改善Q420B铁塔角钢缺陷的冶炼制备工艺研究  

Research on Process Practice for Improving Defects of Q420B Tower Angle Steel

作　　者：兴超 张利武 XING Chao;ZHANG Liwu(Department of Metallurgy and Chemical Engineering,Jiyuan Vocational and Technical College,Jiyuan Henan 459000,China;Steel Making Plant of Shiheng Special Steel Group Co.Ltd.,Feicheng Shandong 271600,China)

机构地区：[1]济源职业技术学院冶金化工系,河南济源459000 [2]石横特钢集团有限公司炼钢厂,山东肥城271600

出　　处：《重庆科技学院学报（自然科学版）》2021年第2期117-120,124,共5页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

摘　　要：通过扫描电镜和能谱分析,对Q420B铁塔角钢成品中出现的裂纹和表面凹坑缺陷进行研究。研究发现,此类缺陷与钢中含有的夹杂物有关,以硅酸盐类夹杂物为主。钢中的硅酸盐夹杂物,主要是由于浇注过程中液面波动导致保护渣卷入钢中而产生。为了改善角钢的裂纹和表面凹坑缺陷,提出优化措施:将保护渣黏度由0.626 Pa·s降低至0.450 Pa·s,加入Nb、Ti合金,并将浸入式水口插入深度控制在100~130 mm。The cracks and surface pits in Q420B tower angle steel products are studied through SEM and EDS analysis.The results show that the inclusions are mainly silicate inclusions,which are mainly caused by the inclusion of mold powder into steel due to the fluctuation of liquid level during pouring.In order to improve the cracks and surface pits of angle steel,the viscosity of mold powder is reduced from 0.626-0.450 Pa·s;Nb and Ti alloy are added and the insertion depth of the submerged nozzle is controlled at about 100-130 mm.

关 键 词：Q420B铁塔角钢 缺陷 冶炼工艺 

分 类 号：TF762[冶金工程—钢铁冶金]