一、概述 许多机械零件,常采用含碳量为0.40～0.50％的碳素钢或低合金钢制造,并经调质(淬火+回火)处理来达到所要求的机械性能。为了省去调质处理,以节约能源,最近几年来(特别是1979年以后),国外已研制出了一种新型结构钢——非调质钢,它是现代材料技术发展的最新成果,是在中碳钢内加入微量V、Ti、Nb、N等特殊元素进行微合金化,于轧制或锻造后的空冷状态下, First, an overview Many mechanical parts, often with carbon content of 0.40 to 0.50% of carbon steel or low alloy steel, and quenched (quenching + tempering) to achieve the required mechanical properties. In order to save the quenching and tempering, in order to save energy, in recent years (especially after 1979), abroad has developed a new type of structural steel - non-quenched and tempered steel, which is the latest achievement in the development of modern materials technology, is In the medium-carbon steel by adding a trace amount of V, Ti, Nb, N and other special elements for micro-alloying, in the air-cooled state after rolling or forging,