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一、前言随着世界能源的日趋紧张,西德已于1974年研制出了微合金化非调质钢。随后,英.法、日、美也相继研制并建立了自己的非调质钢系列。非调质钢是利用微量沉淀硬化型合金元素 V、Nb,Ti 的碳、氮化合物弥散析出来起强化作用的,使其在热锻或轧制后在一定的冷却速度下,达到与碳结构钢调质状态相当的强韧性。机械制造行业大量使用的中碳结构钢零件,一般需经调质处理才能获得所需的综合
I. Preface As the world’s energy becomes more and more tense, West Germany developed the non-quenched and tempered steel in 1974. Subsequently, Britain, France, Japan and the United States have also developed and established their own series of non-quenched and tempered steel. Non-quenched and tempered steel is the use of micro precipitation hardening alloy elements V, Nb, Ti carbon and nitrogen compounds dispersed precipitation play a reinforcing role, so that after the hot forging or rolling at a certain cooling rate, and the carbon structure Steel quenched and tempered state of considerable strength and toughness. Large-scale use of machinery manufacturing industry carbon structural steel parts, generally need to be quenched and tempered in order to obtain the required comprehensive