SUPER-MOTUNG, a molybdenum type of high-speed steel containing cobalt, possesses a combination of cutting and toughness properties superior to many grades of high-speed steels. This datasheet provides information on composition and hardness as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-9. Producer or source: Cyclops Corporation. Originally published July 1953, revised February 1960.