CRUCIBLE 303 SUPER-X is a non-hardenable austenitic stainless steel with improved machinability and non-galling characteristics. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-490. Producer or source: Crucible Specialty Metals Division, Colt Industries.