In selecting materials for corrosive sour oil field environments, the materials of choice must be reliable and cost-effective. Materials have to meet criteria for corrosion resistance and mechanical properties in service environments for the required service life. Both age-hardened nickel-base alloys and cold-worked solid solution nickel-base alloys offer many advantages such as high-strength, toughness and excellent corrosion resistance. Alloy 028 (UNS N08028), alloy 825 (UNS N08825), alloy G-3 (UNS N06985), alloy 050 (UNS N06950) and alloy C-276 (UNS N10276) are among the primary solid solution high nickel Corrosion Resistant Alloys (CRA's) currently used in the cold worked condition for Oil Country Tubular Goods (OCTG's) in sour gas wells. The primary CRA machining quality age-hardened bar products used with alloys 028 and 825 OCTG's for wellhead and subsurface completions of gas wells are alloy 925 (UNS N09925) and alloy 718 (UNS N07718).
Keywords: nickel-base alloys, sour environments, corrosion resistance, oil country tubular goods, age-hardened, bar, oil field