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微合金化钢是在C-Mn钢或低合金钢中添加微量元素(<0.1%的Nb、V、Ti,有时还包括B、Al、RE)进行合金化,通过高纯洁度冶炼,控轧(锻)控冷(TMCP),获得细晶、碳氮化物沉淀强化的高强度、高韧性,高可焊性、良好成形性的钢种。这类钢的品种、产量和应用领域正在不断扩大,是钢铁行业发展方向之一。其具有显著高的使用性能和性价比及某些特殊的性能。微合金元素的主要作用:Nb使用普遍,有利于TMCP工艺。能延迟再结晶、降低奥氏体-铁素体转变温度。能与其它微合金元
Microalloyed steels are alloyed with trace elements (<0.1% Nb, V, Ti, and sometimes B, Al, RE) in C-Mn steels or low-alloy steels. (Forged) controlled cooling (TMCP), access to fine grain, carbonitride precipitation enhanced high strength, high toughness, high weldability, good formability of the steel. This type of steel varieties, production and application areas are constantly expanding, is one of the development direction of the steel industry. It has significantly higher performance and cost performance and some special properties. The main role of microalloying elements: Nb universal, is conducive to TMCP process. Can delay recrystallization, reducing austenite - ferrite transformation temperature. With other micro-alloy yuan