... and temper: 63-66Characteristic:Tungsten-molybdenum high speed steel developed by China, high performance in toughness , ,hardness, high temperature hardness.Application: Can be ... of high capacity cutting tools to bear impact force ,such as gear shaper cutter, milling cutter,screw tap,drill bit ... thermoplasticity shaped cutting tools and antiabrasive cutting tools under high load. high speed steel