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针对某厂60Si2CrVAT弹簧钢小方坯连铸坯存在的中心等轴晶率低以及比较严重的中心碳偏析等质量问题,系统研究了不同电磁搅拌工艺参数对断面150mm×150mm结晶器内磁场特性的影响,并通过工业试验研究了结晶器电磁搅拌(M-MES)电流和频率对宏观凝固组织和铸坯碳偏析的影响。研究结果表明:结晶器电磁搅拌(M-MES)电流增大,中心等轴晶率提高,铸坯中心碳偏析减小;搅拌频率对等轴晶率和铸坯中心碳偏析的影响呈非线性;优化最佳匹配的电磁搅拌电流和频率分别为340A和3.5Hz时,中心等轴晶率从21%增加到33%,中心碳偏析指数从1.22降低到1.05,消除了中心缩孔,铸坯内部质量有明显的改善。
Aiming at the quality problems of 60Si2CrVAT spring steel billet slab, such as central equiaxed grain rate and more serious central carbon segregation, the electromagnetic field characteristics of 150mm × 150mm section Influence of M-MES current and frequency on carbon segregation of macroscopically solidified structure and slab was studied through industrial experiments. The results show that the current of the M-MES increases, the center equiaxed grain rate increases, and the segregation of carbon in the center of the slab decreases. The equiaxed grain ratio of stirring frequency has a nonlinear effect on the carbon segregation at the slab center ; When the optimal matching current and frequency of electromagnetic stirring are 340A and 3.5Hz respectively, the center equiaxed grain rate increases from 21% to 33% and the center carbon segregation index decreases from 1.22 to 1.05, which eliminates center shrinkage and slab Internal quality has been significantly improved.