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Alloy 725 (UNS N07725) is a highly corrosion resistant alloy capable of being age-hardened to 0.2% yield strengths from 115 to 140 ksi (793 to 965 MPa), while maintaining a high level of ductility and toughness1 . As alloy 725 is an austenitic nickel base alloy which is strengthened by precipitation of a gamma double-prime (y”) during aging, large section sizes can achieve uniform hardening throughout the cross section. The alloy is resistant to pitting and stress corrosion cracking (SCC) in Deep Sour Gas Well environments containing NaCl, H2S and S at temperatures up to about 450” to 500°F (232” to 26O”C), and to sulfide stress cracking (SSC) in the NACE TM-0177 environment. Alloy 725 also exhibits excellent corrosion resistance to other commercially significant environments, such as seawater and mineral acids.

A New Age-Hardenable Corrosion Resistant Alloy for Deep Sour Gas Well Service