Quantitative Study for Sulfide Stress Corrosion Cracking of Tubular Steel

Abstract

Threshold stress in constant load tests and critical stress in constant strain tests for sulfide stress corrosion cracking (SCC) of seven tubular steels were measured. Percent reduction in area loss caused by SCC of four tubular steels also were measured. Results showed there was no interrelationship among the three parameters for sulfide SCC. The threshold stress for hydrogen-induced delayed failure during charging in the sulfuric acid (H2SO4) solution in the constant load test decreased linearly with the logarithm of the concentration of diffusible hydrogen for four tubular steels. Threshold stresses obtained during dynamic charging with the current corresponding to the diffusible hydrogen concentration during immersing in hydrogen sulfide (H2S) solution were consistent with the threshold stresses for sulfide SCC. Therefore, the threshold stress for sulfide SCC can be measured using dynamic charging in the H2SO4 solution.