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

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... p 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.