METHOD FOR CONTINUOUS CASTING OF SLAB

摘要

A method for continuous casting of a slab, comprises the steps of feeding molten steel into a mold through exit ports of an immersion nozzle ; controlling a stream of the molten steel by an electromagnetic stirrer having a linearly shifting magnetic field, a direction of the linearly shifting magnetic field being toward the immersion nozzle posiotioned at the center of the mold from a pair of the narrow sides of the mold ; a first control step of controlling a frequency of wave of the shifting magnetic field to be higher than a frequency having one cycle period of time, during which the stream of the molten steel poured from the immersion nozzle passes through an area, the area which the linearly shifting magnetic field being introduced to and having the upper limit and the lower limit ; and a second control step of controlling the frequency of the wave of the linearly shifting magnetic field to be lower than a frequency making a density of the magnetic fluxes of the leanerly shifting magnetic field high enough to apply a braking force to the molten steel.