2015•Cailiao gongchengOpen access

Stress Corrosion Cracking Behavior of X80 Pipeline Steel with Design Factor of 0.8 in Near-neutral pH Value Solutions

Yang Dong-pin

Abstract

Stress corrosion cracking(SCC)behavior and sensitivity of X80 pipeline steel and weld joint in NS4 solutions were investigated using slow strain rate tension(SSRT)test.The results show that X80 pipeline steel and weld joint appear mainly plastic damage.The plastic damage of weld joint is higher than that of base metal.The fracture mode of X80 pipeline steel and weld joint exhibits typical ductile fracture in the air,and the transgranular SCC in NS4 solution.Both base metal and weld joint fracture's middle areas of X80 pipeline steel exhibit more obvious brittle fracture feature than that of the edge area in NS4 solutions.The corrosion mechanism of X80 steel is anodic dissolution(AD)above-749.86 mV,and the mixed mechanism of AD and hydrogen embrittlement(HE)between-749.86--839.19 mV,and HE mechanism below-839.19 mV.

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Key concepts: Materials science, Metallurgy, Stress corrosion cracking, Hydrogen embrittlement, Welding, Joint (building), Base metal, Corrosion