The Effect of Metallurgical Factors on SOHIC in HIC Free Linepipe Steels

摘要

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.