have been obtained: (1) the stress-corrosion cracking lifetime obeys the exponential distribution model; (2) stress-corrosion cracks are initiated at the bottom of corrosion pits, and it appears possible to analyze their initiation conditions in terms of stress-intensity calculated regarding the pit as a sharp crack; (3) the microcracks as initiated at the corrosion pit are non-propagative per se, so that it is only when they have grown into a main crack by coalescence with nearby microcracks that steady propagation becomes possible; and (4) both the process of pit initiation and that of microcrack coalescence can be described as a Poisson stochastic process just as for the stainless steels in the same environment, so that the whole process of stress-corrosion crack initiation can be conceived as consisting of these two independent Poisson stochastic processes connected in serial succession

  14. Progress and teachings of stress corrosion cracking of low-carbon stainless steels used in BWR NPP (4)

    International Nuclear Information System (INIS)

    In the structural integrity evaluations of low-carbon stainless- or austenitic steel- made shrouds and primary loop recirculation (PLR) pipes used in Boiling Water Reactor Nuclear Power Plants, the stress corrosion crack propagation rates (crack depth) near shroud and near PLR pipe weld joints are assessed from the welding residual stress distribution obtained by the finite element method and by mockup testing, respectively. The structural integrity is evaluated by the plastic and the elastic-plastic fracture mechanics evaluation methods, respectively. (K. Kato)

  15. Material properties of a dissimilar metal weld Inconel 600/ Inconel 82 weld filler/ Carbon Steel (Gr.106 B)

    International Nuclear Information System (INIS)

    Inconel 600 pipes welded to Carbon-Steel are used in CANDU nuclear reactors. Fracture of these welded pipes has important consequences in term of safety, and therefore their mechanical properties need to be better understood. In this study, the weld region was analyzed at various length-scales using optical microscopy, micro hardness testing, small and large scale tensile testing, and Digital Image Correlation (DIC). Micro-hardness profiles showed variations across the weld and through thickness and were justified in terms of residual stresses. Local stress-strain curves were built using DIC and showed good agreement with stress-strain curves obtained from miniature tensile samples. (author)

  16. Stress corrosion cracking tests for low carbon stainless steels with work hardened layer

    International Nuclear Information System (INIS)

    To avoid introduction of Cr depletion at grain boundaries by welding process, low carbon stainless steels (SSs) were used in corrosive environment as one of countermeasures for Stress Corrosion Cracking (SCC). Recently, it is reported that SCCs were introduced at portion with work hardened layer although low carbon SSs had been used at core shrouds and primary loop recirculation piping in Boiling Water Reactors. To simulate and examine the phenomenon, mechanical working, metallographic observation, hardness test and SCC tests in chloride solutions were conducted for low carbon SSs. From the results of metallographic observation and hardness test, it was confirmed that slip bands were observed around the surface and hardened layer was introduced by mechanical working. From the results of SCC tests, it was noticed that cracks which introduced from the surface, had grown into the matrix. It is thought that low carbon SSs with work hardened layer have susceptibility to SCC from the above. (author)

  17. Neutron diffraction residual stress measurements on girth-welded 304 stainless steel pipes with weld metal deposited up to half and full pipe wall thickness

    International Nuclear Information System (INIS)

    The residual stress distribution has been measured in two girth-welded austenitic stainless steel pipe weldments using time-of-flight neutron diffraction. One had weld filler metal deposited up to half the pipe wall thickness, and one had weld metal deposited up to full pipe wall thickness. The aim of the work is to evaluate the evolution in residual stress profile on filling the weld, on which there is little experimental data, and where the selection of the correct hardening model used in finite element modelling can benefit greatly from an understanding of the intermediate residual stresses partway through the welding operation. The measured residual stresses are compared with those calculated by finite element modelling and measured using X-ray diffraction. The results show a change in the measured hoop stress at the weld toe from tension to compression between the half- and fully-filled weld. The finite element results show an overprediction of the residual stress, which may be a consequence of the simple isotropic hardening model applied. The results have implications for the likely occurrence of stress corrosion cracking in this important type of pipe-to-pipe weldment. Highlights: ► 304 steel girth welded with weld metal to half and full pipe wall thickness. ► Residual stresses measured by neutron and X-ray diffraction, and modelled by FE. ► Weld toe residual σhoop changes from tensile to compressive from half to fully-filled. ► FE model for the fully-filled weld gives higher stress levels than those measured. ► Discrepancy is attributed to the isotropic hardening model used.

  18. Influence of the pH and Temperature on Carbon Steel in the Secondary System of Nuclear Power Plants

    International Nuclear Information System (INIS)

    The broken pipes events occurred in the Surry unit 2 nuclear power plant in USA at 2004 and the Mihama unit 3 nuclear power plant in Japan at 1986 caused many casualties. It is mainly generated in the carbon steel pipe of the single-phase or two-phase. Also, most important influential factors of the FAC are known to be flow rate of the fluid, flow, pH, temperature, material contents and shape of the piping. The FAC is caused by the interaction of hydraulics factors and water chemistry factors. It can be mitigated effectually by the control of influential factors. In this study, the corrosion rate influenced by pH and temperature is evaluated in the single-phase by using the secondary system of power plant carbon steel. In this study, the pH and temperature effects on the carbon steel used in nuclear power plant secondary system were evaluated. Most effective factor on the corrosion rate is a solubility of magnetite and hematite produced by reaction between carbon steel and oxygen. The solubility of magnetite and hematite decreases for increasing pH, and it shows the highest value at 150 .deg. C temperature condition and decreases for higher temperature condition than 150 .deg. C. In this study, the experimental tests were performed for nuclear power plant operating condition of high temperature water chemistry environment using carbon steel specimen and static autoclave. The test results are showing consistent with the magnetite solubility trend. The static autoclave test is not able to consider the FAC phenomenon completely

  19. 76 FR 49437 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results of Antidumping Duty...

    Science.gov (United States)

    2011-08-10

    ..., natural gas, and other liquids and gases in plumbing and heating systems, air conditioning units... Circumstances Review: Certain Circular Welded Non-Alloy Steel Pipe From Mexico, 75 FR 82374 (December 30, 2010... Venezuela and Amendment to Final Determination of Sales at Less Than Fair Value: Certain Welded...

  20. 75 FR 68324 - Certain Stainless Steel Butt-Weld Pipe Fittings From Japan, South Korea and Taiwan; Final Results...

    Science.gov (United States)

    2010-11-05

    ... Fittings from Japan, South Korea, and Taiwan; Continuation of Antidumping Duty Orders, 70 FR 61119 (October... Fittings From Japan, South Korea, and Taiwan, 65 FR 5604 (February 4, 2000). On September 1, 2010, the... International Trade Administration Certain Stainless Steel Butt-Weld Pipe Fittings From Japan, South Korea...

  1. 77 FR 18266 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Revised...

    Science.gov (United States)

    2012-03-27

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Revised... the conduct of the expedited subject five- year reviews (77 FR 10773, February 23, 2012)....

  2. 75 FR 44763 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico; Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2010-07-29

    ... and Request for Revocation in Part, 74 FR 68229 (December 23, 2009). The current deadline for the... International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico; Extension of Time... Department) received a timely request from domestic interested parties Allied Tube and Conduit...

  3. 76 FR 66899 - Certain Circular Welded Non-Alloy Steel Pipe From Brazil, Mexico, the Republic of Korea, and...

    Science.gov (United States)

    2011-10-28

    ...-Alloy Steel Pipe and Tube from Mexico, 74 FR 41681 (August 18, 2009). \\3\\ The Department found that Yieh... (``Sunset'') Review, 76 FR 38613 (July 1, 2011) (Notice of Initiation). The Department received a notice of... Circumstance Review, 70 FR 71802 (November 30, 2005). This notice also serves as the only reminder to...

  4. 78 FR 78336 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results and Partial...

    Science.gov (United States)

    2013-12-26

    ...: Certain Circular Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992). Notification to..., 77 FR 77017 (December 31, 2012). DATES: Effective Date: December 26, 2013. FOR FURTHER INFORMATION... Assessment Rate in Certain Antidumping Duty Proceedings; Final Modification, 77 FR 8101, 8102 (February...

  5. 75 FR 77838 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results of the...

    Science.gov (United States)

    2010-12-14

    ...: Certain Circular Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992) (``CWP Order... Antidumping and Countervailing Duty Administrative Reviews and Request for Revocation in Part, 74 FR 68229... of 1930, as amended (``the Act''). See Initiation Notice, 74 FR at 68229. On January 6, 2010,...

  6. 76 FR 52636 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Partial Rescission of...

    Science.gov (United States)

    2011-08-23

    ... Administrative Review, 75 FR 67079 (November 1, 2010). In accordance with 19 CFR 351.213(b), on November 30, 2010... Revocation in Part, 75 FR 81565 (December 28, 2010). Wheatland withdrew its request for a review of Husteel... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea:...

  7. 76 FR 15941 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of the Final Results...

    Science.gov (United States)

    2011-03-22

    ... From the Republic of Korea: Preliminary Results of the Antidumping Duty Administrative Review, 75 FR... the Tariff Act of 1930, As Amended, 70 FR 24533 (May 10, 2005). Accordingly, the deadline for... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension...

  8. 77 FR 34344 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final Results of the Antidumping...

    Science.gov (United States)

    2012-06-11

    ...-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992). These deposit requirements shall remain in... the Antidumping Duty Administrative Review, 76 FR 76369, 76374 (December 7, 2011) (``Preliminary... Results of the Antidumping Duty Administrative Review, 77 FR 8808 (February 15, 2012). We received...

  9. 77 FR 73015 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results of...

    Science.gov (United States)

    2012-12-07

    ...: Certain Circular Welded Non-Alloy Steel Pipe from Korea, 57 FR 49453 (November 2, 1992). Notification to... Administrative Review, 63 FR 32833 (June 16, 1998), remains dispositive. Partial Rescission of Administrative...: Assessment of Antidumping Duties, 68 FR 23954 (May 6, 2003). For Husteel and HYSCO, we intend to...

  10. The Effect of Ultrasonic Peening on Service Life of the Butt-Welded High-Temperature Steel Pipes

    Science.gov (United States)

    Daavari, Morteza; Vanini, Seyed Ali Sadough

    2015-09-01

    Residual stresses introduced by manufacturing processes such as casting, forming, machining, and welding have harmful effects on the mechanical behavior of the structures. In addition to the residual stresses, weld toe stress concentration can play a determining effect. There are several methods to improve the mechanical properties such as fatigue behavior of the welded structures. In this paper, the effects of ultrasonic peening on the fatigue life of the high-temperature seamless steel pipes, used in the petrochemical environment, have been investigated. These welded pipes are fatigued due to thermal and mechanical loads caused by the cycle of cooling, heating, and internal pressure fluctuations. Residual stress measurements, weld geometry estimation, electrochemical evaluations, and metallography investigations were done as supplementary examinations. Results showed that application of ultrasonic impact treatment has led to increased fatigue life, fatigue strength, and corrosion resistance of A106-B welded steel pipes in petrochemical corrosive environment.

  11. Residual-stresses in austenitic stainless-steel primary coolant pipes and welds of pressurized-water reactors

    International Nuclear Information System (INIS)

    Surface and through thickness residual stress measurements were performed on an aged cast austenitic-ferritic stainless steel pipe and on an orbital TIG weld representative of those of primary coolant pipes in pressurized water reactors. An abrasive-jet hole drilling method and a block removal and layering method were used. Surface stresses and through thickness stress profiles are strongly dependent upon heat treatments, machining and welding operations. In the aged cast stainless steel pipe, stresses ranged between -250 and +175 MPa. On and near the orbital TIG weld, the outside surface of the weld was in tension both in the axial and hoop directions, with maximum values reaching 420 MPa in the weld. On the inside surface, the hoop stresses were compressive, reaching -300 MPa. However, the stresses in the axial direction at the root of the weld were tensile within 4 mm depth from the inside surface, locally reaching 280 MPa. (author)

  12. Carbon steel flanges and welds evaluation on HF-alkylation unit

    Energy Technology Data Exchange (ETDEWEB)

    Peiiuela, L.; Chirinos, J. [PDVSA Manufacture y Mercadeo, Judibana (Venezuela). Centro de Refinacion Paraguana

    1999-11-01

    In 1995, there were two failures in the 20,000 BPD HF Alky unit at the Amuay Refinery causing a shutdown of the unit. The failures occurred in one flange and one weld in the depropanizer charge carbon steel pipe, containing propane, isobutane and anhydrous hydrofluoric acid at 190 F (88 C) and 321psig (22.5 Kg/cm{sup 2}). Examination showed severe uniform corrosion at the inside surface of the flange while the adjacent elbow showed minimal corrosion loss. The other failure showed preferential attack in the weld without corrosion loss in the pipe components. A complete evaluation of the Alky plant was necessary to identify other lines in similar conditions that could cause future emergency shutdown of the unit. An extensive on stream inspection program was performed on critical lines of the unit. This paper summarizes the results and conclusions of this evaluation.

  13. Marine atmospheric corrosion of carbon steels

    Directory of Open Access Journals (Sweden)

    Morcillo, Manuel

    2015-06-01

    Full Text Available Basic research on marine atmospheric corrosion of carbon steels is a relatively young scientific field and there continue to be great gaps in this area of knowledge. The presence of akaganeite in the corrosion products that form on steel when it is exposed to marine atmospheres leads to a notable increase in the corrosion rate. This work addresses the following issues: (a environmental conditions necessary for akaganeite formation; (b characterisation of akaganeite in the corrosion products formed; (c corrosion mechanisms of carbon steel in marine atmospheres; (d exfoliation of rust layers formed in highly aggressive marine atmospheres; (e long-term corrosion rate prediction; and (f behaviour of weathering steels. Field research has been carried out at Cabo Vilano wind farm (Camariñas, Galicia in a wide range of atmospheric salinities and laboratory work involving the use of conventional atmospheric corrosion techniques and near-surface and bulk sensitive analytical techniques: scanning electron microscopy (SEM/energy dispersive spectrometry (EDS, X-ray diffraction (XRD, Mössbauer spectroscopy and SEM/μRaman spectroscopy.La investigación fundamental en corrosión atmosférica marina de aceros al carbono es un campo científico relativamente joven que presenta grandes lagunas de conocimiento. La formación de akaganeíta en los productos de corrosión que se forman sobre el acero cuando se expone a atmósferas marinas conduce a un incremento notable de la velocidad de corrosión. En el trabajo se abordan las siguientes cuestiones: (a condiciones ambientales necesarias para la formación de akaganeíta, (b caracterización de la akaganeíta en los productos de corrosión formados, (c mecanismos de corrosión del acero al carbono en atmósferas marinas, (d exfoliación de las capas de herrumbre formadas en atmósferas marinas muy agresivas, (e predicción de la velocidad de corrosión a largo plazo, y (f comportamiento de aceros patinables. La

  14. Residual stress measurement of large-bore stainless steel pipe with butt-welded joint by inherent strain method

    International Nuclear Information System (INIS)

    This study describes residual stress distribution of large-bore and heavy-walled stainless steel pipe with butt-welded joint as measured by inherent strain method with distribution function in which the inherent strain distribution is represented as function. The deviation of the most probable residual stress value obtained by the method was enough small to indicate accurate measurement. The detail feature and 3D-distribution of the residual stress generated within the heavy-walled pipe with welded joint were discussed on two variously-sized pipe joints. It was found that the residual stress distribution had more complicated shape as the bore and thickness of the pipe was larger. (author)

  15. Comparison of Impact Properties for Carbon and Low Alloy Steels

    Institute of Scientific and Technical Information of China (English)

    O.H. Ibrahim

    2011-01-01

    The impact properties of hot rolled carbon steel (used for the manufacture of reinforcement steel bars) and the quenched & tempered (Q&T) low alloy steel (used in the pressure vessel industry) were determined. The microstructure of the hot rolled carbon steel contained ferrite/pearlite phases, while that of the quenched and tempered low alloy steel contained bainite structure. Impact properties were determined for both steels by instrumented impact testing at temperatures between -150 and 200℃. The impact properties comprised total impact energy, ductile to brittle transition temperature, crack initiation and propagation energy, brittleness transition temperature and cleavage fracture stress. The Q&T low alloy steel displayed much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was a little higher than that of the hot rolled carbon steel. The results were discussed in relation to the difference in the chemical composition and microstructure for the two steels.

  16. Cr-Mo Seamless Steel Pipe Welding Failure Analysis%Cr-Mo无缝钢管焊接失效分析

    Institute of Scientific and Technical Information of China (English)

    赵俊伟

    2012-01-01

    Cr-Mo无缝钢管具有抗氢腐蚀性和具有较好高温力学性能和耐温蠕变性能的珠光体耐热钢。文章介绍了Cr-Mo无缝钢管的焊接的主要问题,并针对某装置Cr-Mo无缝钢管焊接失效泄漏,分析此类无缝钢管焊接失效的原因。%Cr-Mo seamless steel pipe having resistance to hydrogen corrosion resistance and good mechanical properties at high temperature and high temperature creep properties of pearlitic heat resistant steel.The paper introduced the Cr-Mo seamless steel pipe welding problems,and in response to a Cr-Mo device of seamless steel pipe welding failure leakage,such analysis of seamless steel pipe welding failure reason

  17. Applications of the essay at slow deformation velocity in pipes of stainless steel AISI-304

    International Nuclear Information System (INIS)

    Nowadays is carried out research related with the degradation mechanisms of structures, systems and/or components in the nuclear power plants, since many of the involved processes are those responsible for the dependability of these, of the integrity of the components and of the aspects of safety. The purpose of this work, was to determine the grade of susceptibility to the corrosion of a pipe of Austenitic stainless steel AISI 304, in a solution of Na CI (3.5%) to the temperatures of 60 and 90 C, in two different thermal treatments - 1. - Sensitive 650 C by 4 hours and cooled in water. 2. Solubilized to 1050 C by 1 hour and cooled in water

  18. A Comparative Study on Numerical Buckling Analysis for a Cantilever Steel Pipe Column under Combined Loads

    Directory of Open Access Journals (Sweden)

    Yungang Zhan, Minxin Li

    2013-07-01

    Full Text Available Buckling of a cantilever steel pipe column under combined loads was studied through linear and nonlinear numerical analysis method. Firstly, linear buckling analysis of the cantilever column with linear-elastic material was used to select appropriate element type and element size for this problem. Then linear buckling and nonlinear buckling analyses for an imperfect cantilever column under different horizontal loads or displacements in the context of elasticity were performed to verify the ability of the linear buckling analysis to include large geometric changes. Thirdly, nonlinear analyses were carried out to examine the effect of plastification of material on the buckling limit loads for the imperfect cantilever column. Through these comparative studies, some aspects concerned with the numerical buckling analysis of structures such as columns were clarified.

  19. Report on Japanese performance demonstration examinations for depth sizing of SCC in austenitic stainless steel pipes

    International Nuclear Information System (INIS)

    The PD Center of Central Research Institute of Electric Power Industry (CRIEPI) commenced Performance Demonstration examinations for flaw depth sizing of austenitic stainless steel pipes in March 2006. As of January 2013, 37 examination sessions have been completed and 44 candidates have passed the examination. The total number of tests administered including re-tests and re-certification was 89. It was noted that depth sizing using a phased array plus the manual UT technique was the procedure most used by successful PD applicants. A major reason for failure is 'the overestimation caused by the lack of skill in distinguishing the base metal-to-weld metal interface echo and the SCC tip echo'. Moreover, the possibility of psychological bias is also incontrovertible because candidates are under pressure not to make a -4.4 mm critical mistake. (author)

  20. Random cyclic constitutive models of 0Cr18Ni10Ti pipe steel

    International Nuclear Information System (INIS)

    Experimental study is performed on the random cyclic constitutive relations of a new pipe stainless steel, 0Cr18Ni10Ti, by an incremental strain-controlled fatigue test. In the test, it is verified that the random cyclic constitutive relations, like the wide recognized random cyclic strain-life relations, is an intrinsic fatigue phenomenon of engineering materials. Extrapolating the previous work by Zhao et al, probability-based constitutive models are constructed, respectively, on the bases of Ramberg-Osgood equation and its modified form. Scattering regularity and amount of the test data are taken into account. The models consist of the survival probability-strain-life curves, the confidence strain-life curves, and the survival probability-confidence-strain-life curves. Availability and feasibility of the models have been indicated by analysis of the present test data

  1. Random cyclic strain-life relations of 0Cr18Ni10Ti pipe steel

    International Nuclear Information System (INIS)

    Experimental study is performed on the random cyclic strain-life relations of the new pipe steel, 0Cr18Ni10Ti, by strain-controlled fatigue tests. Probabilistic models for characterizing the relations are presented on a basis of the Coffin-Manson strain-life equation. Three kinds of effects on probabilistic assessments are taken into account, which are the scattering regularity, the amount, and the combined effect of scattering regularity and the amount of the test data. With respect to these effects, the models are consisted of three kinds of probabilistic curves, i.e. the survival probability-strain-life curves, the confidence-based strain-life curves, and the probability and confidence-based strain-life curves. Availability and feasibility of the models are indicated by an analysis to the test results

  2. Crack growth of intergranular stress corrosion cracks in austenitic stainless steel pipes of boiling water reactors

    International Nuclear Information System (INIS)

    Intergranular stress corrosion cracking (IGSCC) of boiling water reactor (BWR) piping is considered from the crack growth rate point of view. Crack growth rate of sensitized austenitic stainless steel welds is dependent on the degree of sensitization of the material and the severity of the environment as well as the stress state. In evaluation of actual crack growth rate there are three major sources of uncertainty: knowledge of actual crack size and shape, actual stress distribution in he area of the crack and the degree of sensitization. In the report the crack growth calculations used in the USA and in Sweden are presented. Finally, the crack growth rate predictions based on mechanistic modelling of IGSCC and some needs of further research in Finland are considered

  3. Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels

    International Nuclear Information System (INIS)

    This study aims at correlating microstructure and Charpy impact properties in high-toughness API X70 and X80 line-pipe steels. Three kinds of steels were fabricated by varying alloying elements and hot rolling conditions, and their microstructures and Charpy impact properties were investigated. In addition, their effective grain sizes were characterized by the electron back-scatter diffraction (EBSD) analysis. The Charpy impact test results indicated that the steels rolled in the single phase region had the higher upper shelf energy (USE) than the steel rolled in the two phase region because their microstructures were composed of acicular ferrites. In the X80 steel rolled in the single phase region, the decreased energy transition temperature (ETT) could be explained by the decrease in the overall effective grain size due to the presence of acicular ferrite having smaller effective grain size. Thus, it had excellent mechanical properties in yield and tensile strengths, absorbed energy, and transition temperature, except in ductility

  4. Tests Of Materials For Repair Coating Of Carbon Steel

    Science.gov (United States)

    Macdowell, Louis G., III

    1995-01-01

    Report describes tests of paints (primers and topcoats) for use in recoating rusted carbon steel for protection against further corrosion. Paints selected for evaluation all designated by manufacturers as suitable for application over tightly adhering rust.

  5. Warm Deformation Microstructure of a Plain Carbon Steel

    Institute of Scientific and Technical Information of China (English)

    B Eghbali; M Shaban

    2011-01-01

    Grain refinement in a plain carbon steel under intercritical warm deformation was studied by torsion tes ring. Based on the experimental results, the warm flow behaviour and microstructural evolution of ferrite were researched with particular emphasis on

  6. Assessment of Crack Detection in Heavy-Walled Cast Stainless Steel Piping Welds Using Advanced Low-Frequency Ultrasonic Methods

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Michael T.; Crawford, Susan L.; Cumblidge, Stephen E.; Denslow, Kayte M.; Diaz, Aaron A.; Doctor, Steven R.

    2007-03-01

    Studies conducted at the Pacific Northwest National Laboratory in Richland, Washington, have focused on assessing the effectiveness and reliability of novel approaches to nondestructive examination (NDE) for inspecting coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the U.S. Nuclear Regulatory Commission on the effectiveness and reliability of advanced NDE methods as related to the inservice inspection of safety-related components in pressurized water reactors (PWRs). This report provides progress, recent developments, and results from an assessment of low frequency ultrasonic testing (UT) for detection of inside surface-breaking cracks in cast stainless steel reactor piping weldments as applied from the outside surface of the components. Vintage centrifugally cast stainless steel piping segments were examined to assess the capability of low-frequency UT to adequately penetrate challenging microstructures and determine acoustic propagation limitations or conditions that may interfere with reliable flaw detection. In addition, welded specimens containing mechanical and thermal fatigue cracks were examined. The specimens were fabricated using vintage centrifugally cast and statically cast stainless steel materials, which are typical of configurations installed in PWR primary coolant circuits. Ultrasonic studies on the vintage centrifugally cast stainless steel piping segments were conducted with a 400-kHz synthetic aperture focusing technique and phased array technology applied at 500 kHz, 750 kHz, and 1.0 MHz. Flaw detection and characterization on the welded specimens was performed with the phased array method operating at the frequencies stated above. This report documents the methodologies used and provides results from laboratory studies to assess baseline material noise, crack detection, and length-sizing capability for low-frequency UT in cast stainless steel piping.

  7. Assessment of Crack Detection in Heavy-Walled Cast Stainless Steel Piping Welds Using Advanced Low-Frequency Ultrasonic Methods

    International Nuclear Information System (INIS)

    Studies conducted at the Pacific Northwest National Laboratory in Richland, Washington, have focused on assessing the effectiveness and reliability of novel approaches to nondestructive examination (NDE) for inspecting coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the U.S. Nuclear Regulatory Commission on the effectiveness and reliability of advanced NDE methods as related to the inservice inspection of safety-related components in pressurized water reactors (PWRs). This report provides progress, recent developments, and results from an assessment of low frequency ultrasonic testing (UT) for detection of inside surface-breaking cracks in cast stainless steel reactor piping weldments as applied from the outside surface of the components. Vintage centrifugally cast stainless steel piping segments were examined to assess the capability of low-frequency UT to adequately penetrate challenging microstructures and determine acoustic propagation limitations or conditions that may interfere with reliable flaw detection. In addition, welded specimens containing mechanical and thermal fatigue cracks were examined. The specimens were fabricated using vintage centrifugally cast and statically cast stainless steel materials, which are typical of configurations installed in PWR primary coolant circuits. Ultrasonic studies on the vintage centrifugally cast stainless steel piping segments were conducted with a 400-kHz synthetic aperture focusing technique and phased array technology applied at 500 kHz, 750 kHz, and 1.0 MHz. Flaw detection and characterization on the welded specimens was performed with the phased array method operating at the frequencies stated above. This report documents the methodologies used and provides results from laboratory studies to assess baseline material noise, crack detection, and length-sizing capability for low-frequency UT in cast stainless steel piping

  8. Generation of the Ultrasonic Guided Waves in a Seamless Stainless Steel Pipe Using an Array Transducer

    Science.gov (United States)

    Kim, Young H.; Song, Sung-Jin; Park, Joon-Soo; Jeon, Jin Hong; Kim, Jae-Hee; Eom, Heung-Sup; Im, Kwang Hee

    2005-04-01

    Ultrasonic guided waves have been widely employed for the long range inspection of structures such as plates, rods and pipes. In ultrasonic guided waves, however, there are numerous modes with different wave velocities, so that the generation and detection of the appropriate wave mode of the guided wave is one of key techniques in the application of guided waves. In the present work, mode tuning using an array transducer was investigated with the hardware implements to generate ultrasonic guided waves in a seamless stainless steel pipe. For this purpose, 8-channel ultrasonic pulser/receiver and their controller which enables sequential activation of each channels with given time delay were developed. A series of experiments was carried out in order to demonstrate the feasibility of dynamic tuning of modes by hardware: tuning the mode of the generated guided wave, group velocity measurement, tuned receiving and mode identification. As a result, the selective tuning of wave mode can be achieved by changing the time interval between adjacent elements of an array transducer.

  9. Dynamic versus quasi-static loading of X65 offshore steel pipes

    Science.gov (United States)

    Kristoffersen, M.; Børvik, T.; Langseth, M.; Hopperstad, O. S.

    2016-05-01

    Anchors or trawl gear occasionally impact offshore pipelines, resulting in large local and global deformations. Impact velocities are typically less than 5 m/s, but local strain rates may be very high. In this study strain rate effects in an X65 offshore material was characterised by split Hopkinson bar tests, while the cross-section homogeneity and possible anisotropic behaviour were determined by quasi-static material tests. Further, dynamic impact tests at prescribed velocities were carried out on simply supported full scale X65 steel pipes. Next, deformation-controlled quasi-static tests with the same boundary conditions were conducted. The level of deformation in the quasi-static tests was set to be equal to that attained in the dynamic tests. Finally, an assessment of the differences between the dynamically and quasi-statically loaded pipes was made in terms of force-displacement response, energy absorbed, and fracture. An optical light microscope and a scanning electron microscope were used to investigate fracture surfaces arising from the various tests.

  10. Laser de-sensitization heat treatment for inside surface of SUS304 stainless steel pipe welds

    International Nuclear Information System (INIS)

    The purpose of this study was to develop a technology for preventing the occurrence of Intergranular Stress Corrosion Cracking (IGSCC) by irradiating a high power YAG laser beam onto the sensitized Heat Affected Zone (HAZ) surface of SUS304 stainless steel. By irradiating a laser beam of the appropriate power density, a laser de-sensitization heat treatment (LDT) process was realized that formed both a molten layer of approximately 0.2 mm depth and a solution heat treated layer. The results of a Creviced Bent Beam (CBB) test to evaluate IGSCC showed that no cracks had appeared on the surface of the LDT parts. Also, after LDT was applied at a width of 40 mm in the vicinity of welding joints on the inside surface of pipes (thickness: 8 mm), approximately 250 MPa of tensile stress was measured as a residual stress on this LDT-processed surface. On the other hand, the tensile stress on the outside surface of these pipes decreased to the compression stress. (author)

  11. Analysis of noncoplanar pressurized laminations in X2 steel pipes by non-linear finite element

    Energy Technology Data Exchange (ETDEWEB)

    Morales, Alfredo [Instituto Tecnologico de Puebla (Mexico). Dept. de Posgrado; Gonzalez, Jorge L.; Hallen, Jose M. [Instituto Politecnico Nacional (Mexico). Escuela Superior de Ingenieria Quimica e Industrias Extractivas (ESIQIE). Dept. de Ingenieria Metalurgica

    2005-07-01

    Hydrogen induced cracking is of great interest in the mechanical integrity assessment of sour gas pipelines. Multiple stepwise cracks with internal pressure called laminations are often observed in pipelines and their interaction and coalescence may significantly affect the residual strength of the pipes. In this work, the interacting fields of non coplanar pressurized laminations in the wall of a pipe under pressure are analyzed by non-lineal finite element, considering an isotropic hardening law and the real tensile properties of the X52 steel. The results are presented as the evolution of the stress fields in the interlaminar region as a function of the pressure inside the laminations. It is found that for two approaching stepwise laminations the critical pressure follows a hyperbolic type law, thus the effect of the lamination length is principal for greater lengths and for shorter lengths the effect is minimum. The critical pressure is defined as pressure inside the lamination that causes plastification of the interlaminar region. (author)

  12. Investigation of boron segregation in low carbon steel

    OpenAIRE

    J. Lis; Lis, A; Kolan, C.

    2011-01-01

    Traces of born in the range 0,002-0,009 % are usually added to many grades of steel. The effect of boron on phase transformations and hardenability of low carbon low alloy steels depends on the form of its behavior in solid solution either in segregations or in precipitations. Temperature and cooling rate determine the existence of boron segregations on grain boundaries. In present paper simulations of boron concentrations were calculated with computer programme DICTRA for low carbon 0,08 %C ...

  13. 76 FR 2344 - Certain Hot-Rolled Carbon Steel Flat Products From India: Notice of Preliminary Results of...

    Science.gov (United States)

    2011-01-13

    ... columbium), or both, added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels...'') steels, and the substrate for motor lamination steels. IF steels are recognized as low- carbon steels... Antidumping Duty Order: Certain Hot-Rolled Carbon Steel Flat Products From India, 66 FR 60194 (December...

  14. 76 FR 48143 - Certain Hot-Rolled Carbon Steel Flat Products From the People's Republic of China: Preliminary...

    Science.gov (United States)

    2011-08-08

    ...), or both, added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels with...'') steels, and the substrate for motor lamination steels. IF steels are recognized as low carbon steels with...: Certain Hot-Rolled Carbon Steel Flat Products From the People's Republic of China, 66 FR 59561...

  15. Experimental fracture studies on carbon steel elbows with and without internal pressure

    International Nuclear Information System (INIS)

    Pipe bends or elbows are commonly used components for nuclear power plant piping system. In service, these piping components are subjected to internal pressure in addition to bending loads and the internal pressure is known to have a significant effect on the load carrying capacity of these components. Hence, a systematic study was carried out to investigate and quantify the effect of internal pressure on the fracture behaviour of elbows used in nuclear power plant piping system. Fracture studies were conducted on five 219 mm diameter carbon steel elbows with and without internal pressure under in-plane opening moment. The investigations have shown that the presence of a circumferential notch at the intrados has a more detrimental effect on the fracture behaviour of the elbow, when compared with the presence of an axial notch at the intrados. It is also found that internal pressure plays a significant role in reducing the ovalization. -- Highlights: • Fracture studies were conducted on elbows with and without internal pressure. • Effect of internal pressure on load carrying capacity of the elbows was studied. • Various data acquired during the study include load, LLD, CMOD, ovality of the elbow. • Circumferential notch at intrados significantly affects elbow load carrying capacity

  16. 76 FR 65748 - Certain Pipe and Tube From Brazil, India, Korea, Mexico, Taiwan, Thailand, and Turkey; Commission...

    Science.gov (United States)

    2011-10-24

    ... countervailing duty order on welded carbon steel pipe and tube from Turkey, the antidumping duty orders on welded... the domestic interested party group response to its notice of institution (76 FR 38691, July 1, 2011... order on welded carbon steel pipe and tube from Turkey and the antidumping duty orders on welded...

  17. 铸钢件与无缝钢管焊接技术%Cast Steel and Seamless Steel Pipe Welding Technology

    Institute of Scientific and Technical Information of China (English)

    臧盐龙

    2012-01-01

    结合京沪高速铁路镇江南站站房工程铸钢件同无缝钢管焊接施工中一些技术工作及相关经验,通过设计院的相关设计文件及现场焊接工艺的指导,经过权威专家的评审,最终根据焊接的成果总结出了在管桁架结构的现场安装中铸钢件同无缝钢管的焊接工艺及注意要点。%In combination with the steel castings with seamless steel pipe welding construction technology and related work experience of Beijing-Shanghai High Speed Railway Zhenjiang south railway station building engineering, through the design of the related design documents and field welding process guidance, through the assessment of experts, based on the final welding results, the paper summarized steel castings with seamless steel pipe welding process and points for attention in pipe truss structure installation.

  18. Trial manufacturing of copper-carbon steel composite overpack

    International Nuclear Information System (INIS)

    This paper reports the results of design analysis and trial manufacturing of copper-carbon steel composite overpacks. The overpack is one of the key components of the engineered barrier system, hence, it is necessary to confirm the applicability of current technique in their manufacture. The copper-carbon steel composite overpack consists of a double container, an outer vessel made of oxygen-free, high-purity copper as the corrosion allowance material, and an inner vessel made of carbon steel as the pressure-resistant material. The trial manufacturing in this time, only the copper outer vessel has been fabricated. Both oxygen-free copper and oxygen-free phosphorus copper were used as materials for the outer vessel. For the shell and bottom portion, these materials were formed integrally by a backward extrusion method. For sealing the top cover plate to the main body, an electron-beam welding method was applied. After manufacturing, mechanical testing of specimens from the copper vessels were carried out. It was confirmed that current technique has sufficient feasibility to manufacture outer vessel. In addition, potential for irradiation embrittlement of the inner carbon-steel vessel by irradiation from vitrified waste over the life time of the overpack has been analyzed. It was shown that the small degree of irradiation embrittlement gives no significant impact on the pressure resistance of the carbon-steel vessel. Future research and development items regarding copper-carbon steel composite overpacks are also discussed. (author)

  19. Effect of intercritical annealing treatment on the fracture toughness of SA106 Gr.C piping steel

    International Nuclear Information System (INIS)

    From the point of view on material properties in Leak-Before-Break (LBB) analysis, the premise of Leak-Before-Break (LBB) is that the materials used are sufficiently tough that small through-wall cracks would remain stable. The SA106 Gr.C piping steel, however, showed a substantial reduction in toughness due to dynamic strain aging (DSA) at the reactor operating temperature, which resulted in insufficient LBB safety margins. In this study, intercritical annealing in two-phase (α + γ) region was performed to investigate the possibility of improving the toughness and reducing DSA susceptibility for giving allowable LBB safety margins. Tensile tests were cried out under various temperatures and strain rates for assessing the material properties after the heat treatments. Also, Charpy impact tests were conducted to measure impact toughness at room temperature. After intercritical annealing the manifestations of dynamic strain aging (DSA) were observed in the tensile properties. However, the ductility loss caused by DSA was smaller than the as-received material. Furthermore, The intercritical annealing was able to increase the impact toughness by l.5 times compared to as-received material. It is considered that the cleaner (low carbon) retained ferrite, which was formed at the (α + γ) region, may have caused the higher impact toughness and ductility in addition to the general toughening due to finer grain sizes and increased ferrite content, which were resulted from the heat treatment. (author)

  20. Progress in the reliable inspection of cast stainless steel reactor piping components

    International Nuclear Information System (INIS)

    Studies conducted at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, have focused on assessing the effectiveness and reliability of novel NDE approaches for the inspection of coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the United States Nuclear Regulatory Commission (US NRC) on the utility, effectiveness and reliability of ultrasonic testing (UT) and eddy current testing (ET) inspection techniques as related to the inservice ultrasonic inspection of primary piping components in pressurized water reactors (PWRs). This paper describes progress, recent developments and results from assessments of three different NDE approaches including ultrasonic phased array inspection techniques, eddy current testing for surface-breaking flaws, and a low-frequency ultrasonic inspection methodology coupled with a synthetic aperture focusing technique (SAFT). Westinghouse Owner's Group (WOG) cast stainless steel pipe segments with thermal and mechanical fatigue cracks, PNNL samples containing thermal fatigue cracks and several blank spool pieces were used for assessing the inspection methods. Eddy current studies were conducted on the inner diameter (ID) surface of piping specimens while the ultrasonic inspection methods were applied from the outer diameter (OD) surface of the specimens. The eddy current technique employed a Zetec MIZ-27SI Eddy Current instrument and a Zetec Z0000857-1 cross point spot probe with an operating frequency of 250 kHz. In order to reduce noise effects, degaussing of a subset of the samples resulted in noticeable improvements. The phased array approach was implemented using an R/D Tech Tomoscan III system operating at 1 MHz, providing composite volumetric images of the samples. The low-frequency ultrasonic method employs a zone-focused, multi-incident angle inspection protocol (operating at 250-500 kHz) coupled with SAFT for improved signal-to-noise and

  1. Progress in the Reliable Inspection of Cast Stainless Steel Reactor Piping Components

    International Nuclear Information System (INIS)

    Studies conducted at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, have focused on assessing the effectiveness and reliability of novel NDE approaches for the inspection of coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the United States Nuclear Regulatory Commission (US NRC) on the utility, effectiveness and reliability of ultrasonic testing (UT) and eddy current testing (ET) inspection techniques as related to the inservice ultrasonic inspection of primary piping components in pressurized water reactors (PWRs). This paper describes progress, recent developments and results from assessments of three different NDE approaches including ultrasonic phased array inspection techniques, eddy current testing for surface-breaking flaws, and a low-frequency ultrasonic inspection methodology coupled with a synthetic aperture focusing technique (SAFT). Westinghouse Owner's Group (WOG) cast stainless steel pipe segments with thermal and mechanical fatigue cracks, PNNL samples containing thermal fatigue cracks and several blank spool pieces were used for assessing the inspection methods. Eddy current studies were conducted on the inner diameter (ID) surface of piping specimens while the ultrasonic inspection methods were applied from the outer diameter (OD) surface of the specimens. The eddy current technique employed a Zetec MIZ-27SI Eddy Current instrument and a Zetec Z0000857-1 cross point spot probe with an operating frequency of 250 kHz. In order to reduce noise effects, degaussing of a subset of the samples resulted in noticeable improvements. The phased array approach was implemented using an R/D Tech Tomoscan III system operating at 1 MHz, providing composite volumetric images of the samples. The low-frequency ultrasonic method employs a zone-focused, multi-incident angle inspection protocol (operating at 250-500 kHz) coupled with SAFT for improved signal-to-noise and

  2. The effect of oil on carbon dioxide corrosion inhibition on carbon steel - potential for improved corrosion protection

    Energy Technology Data Exchange (ETDEWEB)

    Foss, Martin Smedstad

    2009-07-01

    The search for robust and cost efficient ways to prevent internal corrosion of carbon steel piping and equipment in oil and gas production and transportation has lead to the development of highly sophisticated CO{sub 2} corrosion inhibitor products. This thesis studies oil wetting and corrosion inhibitor performance on bare steel and steel with corrosion product deposits on the surface, in the presence of a refined, low aromatic hydrocarbon oil. Three surfactants were used in the experiments; two commercial inhibitor base chemicals; an oleic imidazoline salt (OI) and a phosphate ester (PE), and cetyl trimethyl ammonium bromide (CTAB), a well characterized quaternary ammonium compound. Adsorption characteristics of the inhibitors on corroding iron and FeCO{sub 3} particles were also studied. Polarization resistance (PR) and electrochemical impedance spectroscopy (EIS) techniques were used to study the effect of the oil on the performance of the inhibitors. The performance testing was done on corroding carbon steel without any surface deposits and on carbon steel with either ferrous carbonate (FeCO{sub 3}) or ferric corrosion products on the surface. The results showed that the addition of oil in the inhibitor tests had a significant, positive effect on the performance of the two commercial corrosion inhibitors; decrease in corrosion rate of about one order of magnitude compared to the rate without oil was found. Based on the EIS data it was concluded that the improved performance was caused by a modification of the inhibitor film and not the formation of a macroscopic oil film on the steel surface. Indications of oil wetting of the steel surface were only found when ferric corrosion products were present and OI was used as the inhibitor. No such effects were seen on bare steel or on FeCO{sub 3} covered surfaces. Contact angle measurements and dispersion tests were used to investigate the effect of the inhibitors on the wettability of the three types of surfaces when

  3. The effect of oil on carbon dioxide corrosion inhibition on carbon steel - potential for improved corrosion protection

    International Nuclear Information System (INIS)

    The search for robust and cost efficient ways to prevent internal corrosion of carbon steel piping and equipment in oil and gas production and transportation has lead to the development of highly sophisticated CO2 corrosion inhibitor products. This thesis studies oil wetting and corrosion inhibitor performance on bare steel and steel with corrosion product deposits on the surface, in the presence of a refined, low aromatic hydrocarbon oil. Three surfactants were used in the experiments; two commercial inhibitor base chemicals; an oleic imidazoline salt (OI) and a phosphate ester (PE), and cetyl trimethyl ammonium bromide (CTAB), a well characterized quaternary ammonium compound. Adsorption characteristics of the inhibitors on corroding iron and FeCO3 particles were also studied. Polarization resistance (PR) and electrochemical impedance spectroscopy (EIS) techniques were used to study the effect of the oil on the performance of the inhibitors. The performance testing was done on corroding carbon steel without any surface deposits and on carbon steel with either ferrous carbonate (FeCO3) or ferric corrosion products on the surface. The results showed that the addition of oil in the inhibitor tests had a significant, positive effect on the performance of the two commercial corrosion inhibitors; decrease in corrosion rate of about one order of magnitude compared to the rate without oil was found. Based on the EIS data it was concluded that the improved performance was caused by a modification of the inhibitor film and not the formation of a macroscopic oil film on the steel surface. Indications of oil wetting of the steel surface were only found when ferric corrosion products were present and OI was used as the inhibitor. No such effects were seen on bare steel or on FeCO3 covered surfaces. Contact angle measurements and dispersion tests were used to investigate the effect of the inhibitors on the wettability of the three types of surfaces when they were exposed to

  4. Predicting the long term corrosion behaviour of pipe steels used at the CCS-site Ketzin, Germany in laboratory CO{sub 2}-saturated saline aquifer CCS-environment

    Energy Technology Data Exchange (ETDEWEB)

    Pfennig, A.; Linke, B. [HTW Univ. of Applied Sciences Berlin, Berlin (Germany); Kranzmann, A. [Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin (Germany)

    2010-07-01

    During Carbon Capture and Storage (CCS) CO{sub 2}-corrosion of pipe steels is a relevant safety issue when emission gases are compressed in deep geological layers. The reliability of the steels 42CrMo4 (1.7225), X46Cr13 (1.4034), X20Cr13 (1.4021) and X35CrMo17 (1.4122) is demonstrated in laboratory experiments under an equivalent corrosive aquifer environment as found at the geological onshore CCS-site at Ketzin, Germany at the in-situ temperature 60 C. (orig.)

  5. Characterization of D2 tool steel friction surfaced coatings over low carbon steel

    International Nuclear Information System (INIS)

    Highlights: • Solid state coating by friction surfacing method. • D2 tool steel is coated over relatively softer low carbon steel. • Defect free interface between tool steel coating and low carbon steel substrate. • D2 coatings exhibited higher hardness and good wear resistance. • Highly refined martensitic microstructure in the coating. - Abstract: In this work D2 tool steel coating is produced over a low carbon steel substrate using friction surfacing process. The process parameters are optimized to get a defect free coating. Microstructural characterization is carried out using optical microscopy, scanning electron microscopy and X-ray diffraction. Infrared thermography is used to measure the thermal profile during friction surfacing of D2 steel. Wear performance of the coating is studied using Pin-on-Disk wear tests. A lower rotational speed of the consumable rod and higher translational speed of the substrate is found to result in thinner coatings. Friction surfaced D2 steel coating showed fine-grained martensitic microstructure compared to the as-received consumable rod which showed predominantly ferrite microstructure. Refinement of carbides in the coating is observed due to the stirring action of the process. The infrared thermography studies showed the peak temperature attained by the D2 coating to be about 1200 °C. The combined effect of martensitic microstructure and refined carbides resulted in higher hardness and wear resistance of the coating

  6. In situ 3D monitoring of corrosion on carbon steel and ferritic stainless steel embedded in cement paste

    International Nuclear Information System (INIS)

    Highlights: • The morphology of the corrosion of steel in cement paste was studied in situ. • During galvanostatic corrosion, carbon steel reinforcement corroded homogeneously. • On ferritic stainless steel, deep corrosion pits formed and caused wider cracks. • The measured rate of steel loss correlated well with Faraday’s law of electrolysis. - Abstract: In a X-ray microcomputed tomography study, active corrosion was induced by galvanostatically corroding steel embedded in cement paste. The results give insight into corrosion product build up, crack formation, leaching of products into the cracks and voids, and differences in morphology of corrosion attack in the case of carbon steel or stainless steel reinforcement. Carbon steel was homogeneously etched away with a homogeneous layer of corrosion products forming at the steel/cement paste interface. For ferritic stainless steel, pits were forming, concentrating the corrosion products locally, which led to more extensive damage on the cement paste cover

  7. An experience with in-service fabrication and inspection of austenitic stainless steel piping in high temperature sodium system

    International Nuclear Information System (INIS)

    Highlights: • Procedure for changing 304L SS pipe to 316L SS in sodium loop has been established. • Hot leg made of 304L SS was isolated from existing cold leg made of 316LN SS. • Innovative welding was used in joining the new 316L SS pipe with existing 316LN SS. • The old components of 304L SS piping have been integrated with the new piping. - Abstract: A creep testing facility along with dynamic sodium loop was installed at Indira Gandhi Centre for Atomic Research, Kalpakkam, India to assess the creep behavior of fast reactor structural materials in flowing sodium. Type 304L austenitic stainless steel was used in the low cross section piping of hot-leg whereas 316LN austenitic stainless steel in the high cross section cold-leg of the sodium loop. The intended service life of the sodium loop was 10 years. The loop has performed successfully in the stipulated time period. To enhance its life time, it has been decided to replace the 304L piping with 316L piping in the hot-leg. There were more than 300 welding joints involved in the integration of cold-leg with the new 316L hot-leg. Continuous argon gas flow was maintained in the loop during welding to avoid contamination of sodium residue with air. Several innovative welding procedures have been adopted for joining the new hot-leg with the existing cold-leg in the presence of sodium residue adopting TIG welding technique. The joints were inspected for 100% X-ray radiography and qualified by performing tensile tests. The components used in the discarded hot-leg were retrieved, cleaned and integrated in the renovated loop. A method of cleaning component of sodium residue has been established. This paper highlights the in-service fabrication and inspection of the renovation

  8. Failure Analysis Of Industrial Boiler Pipe

    International Nuclear Information System (INIS)

    Failure analysis of industrial boiler pipe has been done. The tested pipe material is carbon steel SA 178 Grade A refer to specification data which taken from Fertilizer Company. Steps in analysis were ; collection of background operation and material specification, visual inspection, dye penetrant test, radiography test, chemical composition test, hardness test, metallography test. From the test and analysis result, it is shown that the pipe failure caused by erosion and welding was shown porosity and incomplete penetration. The main cause of failure pipe is erosion due to cavitation, which decreases the pipe thickness. Break in pipe thickness can be done due to decreasing in pipe thickness. To anticipate this problem, the ppe will be replaced with new pipe

  9. Carbon steel protection in G.S. (Girlder sulfide) plants. Iron sulfide scales formation on surfaces covered by fabrication produced films. Pt. 4

    International Nuclear Information System (INIS)

    This work describes the assays aimed to passivate the steel carbon of the process pipings. This steel is marked by the ASTM A 333 G6 and is chemically similar to those of isotopic exchange towers which corrode in contact with in-water hydrogen sulfide solutions forming iron sulfide protective layers. The differences between both materials lie in the surface characteristics to be passivated. The steel of towers has an internal side covered by paint which shall be removed prior to passivation. The steel's internal side shall be covered by a film formed during the fabrication process and constituted by calcinated wastes and iron oxides (magnetite, hematite and wustite). This film interferes in the formation process of passivating layers of pyrrhotite and pyrite. The possibility to passivate the pipes in their actual state was evaluated since it would result highly laborious and expensive to eliminate the film. (Author)

  10. Microstructural characterisation of carbon implanted austenitic stainless steel

    International Nuclear Information System (INIS)

    Low carbon (316L) austenitic stainless steel has been implanted with carbon ions with a fluence of 5 x 1017 C ions/cm2 using an ion energy of 75 keV. The effect of carbon ion implantation on the microstructure of the austenitic steel has been examined in cross-section using transmission electron microscopy (TEM) both before and after implantation, and the implantation data correlated with a computer based simulation, TRIM (Transport and Range of Ions in Matter). It has been found that the high-fluence carbon ion implantation modified the microstructure of the steel, as demonstrated by the presence of two amorphous layers separated by a layer of expanded austenite

  11. Microstructural characterisation of carbon implanted austenitic stainless steel

    Energy Technology Data Exchange (ETDEWEB)

    Murphy, M.E. [Scientific Affairs Research Group, Stryker Orthopaedics, Raheen Business Park, Limerick (Ireland)]. E-mail: matthew.murphy@stryker.com; Insley, G.M. [Scientific Affairs Research Group, Stryker Orthopaedics, Raheen Business Park, Limerick (Ireland); Laugier, M.T. [Department of Physics, University of Limerick, Limerick (Ireland); Newcomb, S.B. [Sonsam Ltd., Glebe Laboratories, Newport, Tipperary (Ireland)

    2005-06-01

    Low carbon (316L) austenitic stainless steel has been implanted with carbon ions with a fluence of 5 x 10{sup 17} C ions/cm{sup 2} using an ion energy of 75 keV. The effect of carbon ion implantation on the microstructure of the austenitic steel has been examined in cross-section using transmission electron microscopy (TEM) both before and after implantation, and the implantation data correlated with a computer based simulation, TRIM (Transport and Range of Ions in Matter). It has been found that the high-fluence carbon ion implantation modified the microstructure of the steel, as demonstrated by the presence of two amorphous layers separated by a layer of expanded austenite.

  12. Ultra low carbon bainitic (ULCB) steels after quenching and tempering

    International Nuclear Information System (INIS)

    The mechanical and Charpy V impact strength properties of new advanced ultra low carbon bainitic (ULBC) steels after water quenching and tempering (WQT) have been investigated. Their chemical compositions are given. The nine continuous cooling transformation diagrams (CCT) of the new ULCB steel grades have been established. The CCT diagrams for ULCBNi steels containing 9% Ni - grade 10N9 and 5% Ni - grade HN5MVNb are given. The comparison between CCT diagrams of 3.5%Ni + 1.5%Cu containing steels grade HSLA 100 and HN3MCu is shown. The effect of the increase in carbon and titanium contents in the chemical composition of ULCBMn steels 04G3Ti, 06G3Ti and 09G3Ti on the kinetics of phase transformations during continuous cooling is presented by the shifting CCT diagrams. The Charpy V impact strength and brittle fracture occurence curves are shown. The effect of tempering temperature on tensile properties of WQT HN3MCu steel is shown and Charpy V impact strength curves after different tempering conditions are shown. The optimum tempering temperatures region of HN3MCu steel for high Charpy V impact toughness at law temperatures - 80oC(193 K) and -120oC(153 K) is estimated. The effect of tempering temperature on mechanical properties of HN5MVNb steel is given. The low temperature impact Charpy V toughness of HN5MVNb steel is shown. The optimum range of tempering temperature during 1 hour for high toughness of WQT HN5MVNb steel is given. HN3MCu and HN5MVNb steels after WQT have high yield strength YS≥690 MPa and high Charpy V impact toughness KV≥80 J at -100oC (173K) and KCV≥50 J/cm2 at - 120oC (153K) so they may be used for cryogenic applications

  13. Local microstructures, Hardness and mechanical properties of a stainless steel pipe-welded joint

    International Nuclear Information System (INIS)

    An experimental investigation is carefully performed into the local microstructures, hardness values and monotonic mechanical properties of the three zones (the base metal, heat affecting zone and weld metal) of 1Cr18Ni9Ti stainless steel pipe-welded joint. The local microstructures are observed by a metallurgical test and a surface replica technology, the local hardness values are measures by a random Vickers hardness test, and the local mechanical properties are characterized by the Ramberg-Osgood and modified Ramberg-Osgood stress-stain relations. The investigation reveals that there are significant differences of the three zones in the local microstructures, hardness values and monotonic mechanical properties, especially of the three zones in the local microstructure, hardness values and monotonic mechanical properties, especially of the weld metal. The weld metal exhibits the largest heterogeneity of local microstructures and monotonic mechanical properties, and the largest scatter of local hardness values. It is necessary to consider these difference and introduce the reliability method to model the scatter in the pipe analysis. In addition, it is verified that a columnar grain structure, which is made up of matrix-rich δ ferrite bands, can characterize the weld metal and the distance between the neighboring rich δ ferrite bands is an appropriate measurement of the columnar grain structure. This measurement is in accordance with the transition point between the microstructural short crack and physical small crack stages, which are generally used for characterizing the short fatigue crack behavior of materials. This indicates that the microstructure controls the fatigue damage character of the present material

  14. Analysis on the deformation and fracture behavior of carbon steel by in situ tensile test

    Institute of Scientific and Technical Information of China (English)

    Fan Li; Haibo Huang

    2006-01-01

    The deformation and fracture behaviors of low-carbon steel, medium-carbon steel, and high-carbon steel were studied on internal microstructure using the scanning electron microscopy in situ tensile test. The microstructure mechanism of their deformation and fracture behavior was analyzed. The results show that the deformation and fracture behavior of low-carbon steel depends on the grain size of ferrite, the deformation and fracture behavior of medium-carbon steel depends on the size of ferrite grain and pearlite lump,and the deformation and fracture behavior of high-carbon steel depends on the size of pearlite lump and the pearlitic interlamellar spacing.

  15. 48 CFR 252.225-7030 - Restriction on Acquisition of Carbon, Alloy, and Armor Steel Plate.

    Science.gov (United States)

    2010-10-01

    ... of Carbon, Alloy, and Armor Steel Plate. 252.225-7030 Section 252.225-7030 Federal Acquisition... Acquisition of Carbon, Alloy, and Armor Steel Plate. As prescribed in 225.7011-3, use the following clause: Restriction on Acquisition of Carbon, Alloy, and Armor Steel Plate (DEC 2006) (a) Carbon, alloy, and...

  16. Identification of Relevant Work Parameters of Ladle Furnace While Melting the High Ductility Steel and High-Carbon Steel

    Directory of Open Access Journals (Sweden)

    Warzecha M.

    2016-03-01

    Full Text Available In the present paper, secondary metallurgical treatment in ladle furnace during smelting the high carbon steel and steel with improved ductility for cold-deforming, under industrial conditions were analyzed.

  17. 75 FR 65453 - Certain Hot-Rolled Flat-Rolled Carbon Quality Steel Flat Products From Brazil: Notice of...

    Science.gov (United States)

    2010-10-25

    ...)) steels, high strength low alloy (HSLA) steels, and the substrate for motor lamination steels. IF steels... niobium added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels with micro...-Rolled Flat-Rolled Carbon Quality Steel Products From Brazil, 64 FR 38756, 38759 (July 19, 1999). On...

  18. Laser ignition of bulk 1018 carbon steel in pure oxygen

    Science.gov (United States)

    Nguyen, K.; Branch, M. C.

    1986-01-01

    Experiments were undertaken to study the ignition characteristics of bulk 1018 carbon steel in a pure oxygen environment. Cylindrical 1018 carbon steel specimens 5 mm in diameter and 5 mm high were ignited by a focused CW CO2 laser beam in a cool, static, pure oxygen environment at oxygen pressures ranging from 0.103 to 6.895 MPa. A two-color pyrometer was designed and used to measure the ignition temperatures of the specimens. The temperature history of a spot approximately 0.5 mm in diameter located at the center of the specimen top surface was recorded with a maximum time resolution of 25 microsec, and with an accuracy of a few percent. Ignition temperature of bulk 1018 carbon steel was identified from the temperature history curve with the aid of the light intensity curve. Results show that 1018 carbon steel specimens ignite at temperatures between 1388 and 1450 K, which are below the melting range of the alloy (1662-1685 K). The ignition temperature of 1018 carbon steel is mildly dependent on oxygen pressure over the range of oxygen pressure investigated in this study.

  19. 78 FR 42039 - Certain Hot-Rolled Carbon Steel Flat Products From the People's Republic of China: Preliminary...

    Science.gov (United States)

    2013-07-15

    ... (``HSLA'') steels, and the substrate for motor lamination steels. IF steels are recognized as low carbon... columbium), or both, added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels... Carbon Steel Flat Products from the People's Republic of China, 66 FR 59561 (November 29, 2001)....

  20. Ultrafine-grained low carbon steels by severe plastic deformation

    Directory of Open Access Journals (Sweden)

    S. Dobatkin

    2008-07-01

    Full Text Available The structure and properties of 0,14% C and 0,1% C - B low-carbon steels taken in two initial states, martensitic and ferritic-pearlitic, were studied after cold equal-channel angular (ECA pressing. ECA pressing leads to the formation of only partially submicrocrystalline structure with a grain size of 150 – 300 nm, depending on the steel alloying and initial state. The finest structure with the elements of 190 nm in size is obtained in the 0,1% C - B steel microalloyed with boron. The strength of the 0,1% C - B steel after cold ECA pressing (Rm = 805-1235 MPa meets the specifications of fasteners of the R80 - R120 strength grade. The strength of the deformed 0,14% C steel is close to the R80 strength grade.

  1. Development and processing of low carbon bainitic steels

    OpenAIRE

    Suikkanen, P. (Pasi)

    2009-01-01

    Abstract The aim of this work was to study systematically the effects of composition and processing on austenite grain growth and static recrystallization (SRX) kinetics, austenite decomposition under controlled cooling as well as microstructures, mechanical properties and weldability of hot rolled low carbon bainitic (LCB) steels. The results showed that the coarsening of austenite grain structure is influenced by the chemical composition. Steels with Nb-Ti alloying exhibited fine and uni...

  2. MICROBIAL CORROSION OF MILD AND MEDIUM CARBON STEELS

    OpenAIRE

    J. E.O. OVRI; S. I. OKEAHIALAM; O. O. ONYEMAOBI

    2013-01-01

    The role of bacteria in the corrosion of mild and medium carbon steels is reported. The steels were exposed to anaerobic and aerobic, and fresh water (control) environments. The corrosion rates were evaluated at intervals of seven days for a period of 42 days using weight loss and electrochemical methods. The corroded specimens were visually examined and majorities were found to have undergone general corrosion in the three environments (aerobic, anaerobic, and fresh water)....

  3. The anaerobic corrosion of carbon steel in concrete

    International Nuclear Information System (INIS)

    This is the final report of a 2 year programme aimed at (1) determining the rate of anaerobic corrosion of steel in concrete, (2) investigating the nature of the corrosion products formed on carbon steel embedded in cementitious material under anaerobic conditions and (3) evaluating the effect of hydrogen over-pressures on the rate of anaerobic corrosion. All experiments have been carried out at temperatures in the range 20-300C, ie ambient conditions. 4 refs.; 19 figs.; 6 tabs

  4. ESTIMATION OF IRREVERSIBLE DAMAGEABILITY AT FATIGUE OF CARBON STEEL

    Directory of Open Access Journals (Sweden)

    I. O. Vakulenko

    2014-04-01

    Full Text Available Purpose. Damageability estimation of carbon steel in the conditions of cyclic loading. Methodology. The steel fragments of railway wheel rim and rail head served as material for research with chemical composition 0.65 % С, 0.67 % Mn, 0.3 % Si, 0.027 % P, 0.028 % S и 0.7 % C, 0.82 % Mn, 0.56 % Si, 0.025 % P, 0.029 % S accordingly. The microstructure of tested steels corresponded to the state of metal after a hot plastic deformation. The fatigue research was conducted in the conditions of symmetric bend using the proof-of-concept machine of type «Saturn-10». Full Wohler diagrams and the lines corresponding to forming of sub-and micro cracks were constructed. The distribution analysis of internal stresses in the metal under cyclic loading was carried out using the microhardness tester of PMT-3 type.Findings. On the basis of fatigue curves for high-carbon steels analysis the positions of borders dividing the areas of convertible and irreversible damages were determined. The article shows that with the growth of carbon concentration in the steel at invariability of the structural state an increase of fatigue limit is observed. At the same time the acceleration of processes, which determine transition terms from the stage of forming of submicrocracks to the microcracks occurs. The research of microhardness distribution in the metal after destruction confirmed the nature of carbon amount influence on the carbon steel characteristics. Originality. Regardless on the stages of breakdown site forming the carbon steels behavior at a fatigue is determined by the ration between the processes of strengthening and softening. At a cyclic loading the heterogeneity of internal stresses distribution decreases with the increase of distance from the destruction surface. Analysis of metal internal restructuring processes at fatigue loading made it possible to determine that at the stages prior to incubation period in the metal microvolumes the cells are already

  5. Increasing corrosion resistance of carbon steels by surface laser cladding

    Science.gov (United States)

    Polsky, V. I.; Yakushin, V. L.; Dzhumaev, P. S.; Petrovsky, V. N.; Safonov, D. V.

    2016-04-01

    This paper presents results of investigation of the microstructure, elemental composition and corrosion resistance of the samples of low-alloy steel widely used in the engineering, after the application of laser cladding. The level of corrosion damage and the corrosion mechanism of cladded steel samples were established. The corrosion rate and installed discharge observed at the total destruction of cladding were obtained. The regularities of structure formation in the application of different powder compositions were obtained. The optimal powder composition that prevents corrosion of samples of low-carbon low-alloy steel was established.

  6. In situ 3D monitoring of corrosion on carbon steel and ferritic stainless steel embedded in cement paste

    KAUST Repository

    Itty, Pierre-Adrien

    2014-06-01

    In a X-ray microcomputed tomography study, active corrosion was induced by galvanostatically corroding steel embedded in cement paste. The results give insight into corrosion product build up, crack formation, leaching of products into the cracks and voids, and differences in morphology of corrosion attack in the case of carbon steel or stainless steel reinforcement. Carbon steel was homogeneously etched away with a homogeneous layer of corrosion products forming at the steel/cement paste interface. For ferritic stainless steel, pits were forming, concentrating the corrosion products locally, which led to more extensive damage on the cement paste cover. © 2014 Elsevier Ltd.

  7. MICROBIAL CORROSION OF MILD AND MEDIUM CARBON STEELS

    Directory of Open Access Journals (Sweden)

    J. E. O. OVRI

    2013-10-01

    Full Text Available The role of bacteria in the corrosion of mild and medium carbon steels is reported. The steels were exposed to anaerobic and aerobic, and fresh water (control environments. The corrosion rates were evaluated at intervals of seven days for a period of 42 days using weight loss and electrochemical methods. The corroded specimens were visually examined and majorities were found to have undergone general corrosion in the three environments (aerobic, anaerobic, and fresh water. The mild steel was found to corrode more than the medium carbon steel in anaerobic environment-mild steel: 6.43×10-4 mpy and -0.93 mV, due to limited available oxygen whilst it had -0.89 mV in aerobic and -0.77 mV in the fresh water. The medium carbon steel had -5.30×10-4 mpy and -0.91 mV in anaerobic: -0.84mV in aerobic and -0.74mV in freshwater.

  8. Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

    Science.gov (United States)

    Kang, Jidong; Zheng, Wenyue; Bibby, Darren; Amirkhiz, Babak Shalchi; Li, Jian

    2016-01-01

    Tests were conducted on X80 and X100 pipe steels at 95% specified minimum yield stress in NS4 solution mixed with soil using specimens machined along the transverse direction of the pipes. Crack initiation in X100 is much easier than in X80. With test time increasing from 110 to 220 days, less numerous but deeper cracks were found in both pipe steels. Cracks showed higher growth rates in the transverse specimens than those in longitudinal ones. TEM results revealed concentration of Ni or Cr elements, formation of oxide layer at crack walls, and TiN-related dissolution at the crack tip.

  9. Content of nitrogen in waste petroleum carbon for steel industries

    International Nuclear Information System (INIS)

    Steel industries use refined carbon as an alloy for steel production. This alloy is produced from waste carbon from the distillation of the petroleum. The refined carbon, called recarburizer, is obtained by calcination at high temperature. Under these thermal conditions the organic molecules decompose and a fraction of the N2, S and H2, volatile material and moisture are released; while the carbon tends to develop a crystalline structure similar to graphite's. The right combination of calcinations temperature and time in the furnace can optimize the quality of the resulting product. The content of S and N2 has to be minimized for the use of calcined carbon in the steel industry. Nitrogen content should be reduced by two orders of magnitude, from 1% - 2% down to hundreds of ppm by weight. This work describes the activities undertaken to obtain calcined coke from petroleum from crude oil carbon that satisfies the requirements of the Mercosur standard 02:00-169 (Pending) for use as a carborizer in steels industries. To satisfy the requirements of the Mercosur standards NM 236:00 IRAM-IAS-NM so that graphite is used as a carburizer a content of 300 ppm maximum weight of nitrogen has to be obtained. So the first stage in this development is to define a production process for supplying calcined coke in the range of nitrogen concentrations required by the Mercosur standards (CW)

  10. Austenite Recrystallization and Controlled Rolling of Low Carbon Steels

    Institute of Scientific and Technical Information of China (English)

    DU Lin-xiu; ZHANG Zhong-ping; SHE Guang-fu; LIU Xiang-hua; WANG Guo-dong

    2006-01-01

    The dynamic recrystallization and static recrystallization in a low carbon steel were investigated through single-pass and double-pass experiments. The results indicate that as the deformation temperature increases and the strain rate decreases, the shape of the stress-strain curve is changed from dynamic recovery shape to dynamic recrystallization shape. The austenite could not recrystallize within a few seconds after deformation at temperature below 900 ℃. According to the change in microstructure during deformation, the controlled rolling of low carbon steel can be divided into four stages: dynamic recrystallization, dynamic recovery, strain-induced ferrite transformation, and rolling in two-phase region. According to the microstructure after deformation, the controlled rolling of low carbon steel can be divided into five regions: non-recrystallized austenite, partly-recrystallized austenite, fully-recrystallized austenite, austenite to ferrite transformation, and dual phase.

  11. Initial Atmospheric Corrosion of Carbon Steel in Industrial Environment

    Science.gov (United States)

    Han, Wei; Pan, Chen; Wang, Zhenyao; Yu, Guocai

    2015-02-01

    The initial corrosion behavior of carbon steel subjected to Shenyang industrial atmosphere has been investigated by weight-loss measurement, scanning electron microscopy observation, x-ray diffraction, auger electron spectroscopy, and electron probe microanalysis. The experimental results reveal that the corrosion kinetics of the initial corrosion of carbon steel in industrial atmosphere follows empirical equation D = At n , and there is a corrosion rate transition from corrosion acceleration to deceleration; the corrosion products are composed of γ-FeOOH, α-FeOOH, Fe3O4, as well as FeS which is related to the existence of sulfate-reducing bacteria in the rust layers. The effect of dust particles on the corrosion evolution of carbon steel has also been discussed.

  12. Monitoring Techniques for Microbially Influenced Corrosion of Carbon Steel

    DEFF Research Database (Denmark)

    Hilbert, Lisbeth Rischel

    2000-01-01

    Abstract Monitoring Techniques for Microbially Influenced Corrosion of Carbon Steel Microbially influenced corrosion (MIC) of carbon steel may occur in media with microbiological activity of especially sulphate-reducing bacteria, e.g. on pipelines buried in soil and on marine structures. MIC of...... carbon steel must be monitored on-line in order to provide an efficient protection and control the corrosion. A number of monitoring techniques is industrially used today, and the applicability and reliability of these for monitoring MIC is evaluated. Coupons and ER are recommended as necessary basic...... techniques even though localised corrosion rate cannot be measured. FSM measures general corrosion and detects localised corrosion, but the sensitivity is not high enough for monitoring initiation of pitting and small attacks. Electrochemical techniques as LPR and EIS give distorted data and unreliable...

  13. Non-linear finite element-based material constitutive law for zero slump steel fiber reinforced concrete pipe structures

    Science.gov (United States)

    Mikhaylova, Alena

    This study presents a comprehensive investigation of performance and behavior of steel-fiber reinforced concrete pipes (SFRCP). The main goal of this study is to develop the material constitutive model for steel fiber reinforced concrete used in dry-cast application. To accomplish this goal a range of pipe sizes varying from 15 in. (400 mm) to 48 in. (1200 mm) in diameter and fiber content of 0.17%, 0.25%, 0.33%, 0.5%, 0.67% and 83% by volume were produced. The pipes were tested in three-edge bearing condition to obtain the load-deformation response and overall performance of the pipe. The pipes were also subjected to hydrostatic joint and joint shear tests to evaluate the performance of the fiber-pipe joints for water tightness and under differential displacements, respectively. In addition, testing on hardened concrete was performed to obtain the basic mechanical material properties. High variation in the test results for material testing was identified as a part of experimental investigation. A three-dimensional non-linear finite element model of the pipe under the three edge bearing condition was developed to identify the constitutive material relations of fiber-concrete composite. A constitutive model of concrete implementing the concrete plasticity and continuum fracture mechanics was considered for defining the complex non-linear behavior of fiber-concrete. Three main concrete damage algorithms were examined: concrete brittle cracking, concrete damaged plasticity with adaptive meshing technique and concrete damaged plasticity with visco-plastic regularization. The latter was identified as the most robust and efficient to model the post-cracking behavior of fiber reinforced concrete and was used in the subsequent studies. The tension stiffening material constitutive law for composite concrete was determined by converging the FEM solution of load-deformation response with the results of experimental testing. This was achieved by iteratively modifying the non

  14. Residual Stresses Due to Circumferential Girth Welding of Austenitic Stainless Steel Pipes

    Science.gov (United States)

    Tarak, Farzan

    Welding, as a joining method in fabrication of engineering products and structural elements, has a direct influence on thermo-mechanical behavior of components in numerous structural applications. Since these thermo-mechanical behaviors have a major role in the life of welding components, predicting thermo-mechanical effects of welding is a major factor in designing of welding components. One of the major of these effects is generation of residual stresses due to welding. These residual stresses are not the causes of failure in the components solely, but they will add to external loads and stresses in operating time. Since, experimental methods are time consuming and expensive, computational simulation of welding process is an effective method to calculate these residual stresses. This investigation focuses on the evaluation of residual stresses and distortions due to circumferential girth welding of austenitic stainless steel pipes using the commercial finite element software ESI Visual-Environment and SYSWELDRTM to simulate welding process. Of particular importance is the comparison of results from three different types of mechanics models: 1) Axisymmetric, 2) Shell, and 3) Full 3-D.

  15. Metal magnetic memory signals from surface of low-carbon steel and low-carbon alloyed steel

    Institute of Scientific and Technical Information of China (English)

    DONG Li-hong; XU Bin-shi; DONG Shi-yun; YE Ming-hui; CHEN Qun-zhi; WANG Dan; YIN Da-wei

    2007-01-01

    In order to investigate the regularity of metal magnetic signals of ferromagnetic materials under the effect of applied load, the static tensile test of Q235 steel and 18CrNiWA steel plate specimens were conducted and metal magnetic memory signals of specimens were measured during the test process.The influencing factors of metal magnetic memory signals and the relationship between axial appliedload and signals were analyzed. The fracture and microstructure of the specimens were observed.The results show that the magnetic signals corresponding to the measured points change linearly approximately with increasing axial load.The microstructure of Q235 steel is ferrite and perlite, whereas that of l8CrNiWA steel is bainite and low-carbon martensite.The fracture of these two kinds of specimens is ductile rupture;carbon content of specimen materials and dislocation glide give much contribution to the characterisffcs of magnetic curves.

  16. Trial manufacturing of titanium-carbon steel composite overpack

    Energy Technology Data Exchange (ETDEWEB)

    Honma, Nobuyuki; Chiba, Takahiko; Tanai, Kenji [Japan Nuclear Cycle Development Inst., Waste Management and Fuel Cycle Research Center, Tokai, Ibaraki (Japan)

    1999-11-01

    This paper reports the results of design analysis and trial manufacturing of full-scale titanium-carbon steel composite overpacks. The overpack is one of the key components of the engineered barrier system, hence, it is necessary to confirm the applicability of current technique in their manufacture. The required thickness was calculated according to mechanical resistance analysis, based on models used in current nuclear facilities. The Adequacy of the calculated dimensions was confirmed by finite-element methods. To investigate the necessity of a radiation shielding function of the overpack, the irradiation from vitrified waste has been calculated. As a result, it was shown that shielding on handling and transport equipment is a more reasonable and practical approach than to increase thickness of overpack to attain a self-shielding capability. After the above investigation, trial manufacturing of full-scale model of titanium-carbon steel composite overpack has been carried out. For corrosion-resistant material, ASTM Grade-2 titanium was selected. The titanium layer was bonded individually to a cylindrical shell and fiat cover plates (top and bottom) made of carbon steel. For the cylindrical shell portion, a cylindrically formed titanium layer was fitted to the inner carbon steel vessel by shrinkage. For the flat cover plates (top and bottom), titanium plate material was coated by explosive bonding. Electron beam welding and gas metal arc welding were combined to weld of the cover plates to the body. No significant failure was evident from inspections of the fabrication process, and the applicability of current technology for manufacturing titanium-carbon steel composite overpack was confirmed. Future research and development items regarding titanium-carbon steel composite overpacks are also discussed. (author)

  17. Trial manufacturing of titanium-carbon steel composite overpack

    International Nuclear Information System (INIS)

    This paper reports the results of design analysis and trial manufacturing of full-scale titanium-carbon steel composite overpacks. The overpack is one of the key components of the engineered barrier system, hence, it is necessary to confirm the applicability of current technique in their manufacture. The required thickness was calculated according to mechanical resistance analysis, based on models used in current nuclear facilities. The Adequacy of the calculated dimensions was confirmed by finite-element methods. To investigate the necessity of a radiation shielding function of the overpack, the irradiation from vitrified waste has been calculated. As a result, it was shown that shielding on handling and transport equipment is a more reasonable and practical approach than to increase thickness of overpack to attain a self-shielding capability. After the above investigation, trial manufacturing of full-scale model of titanium-carbon steel composite overpack has been carried out. For corrosion-resistant material, ASTM Grade-2 titanium was selected. The titanium layer was bonded individually to a cylindrical shell and fiat cover plates (top and bottom) made of carbon steel. For the cylindrical shell portion, a cylindrically formed titanium layer was fitted to the inner carbon steel vessel by shrinkage. For the flat cover plates (top and bottom), titanium plate material was coated by explosive bonding. Electron beam welding and gas metal arc welding were combined to weld of the cover plates to the body. No significant failure was evident from inspections of the fabrication process, and the applicability of current technology for manufacturing titanium-carbon steel composite overpack was confirmed. Future research and development items regarding titanium-carbon steel composite overpacks are also discussed. (author)

  18. 76 FR 78882 - Carbon and Certain Alloy Steel Wire Rod From Mexico: Affirmative Preliminary Determination of...

    Science.gov (United States)

    2011-12-20

    ... Steel Plate From Canada, 66 FR 7617, 7618 (January 24, 2001)) (Canadian Plate), and accompanying Issued... this order is certain hot-rolled products of carbon steel and alloy steel, in coils, of approximately... International Trade Administration Carbon and Certain Alloy Steel Wire Rod From Mexico: Affirmative...

  19. Development of a robot which inspects inner parts of hydraulic steel pipes. Suiatsu tekkan naibu tenken robot no kaihatsu ni tsuite

    Energy Technology Data Exchange (ETDEWEB)

    Maehara, Masayuki; Taniguchi, Kazuyoshi; Sanemori, Takeshi (Tokyo Electric Power Co., Inc., Tokyo (Japan))

    1989-11-30

    Tokyo Electric Power Co., Ltd. pushes forward energetically the mechanization of investigation, design and operation in order to rationalize the maintenance of equipments and improve work safety. A robot which inspects inner parts of hydraulic steel pipes introduced in this report was investigated and developed as a part of above mechanization. This inspection robot runs in the inner parts of hydraulic steel pipes and inspections of optional positions can be carried out with various inspection equipments loaded on the robot by remote control. The robot{prime}s main body is put in the inner parts of hydraulic steel pipes and the control equipment is put outside. The robot{prime}s main body can be put to pieces of the size and weight that can be carried in through a manhole. Loaded inspection equipments are a visual examination equipment, a still photograph camera, pipe shell thickness measuring and pipe{prime}s internal coating film measuring equipments, and an examination equipment of pin holes in the pipe's internal coating. By the performance confirming test on actual hydraulic steel pipes, it was confirmed that fabrication workability, performance traverse, and inspection capacity of the robot were all sufficiently applicable to actual inspection works. 6 figs., 10 tabs.

  20. 75 FR 18153 - Certain Large Diameter Carbon and Alloy Seamless Standard, Line, and Pressure Pipe From Japan...

    Science.gov (United States)

    2010-04-09

    ... carbon and alloy seamless standard, line, and pressure pipe from Japan, covering the period June 1, 2008... Deferral of Administrative Review, 74 FR 37690 (July 29, 2009). The preliminary results for this... the record. See Certain Large Diameter Carbon and Alloy Seamless Standard, Line and Pressure Pipe...

  1. Electrochemical noise from corroding carbon steel and aluminium

    International Nuclear Information System (INIS)

    Electrochemical noise measurements were conducted on carbon steel and aluminium in sodium chloride solutions. Noise parameters like standard deviation of potential and current, noise resistance, pitting index, noise power were studied for the purpose of measuring corrosion rate. These parameters compared well with the corrosion rate. Pitting index was not very reliable. Current noise was more close to the corrosion rates. General corrosion gave rise to white noise type of power spectrum while flicker noise type of spectrum was obtained from pitting attack. Sodium nitrite is shown to inhibit the corrosion of carbon steel. Aluminium corrodes in the early period of exposure and passivates during long exposure

  2. Modeling Corrosion Reactions of Steel in a Dilute Carbonate Solution

    Science.gov (United States)

    Eliyan, Faysal Fayez; Alfantazi, Akram

    2016-02-01

    This research models the corrosion reactions of a high-strength steel in an aerated, dilute, carbonate solution during a single-cycle voltammetry. Based on a previous study (Eliyan et al. in J Mater Eng Perform 24(6):1-8, 2015) and a literature survey, the corrosion reactions of the cathodic reduction, anodic dissolution, and passivation, as well as the interfacial interactions and the chemistry of the corrosion products are illustrated in schematics. The paper provides a visual guide on the corrosion reactions for steel in carbonate solutions based on the available mechanistic details that were reported and are still being investigated in literature.

  3. Hydrogen-involved fracture toughness behavior of low-alloy primary piping steel

    International Nuclear Information System (INIS)

    The tensile and fracture toughness behavior of hydrogen-charged ASME SA508 Cl.1a low-alloy primary piping steel and the dependence of strain rate at both room and high temperatures were studied. Fracture toughness was estimated by using the modified critical fracture strain model. The test strain rates and temperatures were 8.3 x 10-5, 2.08 x 10-4, 1.25 x 10-3, 0.83 x 10-2 s-1 and 25, 177, 250, 316 .deg. C respectively. The electrolyte for hydrogen charging was made to be 1 N H2SO4 and charging time was 30 minute for each specimen. The effect of cathodic hydrogen charging on the microstructure has also been addressed to confirm that the charging method does not cause any surface damage. At room temperature, the presence of hydrogen led to an increase in yield strength as well as decrease in ductility in all strain rates. Ductility was greatly reduced by the internal atomic hydrogen at lower strain rate about 10-5 s-1 and fracture mode was cleavage type. At high temperatures (177, 250 and 316 .deg. C), hydrogen induced softening and reduction of ductility at strain rates about 10-5, 10-4 and 10-3 s-1. Observable hydrogen effect on yield strength, ductility, serration behavior, and cleavage type fracture was appeared at 177 .deg. C, 10-5 s-1 and 250 .deg. C, 10-3 s-1. Negative strain rate sensitivity was observed at 250 .deg. C from strain rate 10-5 to 10-3 s-1 for both as-received and charged specimens. For as-received condition, fracture toughness was reduced by dynamic strain aging (DSA) effect in 10-5 s-1, 177 .deg. C and in 10-3 s-1, 250 .deg. C. Hydrogen itself didn't produce DSA effect but at the DSA regions it might enhance the DSA effect by about 20% of as-received condition. Fracture toughness was also reduced by internal hydrogen at 10-5 s-1, 316 .deg. C (∼50%): at 10-4 s-1, 250 .deg. C (∼33%) : and at 10-2 s-1,177 and 316 .deg. C (∼33%). The range of fracture toughness for as-received and hydrogen-charged condition was found from 125 to 225 kPa m

  4. Residual stress measurements in carbon steel

    Science.gov (United States)

    Heyman, J. S.; Min, N.

    1986-01-01

    External dc magnetic field-induced changes in natural velocity of Rayleigh surface waves were measured in steel specimens under various stress conditions. The low field slopes of curves representing the fractional changes of natural velocity were proved to provide correct stress information in steels with different metallurgical properties. The slopes of curves under uniaxial compression, exceeding about one third of the yield stress, fell below zero in all the specimens when magnetized along the stress axis. The slopes under tension varied among different steels but remained positive in any circumstances. The stress effect was observed for both applied and residual stress. A physical interpretation of these results is given based on the stress-induced domain structure changes and the delta epsilon effect. Most importantly, it is found that the influence of detailed metallurgical properties cause only secondary effects on the obtained stress information.

  5. Aging of a low alloyed steel piping in a combustioned acidum gas and in a heavy petroleum environment

    International Nuclear Information System (INIS)

    A structural study of a low alloyed steel piping, which is inserted to the entrance of a natural gas burner have been carried out. This steel is similar to the corresponding DIN 20Mn5. The burner has the function of heat the heavy petroleum. In less than a year service occurred an implosion in the part of the piping next to the outlet of a protecting lining of stainless steel ASTM 316. In the implosioned pyro tubular specimen a globular perlitic microstructure was observed, because of the material suffered an aging with thermo fluidity by effect of the high temperature. Concerning the corrosion behaviour were studied the corrosion products obtained both in heat and colder inner parts of the piping, by means x-ray diffraction and infrared spectroscopy. In the erst one, the corrosion layer is porous, and therefore, not protective. There were found mainly: α-FeOOH, β-FeOOH, FeSO4 4H2O, Fe3O4 and CaCO3. In the last one, there are great amounts of yellow corrosion products. From the analysis of the difractograms it could be determined, that the three higher reflections were α- Fe2O3 , γ-Fe2O3 and polymorphic types of iron oxihidroxydes. It was also reported the presence of elemental sulphur. In the hot part of the piping, from the side in contact with natural gas are socavadures present, due to a selective corrosion mechanisms. In this part, but in contact with petroleum, the corrosion has attached the globular perlite. (Full text)

  6. Tracing organic compounds in aerobically altered methane-derived carbonate pipes (Gulf of Cadiz, SW Iberia)

    Science.gov (United States)

    Merinero, Raúl; Ruiz-Bermejo, Marta; Menor-Salván, César; Lunar, Rosario; Martínez-Frías, Jesús

    2012-07-01

    The primary geochemical process at methane seeps is anaerobic oxidation of methane (AOM), performed by methanotrophic archaea and sulfate-reducing bacteria (SRB). The molecular fingerprints (biomarkers) of these chemosynthetic microorganisms can be preserved in carbonates formed through AOM. However, thermal maturity and aerobic degradation can change the original preserved compounds, making it difficult to establish the relation between AOM and carbonate precipitation. Here we report a study of amino acid and lipid abundances in carbonate matrices of aerobically altered pipes recovered from the seafloor of the Gulf of Cadiz (SW Iberian Peninsula). This area is characterized by a complex tectonic regime that supports numerous cold seeps. Studies so far have not determined whether the precipitation of carbonate pipes in the Gulf of Cadiz is a purely chemical process or whether microbial communities are involved. Samples from this site show signs of exposure to oxygenated waters and of aerobic alteration, such as oxidation of authigenic iron sulfides. In addition, the degradation index, calculated from the relative abundance of preserved amino acids, indicates aerobic degradation of organic matter. Although crocetane was the only lipid identified from methanotrophic archaea, the organic compounds detected (n-alkanes, regular isoprenoids and alcohols) are compatible with an origin from AOM coupled with bacterial sulfate reduction (BSR) and subsequent aerobic degradation. We establish a relation among AOM, BSR and pipe formation in the Gulf of Cadiz through three types of analysis: (1) stable carbon and oxygen isotopic composition of carbonate minerals; (2) carbonate microfabrics; and (3) mineralogical composition. Our results suggest that carbonate pipes may form through a process similar to the precipitation of vast amounts of carbonate pavements often found at cold seeps. Our approach suggests that some organic compound patterns, in combination with additional

  7. Volatile corrosion inhibitor film formation on carbon steel surface and its inhibition effect on the atmospheric corrosion of carbon steel

    International Nuclear Information System (INIS)

    A novel volatile corrosion inhibitor (VCI), bis-piperidiniummethyl-urea (BPMU), was developed for temporary protection of carbon steel. Its vapor corrosion inhibition property was evaluated under simulated operational conditions. Electrochemical impedance spectroscopy was applied to study the inhibition effect of BPMU on the corrosion of carbon steel with a thin stimulated atmospheric corrosion water layers. Adsorption of BPMU on carbon steel surfaces was investigated by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The results indicate that BPMU can form a protective film on the metal surface, which protects the metal against further corrosion. The structure of the protective film was suggested as one BPMU molecule chelated with one Fe atom to form a complex with two hexa-rings

  8. Volatile corrosion inhibitor film formation on carbon steel surface and its inhibition effect on the atmospheric corrosion of carbon steel

    Science.gov (United States)

    Zhang, Da-quan; An, Zhong-xun; Pan, Qing-yi; Gao, Li-xin; Zhou, Guo-ding

    2006-11-01

    A novel volatile corrosion inhibitor (VCI), bis-piperidiniummethyl-urea (BPMU), was developed for temporary protection of carbon steel. Its vapor corrosion inhibition property was evaluated under simulated operational conditions. Electrochemical impedance spectroscopy was applied to study the inhibition effect of BPMU on the corrosion of carbon steel with a thin stimulated atmospheric corrosion water layers. Adsorption of BPMU on carbon steel surfaces was investigated by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The results indicate that BPMU can form a protective film on the metal surface, which protects the metal against further corrosion. The structure of the protective film was suggested as one BPMU molecule chelated with one Fe atom to form a complex with two hexa-rings.

  9. Magnetic property variation in carbon steel and chrome-molybdenum steel as a function of uniaxial stress noncoaxial with the magnetic field (abstract)

    International Nuclear Information System (INIS)

    Magnescope1 magnetic measurements were made on carbon steel specimens ranging from 0.1--0.8 wt %C and on chrome-molybdenum steel specimens cut from electric power plant pipes previously in service. The carbon steel specimens were heat-treated using three procedures: (1) spheroidization, (2) quenching, and (3) quench and tempering. The specimens were subjected to uniaxial tension up to 40 ksi. The inspection head was aligned so that the magnetic field was oriented at different angles with respect to the stress axis. Magnetic properties (such as coercivity and maximum differential permeability) were extracted from digitized magnetic hysteresis loop measurements. Magnetic properties were studied as a function of stress at each angle of stress-field orientation. To our knowledge, such a comprehensive study of noncoaxial stress and field effects has never been accomplished before for such a wide variety of steel specimens. Results for the various materials are presented for different orientation angles and compared to numerical results from the noncoaxial magnetomechanical hysteresis model of Sablik et al.2

  10. Measurement of fatigue crack growth rate in pipe and pipe weld

    International Nuclear Information System (INIS)

    Striation spacing on the fracture surface developed during fatigue crack growth in pipes and pipe welds have been examined under scanning electron microscope (SEM). Striation spacing was measured on the fracture surface in maximum depth (radial) and surface (circumferential) direction at several locations. Striation spacing increases with crack growth in thickness (depth) direction of pipe and pipe weld. Local direction of striation spacing is different from the global direction of crack growth in cracked pipe. Striation spacing was compared with the conventionally evaluated crack growth rate where crack growth was measured using Alternate Current Potential Difference (ACPD) based instrument. Striation spacing is marginally lower for carbon steel and higher for stainless steel in comparison to da/dN in the Paris regime (evaluated from 'a Vs N' plot). Striation spacing form fracture surface of pipe was also compared with those measured on CT specimen. (author)

  11. 76 FR 45509 - Final Results of Antidumping Duty Changed Circumstances Review: Carbon and Certain Alloy Steel...

    Science.gov (United States)

    2011-07-29

    ... Circumstances Review: Carbon and Certain Alloy Steel Wire Rod from Mexico, 75 FR 67685 (November 3, 2010...: Carbon and Certain Alloy Steel Wire Rod From Mexico, 71 FR 27989 (May 15, 2006). Notification This notice... of the Order The merchandise subject to this order is certain hot-rolled products of carbon steel...

  12. Effect of Saturated CO2 on Corrosion Behavior of 13Cr Pipe Steel in High Chloride Environment%高氯环境中饱和CO2对13Cr油管钢腐蚀行为的影响

    Institute of Scientific and Technical Information of China (English)

    雷冰; 马元泰; 李瑛; 王福会; 常泽亮; 谢俊峰; 宋文文; 周理志

    2013-01-01

    The effect of saturated CO2 on corrosion behavior of 13Cr pipe steel in high concentration chloride environment was studied by EIS, polarization test, EN test and SEM. The results indicated that the corrosion rate and corrosion probability of 13Cr pipe steel were accelerated in high chloride environment with the presence of saturated CO2. The 13Cr pipe steel suffered from pitting corrosion in high chloride concentration environment, whilst, from uniform corrosion by the synergistic effect of Cl and CO2. The stability of the passive film of 13Cr pipe steel decreased in high concentration chloride environment with saturated CO2, which can be explained by the dehydroxylation of the outer part of the passive film by carbonic acid and the increase of ionic conductivity of the passive film in aqueous electrolytes.%采用电化学阻抗(EIS)、极化曲线、电化学噪声(EN)和扫描电子显微镜(SEM)研究了高氯环境中饱和CO2对13Cr油管钢腐蚀行为的影响.结果表明:饱和CO2加速材料的腐蚀,增大了腐蚀的发生频率,使材料的腐蚀由点蚀转变为均匀腐蚀.碳酸对钝化膜的去羟基化作用和增大钝化膜的导通率,是材料腐蚀行为变化的原因.

  13. Carbon exchange between steel and sodium as a corrosion phenomenon

    International Nuclear Information System (INIS)

    New analytical methods are applied to measure carbon in liquid sodium in the concentration range below 1 μg C/gNa. The carbon exchange between sodium and austenitic steel under decarburising conditions can be understood on the basis of the results of these analyses. The decarburisation of austenitic steel by sodium may cause a corrosive effect of the surface region of the materials. Some tests with the steel no. 1.4948 have demonstrated a reduction of its creep-rupture strength at 550deg C. The corrosion due to decarburisation proceeds slowly, specimens with a larger diameter were not affected, a significant reduction of the creep-rupture strength did not occur. (orig.)

  14. Atmospheric corrosion of carbon steel in the prairie regions

    Energy Technology Data Exchange (ETDEWEB)

    Shaw, W.J. [Calgary Univ., AB (Canada). Dept. of Mechanical and Manufacturing Engineering; Andersson, J.I. [Husky Oil Operations Ltd., Calgary, AB (Canada)

    2010-07-01

    A study of atmospheric corrosion and carbon steel located in the prairie regions of Canada was presented. The study considered corrosion behaviour as well as the standards currently used to establish and predict corrosion in atmospheric conditions. The aim of the study was to develop an accurate predictive method of establishing corrosion amounts over time. The controlling parameters for atmospheric corrosion included acidic rainfall; temperature and humidity; time of wetness; and the presence of major contaminants such as sulfur dioxide (SO{sub 2}). The predictive approach involved the study of a protective film of magnetite iron oxide that establishes itself on carbon steel over time. The presence of the film provides increased atmospheric corrosion resistance. An analysis of the atmospheric corrosion of steel tanks at the Hardisty terminal was used to demonstrate the method. 22 refs., 5 tabs., 7 figs.

  15. Investigation of boron segregation in low carbon steel

    Directory of Open Access Journals (Sweden)

    J. Lis

    2011-04-01

    Full Text Available Traces of born in the range 0,002-0,009 % are usually added to many grades of steel. The effect of boron on phase transformations and hardenability of low carbon low alloy steels depends on the form of its behavior in solid solution either in segregations or in precipitations. Temperature and cooling rate determine the existence of boron segregations on grain boundaries. In present paper simulations of boron concentrations were calculated with computer programme DICTRA for low carbon 0,08 %C steel with 0,006 % boron. Investigations were carried out for temperature 1300 – 700°C and cooling rates from 1°C/s to 100°C/s. The changes of boron concentrations in austenite and ferrite after commencement of γ→α phase transformation were established.

  16. Oxidation of ultra low carbon and silicon bearing steels

    Energy Technology Data Exchange (ETDEWEB)

    Suarez, Lucia [CTM - Technologic Centre, Materials Technology Area, Manresa, Barcelona (Spain)], E-mail: lucia.suarez@ctm.com.es; Rodriguez-Calvillo, Pablo [CTM - Technologic Centre, Materials Technology Area, Manresa, Barcelona (Spain)], E-mail: pablo.rodriguez@ctm.com.es; Houbaert, Yvan [Department of Materials Science and Engineering, University of Ghent (Belgium)], E-mail: Yvan.Houbaert@UGent.be; Colas, Rafael [Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon (Mexico)], E-mail: rcolas@mail.uanl.mx

    2010-06-15

    Oxidation tests were carried out in samples from an ultra low carbon and two silicon bearing steels to determine the distribution and morphology of the oxide species present. The ultra low carbon steel was oxidized for short periods of time within a chamber designed to obtain thin oxide layers by controlling the atmosphere, and for longer times in an electric furnace; the silicon steels were reheated only in the electric furnace. The chamber was constructed to study the behaviour encountered during the short period of time between descaling and rolling in modern continuous mills. It was found that the oxide layers formed on the samples reheated in the electric furnace were made of different oxide species. The specimens treated in the chamber had layers made almost exclusively of wustite. Selected oxide samples were studied by scanning electron microscopy to obtain electron backscattered diffraction patterns, which were used to identify the oxide species in the layer.

  17. Monitoring Techniques for Microbially Influenced Corrosion of Carbon Steel

    DEFF Research Database (Denmark)

    Hilbert, Lisbeth Rischel

    2000-01-01

    Microbially influenced corrosion (MIC) of carbon steel may occur in media with microbiological activity of especially sulphate-reducing bacteria, e.g. on pipelines buried in soil and on marine structures. MIC of carbon steel must be monitored on-line in order to provide an efficient protection and...... control the corrosion. A number of monitoring techniques is industrially used today, and the applicability and reliability of these for monitoring MIC is evaluated. Coupons and ER are recommended as necessary basic techniques even though localised corrosion rate cannot be measured. FSM measures general...... corrosion and detects localised corrosion, but the sensitivity is not high enough for monitoring initiation of pitting and small attacks. Electrochemical techniques as LPR and EIS give distorted data and unreliable corrosion rates, when biofilm and corrosion products cover the steel surface. However, EIS...

  18. Corrosion behavior of carbon steels under tuff repository environmental conditions

    International Nuclear Information System (INIS)

    Carbon steels may be used for borehole liners in a potential high-level nuclear waste repository in tuff in Nevada. Borehole liners are needed to facilitate emplacement of the waste packages and to facilitate retrieval of the packages, if required. Corrosion rates of low carbon structural steels AISI 1020 and ASTM A-36 were determined in J-13 well water and in saturated steam at 1000C. Tests were conducted in air-sparged J-13 water to attain more oxidizing conditions representative of irradiated aqueous environments. A limited number of irradiation corrosion and stress corrosion tests were performed. Chromium-molybdenum alloy steels and cast irons were also tested. These materials showed lower general corrosion but were susceptible to stress corrosion cracking when welded. 4 references, 4 tables

  19. Carbon steel protection in G.S. (Girlder sulfide) plants. Pressure influence on iron sulfide scales formation. Pt. 5

    International Nuclear Information System (INIS)

    In order to protect carbon steel towers and piping of Girlder sulfide (G.S.) experimental heavy water plants against corrosion produced by the action of aqueous solutions of hydrogen sulfide, a method, previously published, was developed. Carbon steel, exposed to saturated aqueous solutions of hydrogen sulfide, forms iron sulfide scales. In oxygen free solutions evolution of corrosion follows the sequence: mackinawite → cubic ferrous sulfide → troilite → pyrrotite → pyrite. Scales formed by pyrrotite-pyrite or pyrite are the most protective layers (these are obtained at 130 deg C, 2MPa, for periods of 14 days). Experiments, at 125 deg C and periods of 10-25 days, were performed in two different ways: 1- constant pressure operations at 0.5 and 1.1 MPa. 2- variable pressure operation between 0.3-1 MPa. In all cases pyrrotite-pyrite scales were obtained. (Author)

  20. Friction and wear characteristics of carbon steels in vacuum

    Science.gov (United States)

    Verkin, B. I.; Lyubarskiy, I. M.; Udovenko, V. F.; Guslyakov, A. A.

    1974-01-01

    The nature of carbon steel friction and wear under vacuum conditions is described within the framework of general friction and wear theory. Friction is considered a dynamic process and wear is considered to be the result of a continuous sequence of transitions of the friction surface material from one state into another.

  1. Carbon distribution in bainitic steel subjected to deformation

    Energy Technology Data Exchange (ETDEWEB)

    Ivanov, Yu. F., E-mail: yufi55@mail.ru [Institute of High Current Electronics SB RAS, Tomsk, 634055 (Russian Federation); National Research Tomsk State University, Tomsk, 634050 (Russian Federation); Nikitina, E. N., E-mail: Nikitina-EN@mail.ru; Gromov, V. E., E-mail: gromov@physics.sibsiu.ru [Siberian State Industrial University, Novokuznetsk, 654007 (Russian Federation)

    2015-10-27

    Analysis of the formation and evolution of carbide phase in medium carbon steel with a bainitic structure during compressive deformation was performed by means of transmission electron diffraction microscopy. Qualitative transformations in carbide phase medium size particles, their density and volume concentration depended on the degree of deformation.

  2. Nondestructive evaluation of residual stress in low-carbon steel

    Science.gov (United States)

    Salama, K.

    1984-01-01

    The effects of the preferred orientation on the temperature dependence of ultrasonic velocity in low carbon steels are investigated. The sensitivity of the acousto-elastic constant to changes in microstructure is assessed as well as the possibility of determining some mechanical properties of a material by measuring the acousto-elastic constant.

  3. Microbial corrosion of carbon steel by sulfate-reducing bacteria:

    DEFF Research Database (Denmark)

    Nielsen, Lars Vendelbo; Hilbert, Lisbeth Rischel

    1997-01-01

    Electrochemical measurements (EIS and DC-polarisation curves) have been conducted on carbon steel coupons exposed in SRB-active environments. Results from EIS measurements show that very large interfacial capacities are found in such systems, and consequently high capacitive currents are to be ex...... misleading conclusion that increasing corrosion rates are caused by cathodic depolarisation in SRB-active environments....

  4. Carbon distribution in bainitic steel subjected to deformation

    International Nuclear Information System (INIS)

    Analysis of the formation and evolution of carbide phase in medium carbon steel with a bainitic structure during compressive deformation was performed by means of transmission electron diffraction microscopy. Qualitative transformations in carbide phase medium size particles, their density and volume concentration depended on the degree of deformation

  5. Vanadium Effect on a Medium Carbon Forging Steel

    Directory of Open Access Journals (Sweden)

    Carlos Garcia-Mateo

    2016-05-01

    Full Text Available In the present work the influence of vanadium on the hardenability and the bainitic transformation of a medium carbon steel is analyzed. While V in solid solution enhances the former, it hardly affects bainitic transformation. The results also reveal an unexpected result, an increase of the prior austenite grain size as the V content increases.

  6. Laser-ultrasonic absorption measurements in low carbon steels

    Energy Technology Data Exchange (ETDEWEB)

    Moreau, A.; Lord, M.; Levesque, D.; Dubois, M.; Bussiere, J.F. [Institut des Materiaux Industriels, Boucherville, Que. (Canada)

    2000-09-28

    We have refined the contactless laser-ultrasound reverberation technique to measure ultrasonic absorption on small metallic samples. In this technique, a sample is supported by a holder which is ultrasonically decoupled from the sample. A pulsed laser is used to generate an acoustic pulse. After the pulse has mode converted and scattered sufficiently to fully insonify the sample, the decrease in the noise-like ultrasonic signal is recorded as a function of time using a laser-interferometer. A joint time-frequency analysis technique is used to extract an absorption spectrum from the signal. In this paper, the technique is demonstrated in a frequency bandwidth ranging from 1 to 7 MHz, and in a dynamic range of 0.003 to 0.3 dB {mu}s{sup -1}. Measurements made on samples of three low-carbon steel grades, namely ultra low carbon (ULC), low carbon (LC), and high strength, low-alloy steels (HSLA), clearly show that ultrasonic absorption varies with steel grade. The technique was utilized to study the effect of a magnetic field on the ultrasonic absorption of an annealed ultra low carbon steel sample. It was found that magnetoelastic effects are responsible for a large fraction of the total absorption. (orig.)

  7. Numerical simulation and experimental investigation of laser dissimilar welding of carbon steel and austenitic stainless steel

    Science.gov (United States)

    Nekouie Esfahani, M. R.; Coupland, J.; Marimuthu, S.

    2015-07-01

    This study reports an experimental and numerical investigation on controlling the microstructure and brittle phase formation during laser dissimilar welding of carbon steel to austenitic stainless steel. The significance of alloying composition and cooling rate were experimentally investigated. The investigation revealed that above a certain specific point energy the material within the melt pool is well mixed and the laser beam position can be used to control the mechanical properties of the joint. The heat-affected zone within the high-carbon steel has significantly higher hardness than the weld area, which severely undermines the weld quality. A sequentially coupled thermo-metallurgical model was developed to investigate various heat-treatment methodology and subsequently control the microstructure of the HAZ. Strategies to control the composition leading to dramatic changes in hardness, microstructure and service performance of the dissimilar laser welded fusion zone are discussed.

  8. 75 FR 64254 - Certain Hot-Rolled Flat-Rolled Carbon Quality Steel Products From Brazil; Final Results of...

    Science.gov (United States)

    2010-10-19

    ... ] (HSLA) steels, and the substrate for motor lamination steels. IF steels are recognized as low carbon... and nitrogen elements. HSLA steels are recognized as steels with micro- alloying levels of elements... Carbon-Quality Steel Products from the Russian Federation, 65 FR 5510, 5518 (February 4, 2000)...

  9. 75 FR 19369 - Certain Hot-Rolled Flat-Rolled Carbon Quality Steel Products from Brazil: Preliminary Results of...

    Science.gov (United States)

    2010-04-14

    ...-free (IF)) steels, high strength low alloy (HSLA) steels, and the substrate for motor lamination steels... and/or niobium added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels... Carbon Quality Steel Products from Brazil, 67 FR 11093 (March 12, 2002) (Antidumping Order). ] On March...

  10. 76 FR 66901 - Certain Hot-Rolled Carbon Steel Flat Products From the People's Republic of China: Final...

    Science.gov (United States)

    2011-10-28

    ...), or both, added to stabilize carbon and nitrogen elements. HSLA steels are recognized as steels with...'') steels, and the substrate for motor lamination steels. IF steels are recognized as low carbon steels with... Rescind the Review, 76 FR 48143 (August 8, 2011) (``Preliminary Results''). ] DATES: Effective...

  11. 75 FR 4779 - Certain Cut-to-Length Carbon-Quality Steel Plate Products From Italy: Preliminary Results of...

    Science.gov (United States)

    2010-01-29

    ... (HSLA) steels. HSLA steels are recognized as steels with micro-alloying levels of elements such as...-Rolled Flat-Rolled Carbon-Quality Steel Products From Japan, 64 FR 24329 (May 6, 1999). In Nippon Steel... Value: Certain Cut-To-Length Carbon-Quality Steel Plate Products From Italy, 64 FR 41213 (July 29,...

  12. 77 FR 32513 - Hot-Rolled Flat-Rolled Carbon-Quality Steel Products From the Russian Federation; Preliminary...

    Science.gov (United States)

    2012-06-01

    ... alloy (``HSLA'') steels, and the substrate for motor lamination steels. IF steels are recognized as low... carbon and nitrogen elements. HSLA steels are recognized as steels with micro-alloying levels of elements... Carbon-Quality Steel Products From the Russian Federation, 64 FR 38626 (July 19, 1999). Likewise,...

  13. Finite Element Analysis of Modeling Residual Stress Distribution in All-position Duplex Stainless Steel Welded Pipe

    Institute of Scientific and Technical Information of China (English)

    Xiaojun JIN; Lixing HUO; Yufeng ZHANG; Bingren BAI; Xiaowei LI; Jun CAO

    2004-01-01

    On the basis of the thermal-elastic-plastic theory, a three-dimensional finite element numerical simulation is performed on the girth welded residual stresses of the duplex stainless steel pipe with ANSYS nonlinear finite element program for the first time. Three-dimensional FEM using mobile heat source for analysis transient temperature field and welding stress field in circumferential joint of pipes is founded. Distributions of axial and hoop residual stresses of the joint are investigated. The axial and the hoop residual stresses at the weld and weld vicinity on inner surface of pipes are tensile, and they are gradually transferred into compressive with the increase of the departure from the weld. The axial residual stresses at the weld and weld vicinity on outer surface of pipes is compressive while the hoop one is tensile. The distributions of residual stresses compared positive-circle with negative-circle show distinct symmetry. These results provide theoretical knowledge for the optimization of process and the control of welding residual stresses.

  14. Corrosion behaviour of carbon steel in the Tournemire clay

    International Nuclear Information System (INIS)

    Carbon steels are possible materials for the fabrication of nuclear waste containers for long term geological disposal in argillaceous environments. Experimental studies of the corrosion behaviour of such materials has been conducted in various conditions. Concerning the numerous laboratory experiments, these conditions (water and clay mixture or compacted clay) mainly concern the bentonite clay that would be used for the engineered barrier. On the opposite, only few in-situ experiments has been conducted directly in the local clay of the repository site (such as Boom clay, etc.). In order to better estimate the corrosion behaviour of carbon steels in natural clay site conditions, an experimental study has been conducted jointly by EDF and IRSN in the argillaceous French site of Tournemire. In this study, A42 carbon steel specimens have been exposed in 3 different zones of the Tournemire clay formation. The first type of environmental conditions concerns a zone where the clay has not been affected by the excavation (EDZ) of the main tunnel neither by the main fracture zone of the clay formation. The second and third ones are located in the EDZ of the tunnel. In the second zone, an additional aerated water flows from the tunnel, whereas it does not in the third place. Some carbon steel specimens have been extracted after several years of exposure to these conditions. The average corrosion rate has been measured by the weight loss technique and the pitting corrosion depth has been evaluated under an optical microscope. Corrosion products have also been characterised by scanning electron microscopy and X-ray diffraction technique. Results are then discussed regarding the surrounding environmental conditions. Calculations of the oxygen transport from the tunnel through the clay and of the clay re-saturation can explain, in a first approach, the corrosion behaviour of the carbon steel in the different tested zones. (authors)

  15. Mechanical properties and fatigue strength of high manganese non-magnetic steel/carbon steel welded joints

    International Nuclear Information System (INIS)

    The dissimilar materials welded joints of high manganese non-magnetic steel/carbon steel (hereafter referred to as DMW joints), in which weld defects such as hot crack or blowhole are not found, were the good quality. Tensile strength of DMW joints was 10% higher than that of the base metal of carbon steel. In the bend tests, the DMW joints showed the good ductility without crack. Charpy absorbed energy at 0(degC) of the DMW joints was over 120(J) in the bond where it seems to be the lowest. Large hardening or softening was not detected in the heat affected zone. Fatigue strength of the DMW joints is almost the same with that of the welded joints of carbon steel/carbon steel. As the fatigue strength of the DMW joints exceeds the fatigue design standard curve of JSSC for carbon steel welded joints, the DMW joints can be treated the same as the welded joints of carbon steel/carbon steel of which strength is lower than that of high manganese non-magnetic steel, from the viewpoint of the fatigue design. (author)

  16. Study of Mechanical Properties and Characterization of Pipe Steel welded by Hybrid (Friction Stir Weld + Root Arc Weld) Approach

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Yong Chae [ORNL; Sanderson, Samuel [MegaStir Technologies LLC; Mahoney, Murray [Consultant; Wasson, Andrew J [ExxonMobil, Upstream Research Company (URC); Fairchild, Doug P [ExxonMobil, Upstream Research Company (URC); Wang, Yanli [ORNL; Feng, Zhili [ORNL

    2015-01-01

    Friction stir welding (FSW) has recently attracted attention as an alternative construction process for gas/oil transportation applications due to advantages compared to fusion welding techniques. A significant advantage is the ability of FSW to weld the entire or nearly the entire wall thickness in a single pass, while fusion welding requires multiple passes. However, when FSW is applied to a pipe or tube geometry, an internal back support anvil is required to resist the plunging forces exerted during FSW. Unfortunately, it may not be convenient or economical to use internal backing support due to limited access for some applications. To overcome this issue, ExxonMobil recently developed a new concept, combining root arc welding and FSW. That is, a root arc weld is made prior to FSW that supports the normal loads associated with FSW. In the present work, mechanical properties of a FSW + root arc welded pipe steel are reported including microstructure and microhardness.

  17. Analysis of a premature failure of welded AISI316L stainless steel pipes originated by microbial induced corrosion

    Energy Technology Data Exchange (ETDEWEB)

    Otero, E.; Bastidas, J.M.; Lopez, V. [Centro Nacional de Investigaciones Metalurgicas, Madrid (Spain)

    1997-07-01

    This paper analyses the causes of the premature failure of welded AISI 316L stainless steel (ss) pipes which formed part of a sea water cooling circuit. The service time of the pipes was 8 months. The laboratory tests carried out consisted of metallography tests, {delta}-ferrite determination, intergranular corrosion susceptibility, cyclic anodic polarization curves, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray photo-electron spectroscopy (XPS). The study presents typical forms of microbial induced corrosion (MIC) in AISI 308L and 316L ss in contact with natural sea water. The research is completed with the performance of bacteriological tests which demonstrate that the bacteria which cause the localized corrosion are of the sulphate-reducing genus ``desulfovibrio`` and the sulphide-oxidizing genus ``thiocapsa``. (orig.) 17 refs.

  18. Detection and sizing of large-scale cracks in centrifugally cast stainless steel pipes using Lamb waves

    International Nuclear Information System (INIS)

    Application of conventional ultrasonic nondestructive evaluation (NDE) techniques to centrifugally cast stainless steel (CCSS) pipes in pressurized water reactors (PWRs) has been limited, mainly due to the anisotropy of the CCSS materials. Phenomena such as beam skewing and distortion are directly attributable to this anisotropy and cause severe difficulties in crack detection and sizing. To improve CCSS inspectability, the feasibility of using Lamb waves as the probing mechanism for detecting and characterizing a surface-breaking crack originating from the pipe interior surface is discussed. A similar research effort has been reported by Rokhlin who investigated the interaction of Lamb waves with delaminations in thin sheets. Rokhlin and Adler also reported recently on the use of Lamb waves for evaluating spot welds. The motivation for using this probing mechanism derives from the recognition that the difficulties introduced by beam skewing, beam distortion, and high attenuation are circumvented, since Lamb waves are not bulk waves, but are resonant vibrational modes of a solid plate

  19. Comprehensive Application of Steel Reinforced Concrete Jacking Pipe and Sand Glass Fiber Reinforced Plastic Pipe%钢筋混凝土管顶管与夹砂玻璃钢管的综合应用

    Institute of Scientific and Technical Information of China (English)

    李之国

    2009-01-01

    该文介绍了采用DN2200钢筋混凝土管作为穿越管道进行顶管施工,然后在钢筋混凝土管内安装DNl800承插式夹砂玻璃钢管相结合的施工方法.此施工方法可有效地解决埋深较大的市政污水压力管道工程的施工技术问题.现供从事市政污水压力管道工程施工的同行参考.%The article introduces the construction of jacking pipe by using DN2200 steel reinforced concrete pipe as the crossing pipe, and the construction method of then installing DN1800 socket-and-spigot sand glass fiber reinforced plastic pipe into the steel reinforced concrete pipe. This construction method can efficiently solve the construction technical problems of the deeper embedded municipal sewage pressure pipe, which can provide the reference for the construction of the municipal sewage pressure pipe.

  20. The tensile capacity of steel pipe piles drilled into the bedrock

    OpenAIRE

    Sirén, Rosa

    2015-01-01

    This Master’s thesis focuses on drilled pipe piles and their ability to transfer tensile forces. The tensile forces affecting pile foundations are usually transferred to the bedrock by rock anchors. If drilled pipe piles could transfer some of these tension forces, foundation work would be faster, easier and more cost-effective. This thesis is a continuation of a study published in 2014, which also investigated the tensile capacity of drilled pipe piles. This thesis consists of two main ...

  1. Elastic Sag Property of Low Carbon Martensite Spring Steel

    Institute of Scientific and Technical Information of China (English)

    LI Ye-sheng; CHEN Mi-song; WU Zi-ping; ZHU Yin-lu; DUO Tie-yun

    2004-01-01

    This paper studies the elastic sag resistance of new low-carbon martensite spring steel 35Si2CrVB developed recently and points out that the cause of elastic sag is attributed to cyclic softening of spring steel engendered during its serving,also considers that elastic sag property should be evaluated by dynamic mechanical properties of spring material such as dynamic yield strength σ'0.2, ratio of dynamic yield strength σ'0.2 vs. tensile strength σb (σ'0.2/σb) and ratio of dynamic yield strength σ' 0.2vs. static yield strengthσ0.2 (σ'0.2/σ0. 2 )etc. , which are measured by the cyclic stress-strain curve test. Compared with conventional spring steel 60Si2MnA, 35Si2CrVB has good advantages in both dynamic and static properties, which show it possesses higher elastic sag resistance than 60Si2MnA because of its lath-martensite structure tempering in low temperature different from 60Si2MnA steel's plate martensite structure tempering inmedium temperature. So it can be demonstrated that low carbon martensite spring steel is more appropriate for the demands of spring.

  2. Uniaxial Fatigue of HDPE-100 Pipe. Experimental Analysis

    OpenAIRE

    Djebli, A.; A. Aid; M. Bendouba; Talha, A.; Benseddiq, N.; M. Benguediab; S. Zengah

    2014-01-01

    In this paper, an experimental analysis for determining the fatigue strength of PE-100, one of the most used High Density Polyethylene (HDPE) materials for pipes, under cyclic axial loadings is presented. HDPE is a thermoplastic material used for piping systems, such as natural gas distribution systems, sewer systems and cold water systems, which provides a good alternative to metals such as cast iron or carbon steel. One of the causes for failures of HDPE pipes is fatigue which is the result...

  3. CARBON DIFFUSION IN CARBON-SUPERSATURATED 9CR-1MO STEEL: ANOMALOUS TEMPERATURE DEPENDENCE OF CARBON DIFFUSIVITY

    Czech Academy of Sciences Publication Activity Database

    Čermák, Jiří; Král, Lubomír

    Ostrava : Tanger Ltd, 2014. ISBN 978-80-87294-52-9. [Metal 2014. International Conference on Metallurgy and Materials /23./. Brno (CZ), 21.05.2014-23.05.2014] R&D Projects: GA ČR(CZ) GAP108/11/0148; GA MŠk(CZ) ED1.1.00/02.0068 Institutional support: RVO:68081723 Keywords : Diffusion * Carbon * phase decomposition * Carbon-supersaturation * Cr-Mo steels Subject RIV: BJ - Thermodynamics http://www.metal2014.com/cz/zobrazit-seznam-prispevku/2498-carbon-diffusion-in-carbon-supersaturated-9cr-1mo-steel-anomalous-temperature-dependence-of-carbon-diffusivity/

  4. Microbiological Corrosion in Low Carbon Steels

    Directory of Open Access Journals (Sweden)

    O. Medina–Custodio

    2009-01-01

    Full Text Available The Microbiologically Induced Corrosion affects several industries, such as oil industry where it is estimated that 20% to 30% pipes failures are related with microorganism . The chemical reactions generate ions transfer, this validate the use of electrochemical techniques for its analysis. Coupons submerged in a nutritional medium with presence and absence of three different microorganisms during two periods, 48 hours and 28 days we restudied. Polarization resistance (Rp and Electrochemical Impedance Spectroscopy (EIS techniques we re applied to determine the corrosivity of the systems. The results show a greater corrosive effect of abiotic system, this indicates a microorganisms protection effect to the metal, opposite to the first hypothesis. This result was ratified observing surfaces coupons by using Scanning Electron Microscopy (SEM technique. A possible mechanism based on Evans – Tafel graph is proposed to explain inhibitor microorganism effect.

  5. Nanoscopic strength analysis of work-hardened low carbon austenitic stainless steel, 316SS

    International Nuclear Information System (INIS)

    Stress corrosion cracking (SCC) occurs in shrouds and piping of low carbon austenitic stainless steels at nuclear power plants. A work-hardened layer, where the transgranular SCC initiates, is considered to be one of the probable cause for this occurrence. In order to clarify the microstructural characteristics of work-hardened layer at the surface of shrouds or piping, the strengthen analysis of low carbon austenitic stainless steel, 316SS, rolled at the reduction in area, RA, of 10, 20, 30, 40 and 50% at room temperature were conducted on a nanoscopic scale, using an ultra-microhardness tester, TEM and SEM. TEM and SEM observation showed that the microstructural parameters are the dislocation cell size, dcel, coarse slip spacing, lcsl, and austenitic grain size, dγ. Referring 10dcel and 10lcsl, Vickers hardness, HV, corresponding to macro strength was expressed as Hυ=Hυ*bas + Hυ*sol + Hυ*dis + Hυ*cel + Hυ*csl. Hυ*bas (=100) is the base hardness, Hυ*sol is the solid solution strengthening hardness, Hυ*dis is the dislocation strengthening hardness in the dislocation cell, and Hυ*cel and Hυ*csl are the fine grain strengthening hardness due to the dislocation cell and coarse slip. Hυ*sol was about 50, independently of RA. Hυ*dis was zero at RA 30%. Hυ*cel and Hυ*csl increased with increasing in RA and were kept constant at about 50 and 120 at RA=20 and 30%, respectively. It was suggested from these results that all dislocations introduced by rolling might be dissipated for the creation of dislocation cells and coarse slips at RA 30%. (author)

  6. Behavior of a piping system under seismic excitation. Experimental investigations of a spatial piping system supported by mechanical shock arrestors and steel energy absorbing devices under seismic excitation

    International Nuclear Information System (INIS)

    The specimen studied was a half-scale model of a piping system from a nuclear reactor power plant. This was tested in its original design configuration using mechanical shock arrestors (snubbers), and subsequently in a revised configuration using ductile steel energy absorbers. The influence of the snubbers and of different energy absorbers on the dynamic response of the pipe system is discussed; a direct one-to-one replacement of the snubbers by energy absorbers allows a direct comparison of the results. The response of the structure was studied under all three direction components of ground motions, though a maximum of two components (one horizontal and the vertical) was applied simultaneously. In the case of the energy absorbers, the effect of a thermal loading was simulated by a deforming system at the restrainers, and the seismic loading was superimposed on this biased configuration. Over a hundred test runs were recorded using four different artificial earthquakes as well as sinusoidal input. A study of damping behavior, frequency spectra and hysteresis loops for both shock arrestors and energy absorbers facilitates an extensive interpretation of the experimental data

  7. Intragranular ferrite in inoculated low-carbon steels

    International Nuclear Information System (INIS)

    Inoculated low-carbon plate steels have been developed which provide improved low temperature toughness compared with conventional HSLA steels, and also exhibit better weldability with high heat input welding processes. These characteristics make inoculated steels suitable for large structures in severe environments. The improved toughness and weldability are attributed to the formation of microstructures containing fine, intragranular ferrite which nucleates on inclusion dispersions, similar to acicular ferrite formation in weld metals. The development of various inoculated steels is described and the role of inclusions in intragranular ferrite formation is reviewed. The primary role of inclusions is to provide heterogeneous nucleation sites, but nucleation appears to be enhanced to a certain extent by a number of other phenomena at the inclusion surface. Various phases have been shown to enhance intragranular ferrite nucleation, and the most effective of these for inoculation of plate steels are phases rich in titanium and oxygen. Inoculated Ti-O steels have found limited commercial acceptance, but further development depends on achievement of reliable steelmaking technology to optimise microstructural control with particles

  8. Morphological and microstructural studies on aluminizing coating of carbon steel

    International Nuclear Information System (INIS)

    Hot dip aluminizing is one of the most effective methods of surface protection for steels and is gradually gaining popularity. The morphology and microstructure of an inter-metallic layer form on the surface of low carbon steel by hot dip aluminization treatment had been studied in detail. This effect has been investigated using optical and scanning electron microscopy, and X-ray diffraction. The result shows that the reaction between the steel and the molten aluminium leads to the formation of Fe–Al inter-metallic compounds on the steel surface. X-ray diffraction and electron microscopic studies showed that a two layer coating was formed consisting of an external Al layer and a (Fe2Al5) inter metallic on top of the substrate after hot dip aluminizing process. The inter-metallic layer is ‘thick’ and exhibits a finger-like growth into the steel. Microhardness testing shown that the intermetallic layer has high hardness followed by steel substrate and the lowest hardness was Al layer

  9. Weldability of Low Carbon Transformation Induced Plasticity Steel

    Institute of Scientific and Technical Information of China (English)

    ZHANG Mei; LI Lin; FU Ren-yu; ZHANG Ji-cheng; WAN Zi

    2008-01-01

    Transformation induced plasticity (TRIP) steel exhibited high or rather high carbon equivalent (CE) because of its chemical composition,which was a particularly detrimental factor affecting weldability of steels.Thus the weldability of a TRIP steel (grade 600) containing (in mass percent,%) 0.11C-1.19Si-1.67Mn was extensively studied.The mechanical properties and impact toughness of butt joint,the welding crack susceptibility of weld and heat affected zone (HAZ) for tee joint,control thermal severity (CTS) of the welded joint,and Y shape 60° butt joint were measured after the gas metal arc welding (GMAW) test.The tensile strength of the weld was higher than 700 Mpa.Both in the fusion zone (FZ) and HAZ for butt joint,the impact toughness was much higher than 27 J,either at room temperature or at -20 ℃,indicating good low temperature impact ductility of the weld of TRIP 600 steel.In addition,welding crack susceptibility tests revealed that weldments were free of surface crack and other imperfection.All experimental results of this steel showed fairly good weldability.For application,the crossmember in automobile made of this steel exhibited excellent weldability,and fatigue and durability tests were also accomplished for crossmember assembly.

  10. Gas phase hydrogen permeation in alpha titanium and carbon steels

    Science.gov (United States)

    Johnson, D. L.; Shah, K. K.; Reeves, B. H.; Gadgeel, V. L.

    1980-01-01

    Commercially pure titanium and heats of Armco ingot iron and steels containing from 0.008-1.23 w/oC were annealed or normalized and machined into hollow cylinders. Coefficients of diffusion for alpha-Ti and alpha-Fe were determined by the lag-time technique. Steady state permeation experiments yield first power pressure dependence for alpha-Ti and Sievert's law square root dependence for Armco iron and carbon steels. As in the case of diffusion, permeation data confirm that alpha-titanium is subject to at least partial phase boundary reaction control while the steels are purely diffusion controlled. The permeation rate in steels also decreases as the carbon content increases. As a consequence of Sievert's law, the computed hydrogen solubility decreases as the carbon content increases. This decreases in explained in terms of hydrogen trapping at carbide interfaces. Oxidizing and nitriding the surfaces of alpha-titanium membranes result in a decrease in the permeation rate for such treatment on the gas inlet surfaces but resulted in a slight increase in the rate for such treatment on the gas outlet surfaces. This is explained in terms of a discontinuous TiH2 layer.

  11. Anticorrosive Influence of Acetobacter aceti Biofilms on Carbon Steel

    Science.gov (United States)

    France, Danielle Cook

    2016-07-01

    Microbiologically influenced corrosion (MIC) of carbon steel infrastructure is an emerging environmental and cost issue for the ethanol fuel industry, yet its examination lacks rigorous quantification of microbiological parameters that could reveal effective intervention strategies. To quantitatively characterize the effect of cell concentration on MIC of carbon steel, numbers of bacteria exposed to test coupons were systematically controlled to span four orders of magnitude throughout a seven-day test. The bacterium studied, Acetobacter aceti, has been found in ethanol fuel environments and can convert ethanol to the corrosive species acetic acid. A. aceti biofilms formed during the test were qualitatively evaluated with fluorescence microscopy, and steel surfaces were characterized by scanning electron microscopy. During exposure, biofilms developed more quickly, and test reactor pH decreased at a faster rate, when cell exposure was higher. Resulting corrosion rates, however, were inversely proportional to cell exposure, indicating that A. aceti biofilms are able to protect carbon steel surfaces from corrosion. This is a novel demonstration of corrosion inhibition by an acid-producing bacterium that occurs naturally in corrosive environments. Mitigation techniques for MIC that harness the power of microbial communities have the potential to be scalable, inexpensive, and green solutions to industrial problems.

  12. Mechanistic Understanding Of Caustic Cracking Of Carbon Steels

    International Nuclear Information System (INIS)

    Liquid waste generated by the PUREX process for separation of nuclear materials is concentrated and stored in Type IV single-shell carbon steel tanks at the Savannah River Site (SRS). The Type IV tanks for this waste do not have cooling coils and have not undergone heat treatment to stress-relieve the tanks. After the waste is concentrated by evaporation, it becomes very alkaline and can cause stress corrosion cracking (SCC) and pitting corrosion of the tank materials. SRS has experienced leakage from non-stress-relieved waste tanks constructed of A285 carbon steel and pitting of A212 carbon steel tanks in the vapor space. An investigation of tank materials has been undertaken at SRS to develop a basic understanding of caustic SCC of A285 and A212 grade carbon steels exposed to aqueous solutions, primarily containing sodium hydroxide (NaOH), sodium nitrate (NaNO3), and sodium nitrite (NaNO2) at temperatures relevant to the operating conditions of both the F and H area plants. This report presents the results of this corrosion testing program. Electrochemical tests were designed using unstressed coupons in a simulated tank environment. The purpose of this testing was to determine the corrosion susceptibility of the tank materials as a function of chemical concentration, pH, and temperature. A285 and A516 (simulates A212 carbon steel) coupons were used to investigate differences in the corrosion of these carbon steels. Electrochemical testing included measurement of the corrosion potential and polarization resistance as well as cyclic potentiodynamic polarization (CPP) testing of coupons. From the CPP experiments, corrosion characteristics were determined including: corrosion potential (Ecorr), pitting or breakdown potential (Epit), and repassivation potential (Eprot). CPP results showed no indications of localized corrosion, such as pitting, and all samples showed the formation of a stable passive layer as evidenced by the positive hysteresis during the scan

  13. Evaluation of Flow Accelerated Corrosion of Carbon Steel with Rotating Cylinder

    International Nuclear Information System (INIS)

    Flow accelerated corrosion (FAC) of the carbon steel piping in nuclear power plants (NPPs) has been major issue in nuclear industry. Rotating cylinder FAC test facility was designed and fabricated and then performance of the facility was evaluated. The facility is very simple in design and economic in fabrication and can be used in material and chemistry screening test. The facility is equipped with on line monitoring of pH, conductivity, dissolved oxygen(DO), and temperature. Fluid velocity is controlled with rotating speed of the cylinder with a test specimen. FAC test of SA106 Gr. B carbon steel under 4 m/s flow velocity was performed with the rotating cylinder at DO concentration of less than 1 ppb and of 1.3 ppm. Also a corrosion test of the carbon steel at static condition, that is at zero fluid velocity, of test specimen and solution was performed at pH from 8 to 10 for comparison with the FAC data. For corrosion test in static condition, the amount of non adherent corrosion product was almost constant at pH ranging from 8 to 10. But adherent corrosion product decreased with increasing pH. This trend is consistent with decrease of Fe solubility with an increase in pH. For FAC test with rotating cylinder FAC test facility, the amount of non adherent corrosion product was also almost same for both DO concentrations. The rotating cylinder FAC test facility will be further improved by redesigning rotating cylinder and FAC specimen geometry for future work

  14. Market Demand Forecast and Analysis on China Steel Pipe in 2013%2013年中国钢管市场需求预测与分析

    Institute of Scientific and Technical Information of China (English)

    彭在美

    2013-01-01

    In this article,it summarized macro-economic situation of the world and China in 2013,and forecasted the growth of world economic will be increased by 3.6%,the China GDP will be enhanced by 8%,the growth of steel consumption will be increased by 4%.Based on this,it predicted the growth rate of China steel pipe is 3%,the foreign trade growth rate of steel pipe is 4%.In view of the above,it forecasted that the market demand of China steel pipe is 7 800×104 t,including 2 900×104 t seamless steel pipe,4 900×104 t welded pipe; the total exported amounts is 920×104 t,including 540×104 t seamless steel pipe,380×104 t welded pipe.It also analyzed the market demand situations of 14 industries of steel pipe application in 2013,and expatiated China steel pipe industry how to adapt to market demand.%概述了2013年世界及中国宏观经济形势,预测世界经济增长3.6%,中国GDP增长8%,中国钢材消费量增长4%,由此判断中国钢管消费量增长3%,钢管出口增长4%,据此推算,2013年中国钢管市场需求约为7 800×104t,其中无缝管为2 900×104t,焊管为4 900×104t;钢管出口为920×104t,其中无缝管为540×104t,焊管为380×104 t.分析了14个主要钢管应用行业2013年的市场需求情况,并对中国钢管行业如何适应市场需求进行了阐述.

  15. Microstructure in unbent and as-hot bent segments of thick-walled P92 steel pipe

    Czech Academy of Sciences Publication Activity Database

    Král, Petr; Sklenička, Václav; Kuchařová, Květa; Kvapilová, Marie; Svobodová, M.; Horváth, L.

    Zurich : Trans Tech Publications, 2015 - (Ofenheimer, A.; Poletti, C.; Schalk-Kitting, D.; Sommitsch, C.), s. 53-58 ISBN 978-3-03835-471-0. ISSN 1013-9826. - (Key Engineering Materials. 651-653). [ESAFORM 2015 - International ESAFORM Conference on Material Forming /18./. Graz (AT), 15.04.2015-17.04.2015] R&D Projects: GA TA ČR TA02010260 Institutional support: RVO:68081723 Keywords : hot bending * P92 steel pipe * creep behaviour * microstructure * EBSD Subject RIV: JG - Metallurgy

  16. Cracking in stabilized austenitic stainless steel piping of German boiling water reactors - characteristic features and root cause

    International Nuclear Information System (INIS)

    Cracks have been found in the welds of piping systems made from stabilized austenitic stainless steels in German boiling water reactors (BWR). In the course of the intensive failure analysis metallographic examinations, microstructural investigations by electron microscopy, corrosion experiments and welding tests have been performed. The results show that cracking under the given medium conditions is due to intergranular stress corrosion cracking (IGSCC) in those parts of the heat affected zone (HAZ) which are overheated during welding and where solution of titanium carbides and subsequent precipitation of chromium carbides and depletion of chromium along the affected grain boundaries could occur. (orig.)

  17. FLOW PATTERN AND PRESSURE LOSS OF OIL-WATER TWO-PHASE FLOW IN HORIZONTAL STEEL PIPE

    Institute of Scientific and Technical Information of China (English)

    CHEN Jie; YAN Da-fan; ZHAO Jing-mei; AN Wei-jie; YAN Da-chun

    2005-01-01

    Experimental Study on oil-water two-phase flow patterns and pressure loss was conducted on a horizontal steel pipe loop with 26.1mm inner diameter and 30m total length.The working fluids are white oil, diesel oil and tap water.Several instruments, including a new type of liquid-probe are successfully integrated to identify 7 different flow patterns.The characteristics of the flow patterns and the transition process were observed and depicted in this paper.Investigation revealed that the pressure loss was mainly depended on the flow patterns.

  18. Aerosol measurements from plasma torch cuts on stainless steel, carbon steel, and aluminum

    International Nuclear Information System (INIS)

    The main purpose of this project is to quantify aerosol particle size and generation rates produced by a plasma torch whencutting stainless steel, carbon steel and aluminum. the plasma torch is a common cutting tool used in the dismantling of nuclear facilities. Eventually, other cutting tools will be characterized and the information will be compiled in a user guide to aid in theplanning of both D ampersand D and other cutting operations. The data will be taken from controlled laboratory experiments on uncontaminated metals and field samples taken during D ampersand D operations at ANL nuclear facilities. The plasma torch data was collected from laboratory cutting tests conducted inside of a closed, filtered chamber. The particle size distributions were determined by isokinetically sampling the exhaust duct using a cascade impactor. Cuts on different thicknesses showed there was no observable dependence of the aerosol quantity produced as a function of material thickness for carbon steel. However, data for both stainless steel and aluminum revealed that the aerosol mass produced for these materials appear to have some dependance on thickness, with thinner materials producing tmore aerosols. The results of the laboratory cutting tests show that most measured particle size distributions are bimodal with one mode at about 0.2 μm and the other at about 10 μm. The average Mass Median Aerodynamic Diameters (MMAD's) for these tests are 0.36 ±0.08 μm for stainless steel, 0.48 ±0.17μm for aluminum and 0.52±0.12 μm for carbon steel

  19. 46 CFR 98.25-55 - Cargo piping.

    Science.gov (United States)

    2010-10-01

    ... piping by means of seamless steel pipe expansion bends. Special consideration will be given for packless... Cargo piping. (a) Piping shall be of seamless steel meeting the requirements of § 56.60-1 of...

  20. Fracture analysis for pressure pipe wrapped with carbon-fiber reinforced composites

    International Nuclear Information System (INIS)

    A coupled FEM/EFG numerical method is introduced to calculate the stress intensity factors (SIF) along the crack front of a cracked pressure pipe line wrapped with carbon-fiber reinforced composite material (CFRC). Two types of crack shape, traverse through-wall crack and surface ellipse crack are considered respectively, based on which the effect of the CFRC sleeve length to the Stress Intensity Factors is numerically investigated. It shows that using the algorithm presented in this paper, the stress intensity factors of 3D component can be calculated effectively, and the SIF of the cracked pressure pipe line repaired with CFRC decrease obviously, compared to the original cracked pipe without any repair. Better repair efficiency is obtained with the increase of the sleeve length, but when the length is increased to a certain value, the length increasing of the sleeve contributes little to the decrease of the SIF, therefore to the repair efficiency. (authors)