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为减少矩形坯角裂、漏钢等缺陷,提高铸坯质量,进行改变浸入式水口出口倾角角度以优化结晶器流场的研究。通过Fluent软件,对150 mm×380 mm矩形坯结晶器钢液流动和凝固耦合过程进行数值模拟,得出水口倾角(15°~30°)对表面流速、表面湍动能和冲击深度的影响。结果表明,随水口倾角增加,平均表面流速下降,冲击深度增加,有利于稳定液面;但随倾角增加,液面波动小,不利于钢液搅拌和夹杂物去除,下部回旋区过低,坯壳变薄,容易产生漏钢;综合得出,150 mm×380 mm铸坯的水口倾角宜为25°。应用结果得出使用优化水口后,铸坯中夹杂物总数减少36%。
In order to reduce the defects such as the corner crack of the rectangular billet and the steel leakage, improve the quality of billet and change the angle of dip angle of submerged entry nozzle to optimize the flow field of mold. The flow and solidification coupling process of 150 mm × 380 mm rectangular billet mold were numerically simulated by Fluent software, and the effect of nozzle inclination (15 ° ~30 °) on the surface velocity, surface turbulence kinetic energy and impact depth was obtained. The results show that with the increase of dip angle, the average surface velocity decreases and the impact depth increases, which helps to stabilize the liquid surface. However, with the increase of inclination angle, the fluctuation of liquid surface is small, which is not conducive to molten steel mixing and inclusions removal. Shell thinning, prone to breakout; comprehensive conclusion, 150 mm × 380 mm slab nozzle inclination should be 25 °. The results show that the total number of inclusions in slab decreases by 36% after using the optimized nozzle.