Sulfide stress corrosion cracking (SSCC)
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In a wet H2S environment, the hydrogen atoms generated by corrosion penetrate into the steel and dissolve within its lattice, increasing the steel’s brittleness. Cracking that occurs under external tensile stress or residual stress is known as sulfide stress corrosion cracking. In engineering, the brittle cracking that occurs in steel and alloys under tensile stress in environments subjected to wet H2S and other sulfides is also collectively referred to as sulfide stress corrosion cracking. SSCC usually occurs in medium-to-high strength steels or in areas with higher hardness such as welds and their heat-affected zones. Mechanism of sulfide stress corrosion cracking
Indeed, this corrosion cracking is quite severe; it has occurred several times