Abstract Allegheny Ludlum 602 is a manganese, silico-molybdenum type, shock resisting tool steel recommended for applications where extreme toughness is required along with hardness and wear resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-153. Producer or source: Allegheny Ludlum Corporation.