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