SSC initiation and propagation mechanism for low alloy steels, involving the transition from APC to HE. Tensile stress,σ, could be externally applied or a result of residual stresses. Formation of a non-stoichiometric surface film is a prerequisite for pit initiation.
Adapted from: Yamane, Y. et al. Effect of Ni on sulfide stress corrosion cracking in low alloy steels. Corrosion/86 (1987).