Morphology of localized attack on the tension side of 3 1/2% Ni U-bend specimen in 0.5% acetic acid saturated with H22S at 0.1 MPa, balance N2 (PT = 1 atm). Magnification 200X.The depth of the pit before cracking was about 200 μm.
Dunlop, A. K. Stress corrosion cracking of low strength, low alloy nickel steels in sulfide environments. Corrosion 34, 88-96 (1978).