ALLOY X-40 is a cobalt-base high temperature alloy having high tensile and creep properties in precision-castings. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-10. Producer or source: General Electric Company. Originally published December 1956, revised June 1963.