NSSC FW1 is one of the first ferritic stainless steels to have tin (Sn) added as a specific alloying element and is one alloy of an FW series. 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 joining. Filing Code: SS-1111. Producer or source: Nippon Steel & Sumikin Stainless Steel Corporation.