21-4N valve steel
21-N steel is an austenitic heat-resistant steel used for automobile engine exhaust valves. This steel is mainly hardened by carbon and nitride precipitation. It has high strength, toughness and wear resistance at an operating temperature of 700 degrees. It also has structural stability and oxidation resistance under hot and cold alternation. It is widely used in the manufacture of exhaust valves.
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Product Introduction
53Cr21Mn9Ni4N, referred to as 21-4N, is the main steel grade currently used in the manufacture of engine valves in countries around the world. It is based on austenite with carbon and nitrogen compounds dispersed as precipitation hardening phases to obtain sufficient high-temperature strength, toughness, hardness, wear resistance, as well as structural stability under hot and cold alternating conditions, oxidation resistance, and resistance to lead oxide corrosion.