方坯结晶器角部钢液初始凝固行为及其影响因素的数值模拟分析

Numerical simulation analysis of the initial solidification behavior of liquid steel and its influence factors in the corner of billet mold

针对方坯结晶器内角部区域钢液的初始凝固行为,建立耦合方坯、保护渣和结晶器铜板的传热数学模型,研究结晶器圆角半径、角部铜板厚度及冷却水量对铸坯角部温度分布及凝固坯壳厚度的影响。结果表明,增大结晶器圆角半径、增加角部铜板厚度或降低结晶器内冷却水量,均可一定程度上改善初始凝固区域铸坯凝固坯壳厚度的周向均匀性,提升铸坯质量;其中,增大结晶器圆角半径的影响效果最为显著。

Aiming at the initial solidification behavior of liquid steel in the corner part of billet mold, this paper established heat-transfer mathematical models that coupled billet,mold flux film and mold copper plate.The effects of corner radius,copper plate thickness in the corner part and cooling water flow rate on the temperature distrubition in billet corner as well as initial solidified shell thickness were analyzed.The results show that increasing the corner radius of mold or the copper plate thick-ness in the corner part or decreasing the cooling water flow rate can improve,to some extent,the cir-cumferential uniformity of the solidified shell thickness of the billet in the initial solidification region, and the billet quality is therefore improved.Among them,increasing the mold corner radius exhibits the most remarkable effect.