中文摘要：

结合某钢厂圆坯连铸结晶器,对电磁搅拌工艺参数开展优化试验研究,测定电磁搅拌磁场的分布特征,从而针对性地对电磁搅拌电流和频率这2个主要的工艺参数进行优化。研究结果表明：在工作电流和工作频率下,连铸坯存在的质量缺陷主要体现在中心疏松和缩孔这2个方面,33.3%铸坯的中心疏松级别达到或超过1.5,12%的铸坯出现了不同程度的缩孔;当电流增加到380 A时,中心等轴晶率已基本饱和,最大值达38.4%;当电流为400 A时,铸坯质量得到明显改善。通过综合考虑电磁搅拌的特征及其相对应的冶金效果后,得到优化的电磁搅拌（M-EMS）工艺参数。

英文摘要：

According to a round billet continuous casting mold, the experiments for optimizing the electromagnetic stirring process parameters were performed, and the distribution characteristics of electromagnetic field were measured, so that the current intensity and frequency were optimized. The results show that the quality of round billets is not so good under working conditions, in which the distribution rates of central porosity at or above grade 1.5 are 33.3% and different degrees of shrinkage of 12% round billets emerge. When the current intensity increases to 380 A, the rate of equiaxial grain zone becomes saturated basically with the maximum of 38.4%. When the current intensity is 400 A, the quality of round billets is improved obviously. The optimized mold electromagnetic stirring（M-EMS） parameters are provided considering the metallurgical characteristics and the corresponding actual results of electromagnetic stirring.