Slow strain rate (SSR) and C-ring stress corrosion cracking (SCC)
tests have historically been used to screen alloys for sour gas
environments . The relevance of these testing techniques in predicting
actual field corrosion behavior was evaluated for age-hardenable nickel base alloy 925 (UNS N09925) and alloy 718 (UNS N07718) . While SSR testing provides an acceptable accelerated screening tool for ranking alloys in sour oil field environments, C-ring SCC testing ranks alloys higher in sour environments than SSR testing.
Keywords: slow strain rate, C-ring, testing, technique, evaluation,
UNS N09925, UNS N07718, high strength, corrosion resistant alloy, oil
patch, applications, sour service.