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在曲轴制造中,西德等国已采用微合金曲轴钢取代通常的碳钢,通过对终锻后的冷却温度进行控制以满足性能要求,这样,锻后不需淬火和回火,可以有效地降低成本。用作曲轴材料的典型微合金钢是49MnVS3(其中,C-0.44～0.54％,Si-0.30～0.60％,Mn-0.60～1.00％,S-0.045～0.065,V-0.08～0.13％),化学成份同SAE1046相近。微合金钢的抗拉强度为800～1000MPa,屈服强度为500～650MPa,延伸率不低于11％,断面收缩率不低于30％。在这种钢中含有微量的钒和铌,由于碳氮化合物在高温度条件下冷却时发生弥散硬化,对位错的发展起了限制作用,这样,钢的
In the manufacture of crankshafts, West Germany and other countries have replaced the usual carbon steel with micro-alloyed crankshaft steel to meet the performance requirements by controlling the cooling temperature after the final forging, so that quenching and tempering without forging can be effective cut costs. Typical microalloyed steels used as crankshaft materials are 49MnVS3 (C-0.44 to 0.54%, Si-0.30 to 0.60%, Mn-0.60 to 1.00%, S-0.045 to 0.065, V-0.08 to 0.13% Composition and SAE1046 similar. Micro-alloy steel tensile strength of 800 ~ 1000MPa, yield strength of 500 ~ 650MPa, elongation of not less than 11%, reduction of area of not less than 30%. In this steel containing trace amounts of vanadium and niobium, due to the carbonitride cooling under high temperature conditions when the dispersion hardening, the development of dislocation has played a limiting role, so that the steel