Die steel is the steel used to manufacture molds such as cold forming molds, hot forming molds and injection molds. Mold material is the logistical basis of mold manufacturing, of which the traditional mold material is cast steel, whose varieties, specifications and quality play a decisive role in the performance, service life and cycle of mold manufacturing. In recent years, domestic and foreign casting steel productivity, production technology, processing equipment, quality and variety have made rapid development, Fushun special steel, Great Wall special steel, Xingcheng special steel, Hang Steel, etc. have also emerged. In a group of high-quality manufacturing enterprises in China, the development of steel for casting has also promoted the development of industrial products in the direction of advanced, customized and high value-added. There is a wide range of moulds, and a wide range of materials used to make moulds, the most widely used forming material is cast steel.