Mainly used for nitriding of products, so that the surface of the nitriding workpiece can obtain a nitrogenous hardening layer with high hardness, high wear resistance, high fatigue limit and good wear resistance. Low alloy carbon steel, die steel, stainless steel, casting, bearing steel and powder treated gold can all be nitrided. The depth of the white bright layer is up to 20um. The main characteristics of nitriding are: small deformation of the workpiece, significantly improve the various performance of the workpiece, such as fatigue strength, wear resistance and corrosion resistance, etc., and the nitriding layer has a certain degree of toughness and it is not easy to flake.