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采用对比试验研究的方法分析不同电磁搅拌强度下对低碳钢大方坯铸坯内部质量的影响,试验中采用搅拌电流分别为200、250、300、350 A。研究结果表明:增大低碳钢HRB335钢连铸结晶器电磁搅拌电流强度可以显著改善铸坯内部质量,铸坯中心区域等轴晶率由21.22%增至26.51%;搅拌电流对HRB335钢铸坯中心偏析、中心疏松等没有明显影响,铸坯横断面碳成分分布均比较均匀。使用结晶器电磁搅拌后,凝固前沿的液相对流会加剧,对以柱状晶生长的凝固前沿进行冲刷和清洗,凝固前沿的液相流动使母液与两相区的液体互相混合,使溶质浓度趋向均匀。
The influence of different electromagnetic stirring intensities on the internal quality of slab of mild steel was analyzed by the method of comparative experiment. The stirring current in the experiment was 200, 250, 300 and 350 A respectively. The results show that increasing the current intensity of electromagnetic stirring of HRC335 steel continuous casting mold can significantly improve the internal quality of slab, the equiaxed grain rate increases from 21.22% to 26.51% in the central region of slab; Center segregation, loose center, etc. no significant impact on the distribution of carbon cross-section of the slab are more evenly distributed. After the mold is electromagnetically stirred, the convection of the liquid phase at the solidification front will be aggravated, and the solidification front where the columnar crystal grows will be washed and cleaned. The liquid phase in the front of the solidification flow causes the mother liquid and the liquid in the two-phase region to mix with each other, Evenly.