Systematic Investigation Of The Role Of Stress-Induced Pits And Grooves In SSC Four-Point Bend Testing Of Line Pipe Steel
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Product Number:
51320-14446-SG
Author:
Xin Yue, Weiji Huang, Andrew J. Wasson, Jamey A. Fenske, Timothy D. Anderson, Brian D. Newbury, Doug P. Fairchild
Publication Date:
2020
$20.00
Steel pipelines are sometimes subjected to demanding sour environments resulting from the presence of high H2S contents. Pipeline materials, therefore, must be resilient against sulfide stress cracking (SSC) which is caused by H2S. Beginning in the 1980s, thermo-mechanically controlled processed (TMCP) steels have been widely used for the manufacturing of large-diameter sour service pipelines. The failure of the Kashagan pipelines in 2013 raised concern regarding the use of TMCP steels in sour environments. These concerns arise from the potential for local hard zones (LHZs) to be produced on the surface of the line pipe during TMCP processes, ultimately leading to through-wall SSC failures. In the present study, several X60 - X65 TMCP steels (both with and without LHZs) have been tested under different Region 3 (R3) conditions in the NACE MR0175/ISO15156-2 pH-H2S partial pressure diagram. It can be concluded that the presence of LHZs increases TMCP steels’ sour cracking susceptibility; however, TMCP steels without LHZs pass the SSC tests at even the most severe R3 environments. Traditional HRC or HV10 testing are not able to detect LHZs, and so lower load HV 0.5 or HV 0.1 tests are necessary. For TMCP steels, the current R3 may be further divided into R3-a and R3-b sub-regions. The sour cracking severity of R3-a is less than that of R3-b. Additional actions, like enhanced mill qualification of the TMCP plate, should be considered to ensure that no LHZs exist in steels to be utilized in R3-b environments.
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Product Number:
51300-08496-SG
ISBN:
08495 2008 CP
Author:
Wan Keun Kim, Kyoo Young Kim, Tae Won Yun, and Boo Young Yang
Publication Date:
2008
$20.00
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Product Number:
51300-97057-SG
ISBN:
97057 1997 CP
Author:
M.S. Cayard, R.D. Kane
$20.00
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