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Martensitic stainless steels for OCTG materials are widely used in sweet and mild sour conditions. Environmentally-assisted cracking (EAC) is a major corrosion-related issue when using stainless steels as OCTG materials. The EAC in specific oil/gas well conditions with sour environments is defined as sulfide stress cracking (SSC) and stress corrosion cracking (SCC). The SSC is a type of cracking caused by hydrogen embrittlement, which is attributed to a cathodic reaction under acidic conditions, while SCC is associated with an anodic reaction. SSC testing for martensitic stainless steels for OCTG material is often carried out at or near ambient temperature under conditions simulating condensed water, and SCC tests are conducted at higher temperatures under conditions simulating formation water and/or the brine availability test.
Environmentally-assisted cracking (EAC) of nickel-base alloys has been observed in the primary coolant of light water reactors (LWRs). One of the main issues is primary water stress corrosion cracking (PWSCC) of Alloy 182 which has been a concern for a long time. For assumed or existing defects, disposition curves (crack growth rate as function of stress intensity factor) are available.