Core H 13 is a common material and widely used. Our aluminum molds basically use 8407. Of course, this is not absolute. The life of die-casting die depends largely on the heat treatment process. Strict and reasonable heat treatment process can greatly improve the life of the die. When the processing conditions permit, the processing of the core is usually: quenching and tempering-rough machining-quenching treatment +2 or 3 tempering-final forming finishing-stress relieving treatment and nitriding. . . .