Method for continuous casting of slab

A method for continuous casting of a slab, comprising the steps of:

• feeding molten steel into a mold through exit ports of an immersion nozzle, the mold having a pair of wide sides and a pair of narrow sides, and the immersion nozzle being positioned at the center of the mold from the pair of narrow sides;
• controlling a stream of the molten steel by means of an electromagnetic stirrer having a linearly shifting magnetic field, a direction of the linearly shifting magnetic field being toward the immersion nozzle, and distributions of magnetic fluxes of the linearly shifting magnetic field being symmetrical relative to a center line of the immersion nozzle;
• a first control step of controlling a frequency of a wave of the linearly shifting magnetic field to be higher than a threshold frequency, said wave having said threshold frequency having a period equal to the time during which the stream of the molten steel fed into the mold from the immersion nozzle passes through a field area to which the linearly shifting magnetic field is introduced, said field area having an upper limit and a lower limit;
• and
• a second control step of controlling the frequency of the wave of the linearly shifting magnetic field to be low enough such that the magnetic fluxes of the linearly shifting magnetic field are of a density high enough to apply a braking force to the molten steel.