Die die steel is used to create, mold and other mold molding hot forging steel. Mold is a machinery manufacturing, radio instruments, electrical appliances and other industrial sectors in the manufacturing part of the main processing tool. A direct impact on the quality of mold pressure processing quality, the accuracy of product yield and production costs, and die by the quality and life of a reasonable addition to the structural design and accuracy of processing, mainly by the impact of mold materials and heat treatment.