The high-carbon, high chromium alloy steel with high hardness and appropriate toughness, and temper hardening effect for a typical wind of hard steel, is the best wear resistance of alloy tool steel. (2) adding molybdenum, vanadium, it is both wear, no deformation, impact resistance and other features. (3) secondary refining, good clean grain fine. This steel is high carbon, high chromium (12%) steel, factory by special heat treatment, machining performance with excellent, the hardenability excellent. High toughness and wear resistance, dimensional change and stability in the heat treatment.