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一般发动机的排气门是在高温下(600—800℃)工作,并且承受着重复的冲击,因此制造的材料必须具有强的韧性、耐热性、抗腐蚀性、受热时的刚性、耐磨性,以及导热性、加工性等性能。具有这些性能的钢材有钨铬钢、镍铬钢、铬钢、矽铬钢等几种,而用得比较多的是矽铬钢。对于进气门,因为它的工作温度比较低,一股用铬钢和镍铬钢。
Exhaust valves for general engines operate at high temperatures (600-800 ° C) and are subject to repeated impacts so that the material produced must have strong toughness, heat resistance, corrosion resistance, rigidity when heated, wear resistance As well as thermal conductivity, processability and other properties. Steel with these properties are tungsten chrome steel, nickel-chromium steel, chrome steel, silicon chrome steel, etc., and more used in the chrome-chrome steel. For the intake valve, because of its relatively low operating temperature, with a chrome steel and nickel-chromium steel.