The purpose of this study is to evaluate the effect of metallurgical factors on SOHIC of two HIC free linepipe steels in a sour environment. HIC, SSC and SOHIC tests of two steels were performed in reference to NACE TM0284, 0177 and 0103 standard test methods, respectively. Results showed that ferrite-acicular ferrite microstructure is more resistant to SSC and SOHIC than ferrite-pearlite. Inclusions in two steels acted as crack nucleation sites. In the point of view of crack propagation, SOHIC characteristics of two steels were consistent with SSC test results.
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