In addition to requiring sufficient strength and toughness during operation, the surface properties of high-precision mold components are crucial for their working performance and service life. Casting machinery manufacturers introduce these performance improvements. Relying solely on the improvement and enhancement of the substrate material is very limited and uneconomical. However, through surface treatment technology, it is often possible to achieve twice the result with half the effort, which is also the reason for the rapid development of surface treatment technology.

Mold polishing technology is an important component of mold surface engineering and a crucial post-treatment process in mold manufacturing. Mirror mold materials are not only a matter of chemical composition, but more importantly, during smelting, a series of processes such as vacuum degassing, argon gas protection for ingots, vertical continuous casting and rolling, and flexible forging are required to achieve a series of advantages such as fewer internal defects, fine impurity particle size, high dispersion, fine metal crystal size, and good uniformity in mirror mold steel, in order to meet the requirements of polishing to mirror mold steel.

The surface treatment technology of mold accessories is a systematic engineering process that changes the morphology, chemical composition, microstructure, and stress state of high-precision mold accessories through surface coating, surface modification, or composite treatment techniques to obtain the required surface properties. The nitriding process includes gas nitriding, ion nitriding, liquid nitriding, and other methods. In each nitriding method, there are several nitriding techniques that can adapt to the requirements of different steel grades and workpieces.