Mainly including spraying powder and tungsten carbide and chromium carbide based thermal spraying powder spraying powder gol-egret, the WC spraying powder coating has high hardness, good wear resistance, adhesive wear resistance,corrosion resistance and high bonding strength. Mainly used in petrochemical valves, geological mining tools, injection screws, printing machinery parts. Chromium carbide based spraying powder than WC spraying powder coating has higher thermal stability, the use of high temperature to 850 DEG C, and the coating has good resistance to corrosion and oxidation resistance. It is mainly used in the high temperature corrosive environment such as the inner wall of gas pipeline and the inner wall of pump body.