矩形坯高拉速连铸结晶器开发与应用  

Development and application of high speed continuous casting mold for rectangular billets

作　　者：聂荣恩 么旭林 崔猛 NIE Rongen;YAO Xulin;CUI Meng(Tianjin New Tiangang United Special Steel Co.,Ltd.,Tianjin 301500,China)

机构地区：[1]天津市新天钢联合特钢有限公司,天津301500

出　　处：《炼钢》2023年第5期48-56,共9页Steelmaking

摘　　要：均匀传热是高拉速连铸结晶器的基本要求。采用数值模拟方法,建立了某钢厂1号矩形坯连铸机结晶器内坯壳凝固热-力耦合有限元模型,研究分析了原窄面平面型结晶器内坯壳凝固传热行为规律,在此基础上设计开发了新型曲面结构结晶器,对比分析了结晶器内坯壳凝固变形、气隙与保护渣膜、铸坯表面温度分布等演变。结果表明,传统窄面平面型结晶器易引发铸坯角部附近区域生成厚气隙与保护渣膜,阻碍坯壳偏离角区高效传热,从而引发高拉速连铸下铸坯宽面偏离角区显著凹陷缺陷。采用新型曲面结晶器,可大幅减少铸坯角部与偏离角区的气隙及保护渣膜厚度,促进结晶器内坯壳均匀化传热,消除高拉速连铸生产条件下铸坯偏离角凹陷,并提升结晶器使用寿命80%。Uniform heat transfer is the key requirement of the mold with high continuous casting speed.In this study,a thermo-mechanical coupling finite element model for the solidification of shell in the mold of No.1 rectangular billet continuous caster in a steel plant was established by using numerical simulation method.And the heat transfer behavior of solidifying shell in the conventional mold with plane shape narrow face cooper plate was studied.On the basis of this,a new curved surface structure mold was designed,and the evolution of shell solidification deformation,air gap and mold flux film,slab surface temperature distribution in the mold were analyzed by comparison.The results show that the conventional mold with plane shape narrow face copper plate is easy to cause the thick air gap and mold flux film distribute near the slab corner,which may greatly affect the heat transfer efficiency of the slab off-corner area,and thus cause the obvious depression defect on the slab wide face off-corners under high casting speed.The application of a new curved mold can greatly reduce the air gap and the thickness of the mold flux film between around the corner and the off-corners.Thus the heat transfer of the solidification shell in the mold becomes more uniform to eliminate the depression of the off-corners during high speed continuous casting.Also,the service life of the new mold is improved by 80%.

关 键 词：连铸 高拉速 结晶器 凝固 

分 类 号：TF777[冶金工程—钢铁冶金]