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Effect of Surface Hardness and Hydrogen Sulfide Partial Pressure on Sulfide Stress Cracking Behavior in Low Alloy Linepipe Steel
Tetsu to hagane
TMCP (thermo-mechanical controlled process) linepipes have been long used for severe sour environment, but recently sulfide stress cracking (SSC) caused by local hard zones has become a concern. In order to clarify the hardness threshold that leads to SSC, four-point bend (4PB) SSC tests as per NACE TM0316 were conducted under several H 2 S partial pressure conditions. For 1 bar and higher H 2 S partial pressure conditions, the surface hardness threshold (at 0.25 mm from surface) observing 4PBdoi:10.2355/tetsutohagane.tetsu-2020-121 fatcat:3gwmaijwvjge5kc5lmfih32iua