Die on the job in addition to the substrate with a high enough strength and toughness of reasonable match, the surface properties of mould is very important for the performance and service life. Mold surface treatment technology, is through the surface coating, surface modification, or composite processing technology, mould surface morphology, chemical composition, structure and stress state, in order to obtain the required surface performance of the system engineering. At present is mainly in mould manufacturing is widely applied nitriding and carburizing and hardening film deposition.

Because of nitriding technology can form the surface of the excellent properties, and nitriding process with steel quenching process has the good coordination, nitriding temperature is low, at the same time without fierce cooling after nitriding, the mould deformation, therefore the mold surface strengthening is earlier by nitriding technology, is also the most widely used.

Die carburizing is in order to improve the overall strength of mould toughness, namely mould work surface with high strength and abrasion resistance. Hardening film deposition technology is now more mature of CVD and PVD. Die since the 80 s using coated membrane technology. Under the condition of current technology, hardening film deposition techniques (mainly is the cost of the equipment) is higher, is only applied on some precision, long life molds, if adopt the way of setting up heat treatment center, the coating will greatly reduce the cost of hardening membrane, more die if using this technique, can improve the standard of mould manufacturing as a whole.