Abstract: A three-dimensional math model of electromagnetic stirring of mold for 380 mm x 280 mm bloom casting is established by using finite element analytic software and the effect of electromagnetic stirring parameters (current intensity 200-500 A, frequency 1.5-3.0 Hz, thickness of mold copper plate 34-40 mm) on distribution of magnetic field in mold is systematically studied. Results show that the max magnetic induction intensity is at center of axis direction of strand and the lower values of magnetic induction intensity are at top and bottom of mold ； with increasing current intensity from 350 A to 500 A, the magnetic induction intensity at center of stirrer increases linearly ； with increasing current frequency from 1.5 Hz to 3.0 Hz, the magnetic induction intensity at center of strand decreases only by 0.0015 T； and with increasing thickness of mold copper plate, the magnetic induction intensity at wide surface, narrow surface and comer of the strand all decreases. In actual casting heavy rail steel U71Mn process, current intensity should be more than 400 A.

Key words: 380 mm x 280 mm Casting Bloom, Mold, Electromagnetic Stirring, Numerical Simulation

摘要： 利用有限元分析软件,建立了380 mm×280 mm大方坯结晶器电磁搅拌的三维数学模型,系统研究了电磁搅拌工艺参数(电流250～500 A,频率1.5～3.0 Hz,结晶器铜板厚度34～40 mm)对结晶器内电磁场的分布影响。结果表明,结晶器内磁感应强度沿铸流轴向呈"两端小、中间大"分布;电流从350 A增大到500 A,搅拌器中心的磁感应强度呈线性递增;频率由1.5Hz增大到3.0Hz,搅拌器中心磁感应强度仅减小0.0015 T;随着结晶器铜板厚度的增大,铸坯宽面、窄面和角部的磁感应强度都减小。在实际连铸U71Mn重轨钢中,电流应该维持在400 A以上。

关键词: 380 mm X 280 mm铸坯, 结晶器, 电磁搅拌, 数值模拟