METHOD OF CONTINUOUS CASTING OF STEEL

摘要

Disclosed is a method of continuous casting of steel by braking a molten steel flow by means of direct-current magnetic fields applied to a pair of upper magnetic poles and a pair of lower magnetic poles while the molten steel is agitated by means of an alternating-current magnetic field superimposed on the pair of upper magnetic poles using a continuous casting machine including the pair of upper magnetic poles that are disposed outside a mold so as to oppose each other with long side portions of the mold interposed therebetween, the pair of lower magnetic poles that are disposed outside the mold so as to oppose each other with the long side portions of the mold interposed therebetween, and molten steel spouts of an immersion nozzle located between the peak position of the direct-current magnetic field of the upper magnetic poles and that of the direct-current magnetic field of the lower magnetic poles. The intensity of the alternating-current magnetic field applied to the upper magnetic poles and the intensities of the direct-current magnetic fields applied to the upper magnetic poles and the lower magnetic poles are controlled in a specific range in accordance with the width of slabs to be cast and the casting speed. With this, high-quality cast slabs with fewer defects caused by bubbles and flux can be obtained.