The effect of bar defects on the stress corrosion cracking sensitivity of sulfide in L360 pipeline steel girth weld under H2S environ-ment was studied by anti-sulfide stress corrosion experiment,slow strain rate tensile experiment and hydrogen content test.The results show that cracks appear in the heat-affected zone of the girth weld at the stress levels of 72%,85%and 110%SMYS,and the crack length increases with the increase of the loading stress.The bar defected girth weld specimen breaks rapidly after the yield point,and its fracture strain(0.024)is only 21.05%of the non-defective girth weld specimen.The presence of bar defects promotes the aggregation of hydrogen ions at the crack tip,thereby aggravating the cracking tendency.The hydrogen elimination treatment can effectively reduce the hy-drogen content and reduce the sensitivity of the girth weld to sulfur stress corrosion and cracking.
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维普
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