Bethlehem M-1 is a high-molybdenum, low-tungsten type of high-speed tool steel. It has good cutting ability except for heavy-duty, continuous cutting operations where the ultimate in red-hardness is required. 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-289. Producer or source: Bethlehem Steel Corporation.