Limited corrosion data exists on the effect of grain size on the stress corrosion cracking (SCC) resistance of Oil Country Tubular Goods (OCTG) to sour gas environments. Among the primary Corrosion
Resistant Alloys (CRA’s) currently used in the cold worked condition for OCTG in sour gas wells is alloy G-3 (UNS N06985). Slow strain rate (SSR) tests conducted in a severe sour brine environment representative of Mobile Bay type conditions showed that the grain size of alloy G-3 OCTG has no discemable effect on stress corrosion cracking resistance. Also, no effect of grain size on intergranular attack (IGA) susceptibility was
observed in the Streicher Test, ASTM Standard Test Method G28A.
Keywords: slow strain rate, intergranular attack, testing, evaluation, grain size, UNS N06985, corrosion resistant alloy, nickel, oil patch, application, tubing, sour service.