低碳钢或低碳合金钢,经淬火和低温回火处理获得马氏体组织后,不但强度有很大提高,其韧性和塑性指标与许多中碳合金钢调质处理后的指标相当,而且,还具有更低的缺口敏感性。因而,它可以部分替代中碳合金钢调质处理。文中介绍了三种低碳马氏体钢的成分、热处理工艺、力学性能及其在汽车起重机上的应用实例。 Low-carbon steel or low-carbon alloy steel, after quenching and low temperature tempering martensite, not only has a great increase in strength, toughness and plasticity indicators and many medium-carbon alloy quenched and tempered indicators, and , But also have a lower gap sensitivity. Therefore, it can partially replace the carbon steel quenched and tempered. In this paper, the composition, heat treatment process, mechanical properties and application examples of three low carbon martensitic steels are introduced.