The quality and performance of mould materials are important factors affecting the quality, life and cost of mould. In recent years, apart from a variety of high toughness and high wear resistance cold work die steel, flame quenching cold work die steel, cold work die steel metallurgical powder launch, choose cast iron materials in large and medium-sized stamping die abroad, is a notable trend of development. Strong ductile cast iron has good toughness and wear resistance, its welding properties, machinability, surface quenching performance is better, and cheaper than low alloy cast iron, so the application in automobile stamping die is more.