含钛铁素体不锈钢连铸过程保护渣性能演变对铸坯质量的影响  

Effect of property evolution of mold slag on slab quality during continuous casting of titanium-containing ferritic stainless steel

作　　者：王伟[1,2] 亓捷[3] 翟俊[1,2] 李欢[1,2] WANG Wei;QI Jie;ZHAI Jun;LI Huan(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan 030003,China;Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,China;School of Metallurgy,Northeastern University,Shenyang 110004,China)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003 [2]山西太钢不锈钢股份有限公司,山西太原030003 [3]东北大学冶金学院,辽宁沈阳110004

出　　处：《炼钢》2021年第5期76-79,84,共5页Steelmaking

摘　　要：结合生产实践,研究了含钛铁素体不锈钢浇铸过程中保护渣的成分及性能演变规律,分析了保护渣性能变化对铸坯质量的影响作用。得到如下结论:在含钛铁素体不锈钢连铸过程中,保护渣中Δw(TiO_(2))为2.3%~11.4%。随着浇铸的进行,熔化温度由初始的1124℃提高至1240℃,黏度升高至0.431 Pa·s。TiO_(2)含量增加是保护渣性能恶化和铸坯表面裂纹缺陷产生的主要原因。通过控制钢中钛铝等易氧化元素含量、提高钢液洁净度、防止二次氧化等措施,在含钛铁素体不锈钢浇铸过程中,保护渣稳定性明显提高,纵裂发生率由1.5%降至0.32%。Combined with production practice,the composition and performance evolution of the mold slag during the casting process of titanium-containing ferritic stainless steel were studied,and the effect of mold slag performance changes on the quality of the casting slab was analyzed.The following conclusions were drawn,in the continuous casting process of titanium-containing ferritic stainless steel,the mass fraction of TiO_(2) in mold slag increased in the range of 2.3%to 11.4%.As the casting progressed,the melting temperature increased from the initial 1124℃to 1240℃,and the viscosity increased to 0.431 Pa·s.The increase of TiO_(2) content was the main reason for the deterioration of mold slag and surface cracking defects of casting slab.Through controlling the content of easily oxidized elements such as titantium and aluminum in steel,improving the cleanliness of molten steel,preventing secondary oxidation,etc.,the stability of mold slag performance was significantly improved,and the incidence of longitudinal cracks was reduced from 1.5%to 0.32%during the casting process.

关 键 词：含钛铁素体不锈钢 保护渣 表面质量 连铸 

分 类 号：TF777[冶金工程—钢铁冶金]