PURPOSE: To prevent the slag on the surface from being included into molten steel and improve the yield of molten steel by acting a rotating magnetic field opposite to the vortex at nozzle inlet when the molten level in a tundish lowers below a prescribed value.
CONSTITUTION: Iron cores 7 wound with coils 8 are disposed around the root of a tundish nozzle 4 thereby forming a rotary magnetic field generator 6. When the molten metal level 1a in a tundish 3 lowers below the prescribed level, 3-phase AC is conducted into the coils 3 to stir molten steel 1 in the direction opposite to its vortex. Since the inclusion of slag 5 in the molten metal is prevented by the above method despite lowering of the molten metal level 1a below the prescribed level, the yield of the molten steel is correspondingly improved.
MIYAZAKI YASUHARU
KATOU YASUNORI
