Sumitomo SM2550-125 is a high strength nickel alloy for use in oil country tubular goods as a material suitable for severe sour service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming and heat treating. Filing Code: Ni-735. Producer or source: Nippon Steel and Sumitomo Metal Corporation.