120t BOF-LF-CC板坯-8 mm板流程Nb-Ti微合金化大梁钢750L的开发与实践  

Development and Practice of Nb-Ti Microalloying 750L Beam Steel by 120t BOF-LF-CC Slab-8 mm Plate Flowsheet

作　　者：徐正彪 王延苹 刘启森[1] 徐剑[1] 林承江 秦哲 Xu Zhengbiao;Wang Yanping;Liu Qisen;Xu Jian;Lin Chengjiang;Qin Zhe(Iron and Steel Research and Development Department;Metallurgical Technology Department,Rizhao Steel Holding Group Co Ltd,Rizhao 276800)

机构地区：[1]日照钢铁控股集团有限公司钢铁研究发展处 [2]日照钢铁控股集团有限公司冶金技术处,日照276800

出　　处：《特殊钢》2021年第6期43-46,共4页Special Steel

摘　　要：采用120 t BOF-LF-连铸-控轧控冷工艺流程,开发出8 mm高强度汽车大梁钢750L(R_(m)≥750 MPa)。结果表明,通过750L钢Nb-Ti复合微合金化(/%:0.074C,0.11Si,1.51Mn,0.020P,0.002S,0.042Als,0.033Nb,0.109Ti),结合控轧控冷技术(精轧区压下量≥40%),生产的750L钢带的抗拉强度782~810 MPa,伸长率≥17.5%,晶粒度11.5~12.5级,冲击功≥90 J,各项技术指标满足并优于标准的要求。By 120 t converter-LF refining-continuous casting-controlled rolling and cooling process,the 750L(R_(m)≥750 MPa)beam steel of 8 mm high strength automobile is succes fully developed.The results show that through 750L steel Nb-Ti composite microalloying(/%:0.074C,0.11Si,1.51Mn,0.020P,0.002S,0.042Als,0.033Nb,0.109Ti),combined with control rolling and cooling(finish rolling reduction≥40%),that of produced 750L steel strip,the tensile strength 782~810 MPa,elongation≥17.5%,grain size 1.15~12.5 rating and impact energy≥90 J,all technical indexes satisfy the requirements of standard.

关 键 词：Nb-Ti微合金化 控制轧制 控制冷却 大梁钢750L 

分 类 号：TF76[冶金工程—钢铁冶金] TG335[金属学及工艺—金属压力加工]