Valves and valve seats are one of the key components that affect engine reliability and safety. They are mainly used to start and shut down the intake and exhaust passages during engine operation, to control the intake of fuel mixture or air and the discharge of exhaust gases. The working environment of the valve and valve seat is very harsh. In addition to the corrosion of high temperature gas, it also bears the impact of the burst pressure in the cylinder. The main failure mode is wear.