结晶器电磁搅拌电流对Φ650mm大圆坯内部质量的影响  

Effect of Mold Electromagnetic Stirring Current on Internal Quality of Φ650 mm Heavy Round Bloom

作　　者：孙涛[1] 岳峰[1] 吴华杰[1] 郭春[1] 马忠存 李瑛 郭鑫 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北满特殊钢有限公司,齐齐哈尔161041

出　　处：《特殊钢》2015年第5期43-46,共4页Special Steel

摘　　要：通过铸坯低倍组织宏观检验方法和金属原位统计分布分析技术，以钢厂生产的35钢（0．35％C）为例，研究了结晶器电磁搅拌电流（200～450A，3Hz）对φ650mm大断面连铸圆坯等轴晶率、致密度和碳偏析度的影响。结果表明，搅拌频率3Hz时，结晶器电磁搅拌电流由200A增加至450A时，等轴晶率由24．2％提高至56．8％，同时铸坯各区域致密度呈现逐渐增大的趋势，其中铸坯中心区域致密度增加明显，由0．8649增至0．9376；随着搅拌电流的增加，铸坯碳偏析度呈现逐渐减轻的趋势。综合考虑各因素，当结晶器电磁搅拌电流为450A，频率为3Hz，铸坯等轴晶比例最大，铸坯内部质量最好。With using the macro examination method for macro structure of casting bloom and the analysis technology for metal original position statistic distribution the effect of mold electromagnetic stirring current （200 -450 A, 3 Hz） on e- quiaxed crystal zone rate, density fraction and carbon segregation of φ650 mm heavy round casting bloom of 0. 35C steel produced at steelworks has been studied. Test results show that with stirring frequency 3 Hz as current increases from 200 A to 450 A, the equiaxed crystal zone rate increases from 24. 2% to 56. 8% while the density fraction of each zone in casting bloom increases gradually and the density fraction at center zone of casting bloom increases obviously i.e. from 0.864 9 in- creasing to 0. 937 6, and with increasing stirring current the carbon segregation of casting bloom occurs the trend to lighten. Comprehensively considering each factor, as mold electromagnetic stirring current is 450A with frequency 3 Hz the equiaxed crystal zone rate in bloom is largest and the internal quality of bloom is best.

关 键 词：φ650 mm大断面圆坯结晶器电磁搅拌等轴晶率致密度碳偏析 

分 类 号：TF777[冶金工程—钢铁冶金]