COBALTCROM is a cobalt, high-carbon, high-chromium tool and die steel. It is air-hardening and non-deforming. It is also known as PRK-33 COBALTCROM. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-12. Producer or source: Darwin's Ltd. Originally published November 1953, revised February 1965.