板坯全铸流三维流动和传热凝固行为研究

Study on three-dimensional flow and heat transfer and solidification behavior in slab continuous casting process

基于工业射钉试验,建立了研究板坯连铸过程流动、传热与凝固行为的三维耦合数值模型,利用分段计算模型获得整个板坯连铸过程的凝固进程。以直上钢Q235B中厚板坯连铸为例,指出侧孔出流高温钢液对窄面初凝坯壳有强烈的冲刷作用,易引发铸坯质量缺陷或漏钢事故的发生。距离弯月面10.13和12.08 m处射钉样的坯壳厚度分别为67和77 mm,与模型预测结果基本吻合。当前工况下凝固末端液芯呈现"W"状,这与结晶器内过热耗散的不均匀分布有关,其凝固终点为16.8 m。

Based on the industrial nailing experiment,a coupled three-dimensional numerical model has been developed to describe the fluid flow,heat transfer and solidification of slab continuous casting process.Using the segment model to obtain the solidification process of the entire slab continuous casting process.Based on the thick slab continuous casting of Q235 B steel by LD-CC,point out that the high-temperature molten steel outflow of the side hole has a strong washing effect on the initial solidified on narrow face,which can cause quality defects or breakout accident in slab casting.The shell thickness of the nail-shooting shells at the 10.13 m and 12.08 m meniscus is 67 mm and 77 mm respectively,which is great agreement with the model prediction results.Under the current working conditions,the solidified end liquid core exhibits a"W"shape,which is related to the uneven distribution of heat dissipation in the mold,and its solidification point is 16.8 m.