ELECTRITE CO-6 is a high-speed steel of the 6 molybdenum-6 tungsten type to which 9% cobalt has been added. This cobalt addition increases the red hardness and permits a retention of greater cutting hardness at elevated temperatures. It is designated as SAE-M36 and AISI Type M36. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-35. Producer or source: Latrobe Steel Company. Originally published July 1955, revised June 1963.