控轧控冷工艺对高强低屈强比建筑用钢组织性能的影响  

Effect of controlled rolling and controlled cooling process on microstructure and properties of high strength and low yield ratio building steel

作　　者：张涛 潘丽芳 赵金华[1] 张红旭 薛小飞 刘光明[1] ZHANG Tao;PAN Lifang;ZHAO Jinhua;ZHANG Hongxu;XUE Xiaofei;LIU Guangming(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Jianbang Group Co.,Ltd.,Linfen 043000,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]山西建邦集团有限公司,山西临汾043000

出　　处：《轧钢》2024年第6期17-24,共8页Steel Rolling

基　　金：山西省选派留学回国人员科技活动基金项目(20210046);山西省留学基金资助研究项目(20230007);山西省科研创新项目(2023KY633)。

摘　　要：针对高强抗震建筑用钢如何实现高屈服强度及低屈强比耦合匹配的关键问题,基于自主设计的化学成分,采用控轧控冷工艺对试验钢组织性能进行了探究。结果表明:在“两阶段控轧+水冷(终冷温度660℃)”的工艺条件下,试验钢微观组织为铁素体、珠光体及贝氏体构成的复相组织,实现了强度、塑性及低屈强比的良好匹配,平均屈服强度约为660.0 MPa,平均抗拉强度达到约1 196.7 MPa,平均断后伸长率约为14.8%,平均屈强比低至0.55。试验钢中Mn、Si元素的固溶强化,以及贝氏体和珠光体组织产生的细晶强化及位错强化是获得高强度低屈强比的主要机制。Aiming at the key problem of how to realize the coupling matching of high yield strength and low yield ratio for high strength seismic building steel,based on the self-designed chemical composition,the microstructure and properties of the test steel were investigated by controlled rolling and controlled cooling process.The results show that under the process conditions of'two-stage controlled rolling+water cooling(final cooling temperature 660℃)',the microstructure of the test steel is a multiphase structure composed of ferrite,pearlite and bainite,which realizes a good match of strength,plasticity and low yield ratio.The average yield strength is about 660.0 MPa,the average tensile strength is about 1196.7 MPa,the average elongation after fracture is about 14.8%,and the average yield ratio is as low as 0.55.The solid solution strengthening of Mn and Si elements in the test steel,as well as the fine grain strengthening and dislocation strengthening caused by bainite and pearlite structures are the main mechanisms for obtaining high strength and low yield ratio.

关 键 词：建筑用钢 高强度 低屈强比 控轧控冷工艺 复相组织 

分 类 号：TG1[金属学及工艺—金属学]