Method for continuous casting of slab
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United States of America Patent
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May 3, 1994
Issued Date -
N/A
app pub date -
Aug 30, 1993
filing date -
Dec 31, 1991
priority date (Note) -
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Abstract
A method for continuous casting of a slab comprises feeding molten steel into a mold through exit ports of an immersion nozzle and controlling a stream of the molten steel by means of an electromagnetic stirrer having a linearly shifting magnetic field. The direction of the linearly shifting magnetic field is toward the immersion nozzle, which is positioned at the center of the mold from a pair of narrow sides of the mold. A first frequency control step controls a frequency of a wave of the shifting magnetic field to be higher than a threshold frequency, wherein the wave has a period equal to the time during which the stream of the molten steel poured from the immersion nozzle passes through an area to which the linearly shifting magnetic field is introduced, said area having an upper limit and a lower limit. A second control step controls 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.
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