In recent years, some new plastic mold steels have been widely used in China, such as P20, 3Gr2Mo, PMS, SMI, SMII, etc., which have a direct and significant impact on the quality and service life of the mold, but the overall usage is still small. Plastic mold standard mold bases, standard push rods and springs have been widely used, and some domestically produced hot runner system components have appeared.