ABSTRACT

The effects of the difference of the heat flux between the wide face and narrow face of the mould, the mould taper, casting speed and cooling rate on unevenness of hypo-peritectic steel at the off-corner in the mould, which leads to longitudinal cracking, bleeding and breakout during continuous casting, were evaluated by a finite element model (FEM) simulation and a plant test with a commercial continuous caster. The simulation results show that an increase in the difference in the heat flux between the wide and narrow face increases the off-corner unevenness of solidification because the solidified shell on the low heat flux side is pulled toward the high heat flux side. The analysis results were in good agreement with the plant test results. These results revealed the importance of optimizing the heat flux ratio between the wide face and narrow face mould even under a high casting speed condition.

摘要

结晶器宽窄面热通量差、结晶器锥度、浇注速度和冷却速度对结晶器偏角亚包晶钢不均匀性的影响，导致纵向开裂通过有限元模型 (FEM) 模拟和使用商用连铸机进行的工厂试验评估了连铸过程中的流血和爆裂。模拟结果表明，宽窄面之间热通量差异的增加会增加凝固的偏角不均匀性，因为低热通量侧的凝固壳被拉向高热通量侧。分析结果与工厂试验结果吻合较好。