HAYNES STELLITE Alloy No. 31 is a cobalt-base, high-temperature alloy having high tensile and creep properties in precision castings. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as machining and joining. Filing Code: Co-8. Producer or source: Haynes Stellite Company. Originally published January 1956, revised November 1960.