关键词: IF钢, 高拉速, 结晶器电磁搅拌, 数值模拟, 结晶器流场, 夹杂, 气泡

Abstract:  In order to solve the problem of high sealing rate of inclusions and bubble defects in IF steel with high drawing speed， the effects of immersion depth and drawing speed on the flow field of mold were studied by numerical simulation. The results show that under condition of the electromagnetic stirring current intensity 600 A and frequency 3.5 Hz， with the casting speed increases， the active index of free liquid level shows a trend of first increasing， then decreasing and then increasing. At the casting speed about 1.05 m/min， max value is up to 0.67， at the casting speed about 1.6 m/min， the minimum value is 0.35， the flow-field uniformity index is slightly reduced， the best free liquid level active index is 0.5 ± 0.05； When the casting speed is below 1.0 m/min， with the SEN immersion depth increases， the free liquid surface active index gradually increases to 0.40； When the casting speed is greater than 1.0 m/min， with the SEN immersion depth increases， The free liquid surface active index index gradually decreases； When the casting speed is greater than 1.4 m/min， with the SEN immersion depth increases， the free liquid level active index drops sharply to 0.37； After the optimization of mold electromagnetic stirring process of IF steel ， the average sealing rate of inclusions and bubble defects in the casting billet decrease by 4%， and remarkable results are obtained.

Key words:  , Interstitial Free Steel； High Casting Speed； Mold Electromagnetic Stirring； Numerical Simulation； Mold Flow Field； Inclusion； Bubble