Relationship between hydrogen-induced cracking and type I sulfide stress cracking of high-strength linepipe steel

Hydrogen-induced cracking (HIC) resistance of high-strength linepipe steel was investigated using the cathodic hydrogen charging method. Sulfide stress cracking (SSC) resistance was also evaluated using a dead weight device. This study clearly proves that HIC occurs as an initial crack of type I SSC, which is the same as a hydrogen-induced blister crack (HIBC), and thus the initial crack behavior of HIBC as a precursor to type I SSC can be evaluated by the cathodic hydrogen charging method.