Stress corrosion cracking behavior of TP95S tube steel in an acidic gas field environment

Stress corrosion cracking (SCC) of TP95S tube steel was investigated through electrochemical measurement and electrochemical hydrogen charging, as well as immersion corrosion and slow strain rate tensile tests. The SCC mechanism of TP95S steel in the acidic gas field solution is mixed controlled by anodic dissolution (AD) and hydrogen embrittlement (HE). The SCC susceptibility of TP95S is lower at 100 °C than that at 60 °C because of abated HE. When the tensile stress reaches more than 70% of the yield strength of TP95S tube steel, TP95S exhibits SCC. Thus, stress applied to TP95S tube steel in service should be lower than 70% and 50% of the yield strength at 100 °C and 60 °C, respectively. Furthermore, tensile stress decreases the service life of TP95S tube steel in the acidic gas field.