As the heart component of the internal combustion engine, the piston ring bears high temperature, high pressure, and corrosion under the harsh internal working environment of the engine, and plays a role of sealing, supporting, lubricating, and conducting heat. The piston ring industry is a technology-intensive and labor-intensive industry that requires large investment. It is closely related to the development of modern internal combustion engines and the automobile industry. Due to the development of vehicle engines in the direction of high strengthening, high output power and light weight, the piston ring becomes thinner and lighter, which requires the plug ring to have high strength. The steel plug ring used in gasoline engines in the past is gradually introduced In the field of diesel engines, some diesel engines began to use steel oil rings. Compared with cast iron rings, steel plug rings require no casting process, are light in weight, and have simple processing methods. Domestic mainstream manufacturers have invested in the development and production of new steel rings. The proportion of steel rings used in the automotive diesel engine industry is also very high. 　　 

Nowadays, various quality cast iron materials and steel are used for piston rings. First of all, the cast iron material is investigated. According to the bearing capacity characterized by material strength, elongation, fatigue strength and wear resistance, a kind of ductile iron with high bending strength and elastic modulus should be particularly preferred for a compression ring. The matrix is martensite to obtain high hardness, which can make the side surface have better wear resistance. The plug ring can be used as a non-plated ring, and a material with a refined lamellar structure casting quality in the quenched and tempered heat treatment state has been developed, through the formation of special carbides of chromium, vanadium, manganese and tungsten, and a martensite matrix structure , To obtain good wear resistance.