Electromagnetic Stirring Device and Method for Secondary Cooling Zone of Slab Continuous Casting

Abstract

The invention discloses an electromagnetic stirring device and a method for a secondary cooling zone of slab continuous casting. The device comprises a main body of the electromagnetic stirring device, an opening adjustment assembly and a secondary cooling assembly. The main body of the stirring device includes a protective shell (3), a phase sequence control component, an iron core (4) and an electromagnetic coil (5), and electromagnetically stirs the molten steel in a direction-changing manner by changing the phase sequence of the three-phase current; the opening adjustment component includes a cylinder (7) , the fixed seat (8), the movable joint shaft (12) and the silicon steel sheet group insert (13), the opening degree of the closed annular iron core can be adjusted online through the movable joint structure; the secondary cooling assembly includes the cooling water inlet (9) and the cooling The water nozzle (10) soaks the cooling water to cool the electromagnetic coil and the iron core, and then is sprayed onto the surface of the billet (1) through the cooling water nozzle for secondary cooling. The invention has less magnetic field leakage or loss, high electromagnetic stirring efficiency, online adjustment of the opening degree of the stirrer, alternate change of stirring direction, and improves the internal quality and performance of the slab.

Description

technical field [0001] The invention relates to an electromagnetic stirring device and method used in the technical field of continuous casting, in particular to an electromagnetic stirring device and method in the secondary cooling zone of slab continuous casting. Background technique [0002] In the continuous casting process, the equiaxed crystal ratio is the main index to determine the quality and performance of the slab, generally in the range of 20~40%. If the equiaxed grain rate is too low, intergranular cracks are likely to occur during the solidification of the slab and during subsequent rolling; moreover, the solidification mode of steel mainly columnar grains is often accompanied by severe central component segregation, and the existence of these problems is very troublesome Improve the internal quality and performance of the billet. Practice has proved that for continuous casting of high carbon steel, silicon steel, stainless steel, etc., it is often required to...

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Problems solved by technology

For roller stirring, although the stirring roller can be in contact with the slab, due to the limitation of the cavity size inside the stirring roller and the shielding effect of the roller sleeve on the magnetic field, the strength of the stirring magnetic field generated inside the slab is actually not very strong. high

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