Abstract: The effect of current(150～500 A)of mold electromagnetic stiring(M-EMS)technology on metallurgy quality of 280 mm×380 mm,280 mm×325 nm concasting bloom of heavy rail steel U75V etc grade has been tested and studied. Results showed that with the current increasing from 250 A to 500 A,the percentage of equiaxed zone increased from 18.8% to36.2%,the total inclusion amount decreased from8.53 mg/10kg to4.68 mg/10kg and the percentage of ratting units ≤1.0 of defects centre porosity,segregation,shrinkage cavity,centre cracks and midway cracks was up to 98%.As concasting stiring current was 350~400 A for medium carbon steels and concasting stiring current was 250 A for low carbon steels,the percentage of ratting units ≤1.0 of casting bloom intemal defects was respectively up to93% and 90%.

摘要： 试验研究了电磁搅拌的电流(150～500 A)对重轨钢U75V等钢种(mm)280×380、280×325连铸坯冶金质量的影响。结果表明,当电流由250A提高至500A时,重轨钢U75V铸坯中心区等轴晶率由18.8%增至36.2%,夹杂总量由8.53mg/10kg降至4.68mg/10kg,中心疏松、偏析、缩孔、中心裂纹和中间裂纹等缺陷≤1.0级别的比例达98%。中碳钢连铸电磁搅拌电流为350～400A,低碳钢连铸电磁搅拌电流为250A时,铸坯内部缺陷≤1.0级的比例分别为93%和90%。

关键词: 方坯, 连铸,  , 电磁搅拌,  , 冶金质量