铌微合金化HRB400E钢铸坯裂纹研究与控制  

Study and practice of BOF less-slag steelmaking technology with high-titanium hot metal

作　　者：华福波 王劼[1] 周玉杭 魏福龙[1] 谢祥[1] Hua Fubo;Wang Jie;Zhou Yuhang;Wei Fulong;Xie Xiang(Shougang Shuicheng Iron&Steel(Group)Co.,Ltd.,Liupanshui 553028,China)

机构地区：[1]首钢水城钢铁集团公司,贵州六盘水553028

出　　处：《冶金标准化与质量》2024年第2期45-48,共4页Metallurgical Standardization & Quality

摘　　要：铌是热轧带肋钢筋常用微合金化元素,具有细化奥氏体晶粒、沉淀硬化作用,且与钒相比价格较低具有较好的性价比。但因其元素特性,在铸坯冷却过程中易形成贯穿性裂纹,轧制时钢材开裂而导致堆钢。本文通过研究铌微合金化铸坯裂纹形成机理,采取优化钢水成分、低过热度浇注、二次冷却工艺优化等措施,有效解决了铸坯裂纹问题,轧制过程因铸坯裂纹导致的万吨堆钢率由1.32支降低至0.04支。Niobium is a commonly used microalloying element for hot-rolled ridged steel bars,which has the effect of refining austenite grains and precipitation hardening.Compared with vanadium,niobium has a lower price and a better cost performance.However,due to its element characteristics,it is easy to form penetrating cracks in the cooling process of the billet,and the steel cracking during rolling leads to the piling-up of steel.In this paper,the crack formation mechanism of niobium microalloying casting billet is studied,and the crack problem of casting billet is effectively solved due to the results of optimizing the composition of molten steel,low superheat casting,secondary cooling process optimization,etc.The rate of 10 thousand tons of pile steel caused by the crack of casting billet is reduced from 1.32 to 0.

关 键 词：铌微合金化 裂纹 机理 堆钢 

分 类 号：TF704[冶金工程—钢铁冶金]