前言由于发动机功率与转速的提高,排气阀工作温度也随之上升到700—750℃左右,个别的接近800℃。排气阀用钢应具备下列条件: 1.耐燃烧气氛的腐蚀,特别是对汽油中四乙基铅抗爆剂的腐蚀; 2.抵抗燃烧产物所含质点的侵蚀和腐蚀; 3.在高温下保持高的机械强度; Preface As the engine power and speed increased, the exhaust valve temperature also will rise to about 700-750 ℃, individual close to 800 ℃. Exhaust valve steel should meet the following conditions: 1. Burning resistance to corrosion of the atmosphere, especially gasoline in tetraethyl lead antiknock corrosion; 2. Resistance to combustion products containing particles erosion and corrosion; 3. At high temperatures Maintain high mechanical strength;