HAYNES STELLITE Star J-Metal is a cobalt-base alloy recommended for handling extreme conditions of wear, abrasion and heat. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-31. Producer or source: Haynes Stellite Company.