DOUBLE SIX M-2 is a tungsten-molybdenum high-speed steel with a well-balanced composition suitable for a wide variety of applications. It has replaced 18-4-1 type in many applications because of its superior properties and relative economy. This datasheet provides information on composition, physical properties, and hardness as well as fracture toughness. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-459. Producer or source: Latrobe Steel Company.