锻压技术

高层建筑用低Mo耐火钢的开发与性能研究

英文标题：Development and property study of low Mo refractory steel for high-rise building

作者：耿城马尤苏夫董瑞华

单位：1.信阳农林学院规划与设计学院 2. 西安科技大学建筑与土木工程学院 3.北京科技大学材料科学与工程学院

分类号：TG142.1

出版年,卷(期):页码：2022,47(9):238-244

摘要：

为了提升低Mo耐火钢的综合性能，研究了合金化元素含量和冷却方式对低Mo耐火钢显微组织和力学性能的影响。结果表明：所开发的低Mo型M2耐火钢以及低Mo+低（Nb+V+Ti）型X1-H和X2-H耐火钢具有较高的强塑性、低屈强比以及良好的耐火性能（600 ℃下屈服强度与室温屈服强度的比值大于2/3）；空冷态耐火钢的组织为铁素体+珠光体+少量贝氏体，水冷态耐火钢的组织为贝氏体+铁素体；空冷态M1、M2和X1钢的贝氏体的体积分数小于水冷态X1-H和X2-H钢，而空冷态耐火钢的铁素体的晶粒尺寸明显高于水冷态耐火钢。微量（Nb+V+Ti）的添加可以起到第二相强化和贝氏体相变强化作用，可以有效弥补Mo对耐火钢的高温强化作用。最终确定终轧温度为885 ℃、冷却方式为水冷的X2-H钢具有最佳的综合性能。

In order to improve the comprehensive properties of low Mo refractory steel, the effects of alloying element content and cooling method on the microstructure and mechanical properties for low Mo refractory steel were studied. The results show that M2 refractory steel with low Mo, X1-H and X2-H refractory steels with low Mo+low （Nb+V+Ti） have high strength-plasticity, low yield ratio and good refractory properties (the ratio of yield strength at 600 ℃ to yield strength at room temperature is more than 2/3). The microstructure of air-cooled refractory steel is ferrite, pearlite and a small amount of bainite, and the microstructure of water-cooled refractory steel is bainite and ferrite. The volume fractions of bainite in air-cooled M1,M2 and X1 steels are smaller than that in water-cooled X1-H and X2-H steels, while the ferrite grain size of air-cooled refractory steel is significantly higher than that of water-cooled refractory steel. The addition of trace (Nb+V+Ti) can play the roles of the second phase strengthening and the bainite transformation strengthening, which can effectively compensate for the high temperature strengthening effect of Mo on the refractory steel. Finally, it is determined that when the final rolling temperature is 885 ℃ and the cooling mode is water-cooling, the X2-H steel has the best comprehensive performance.

基金项目：

国家自然科学基金资助项目（51708448）

耿城（1979-），男，硕士，副教授 E-mail：llrgch929@163.com

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