Sirius 309 is a high-temperature stainless steel containing 23% Cr and 13% Ni. The alloy is a multipurpose high-temperature alloy. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: SS-941. Producer or source: Industeel USA, LLC.