Electromagnetic stirring device and electromagnetic stirring method for slab continuous casting secondary cooling area

Abstract

The invention discloses an electromagnetic stirring device and electromagnetic stirring method for a slab continuous casting secondary cooling area. The electromagnetic stirring device comprises an electromagnetic stirring device main body, an opening adjusting assembly and a secondary cooling assembly, wherein the stirring device main body comprises a protective shell (3), a phase sequence control assembly, an iron core (4) and an electromagnetic coil (5), and molten steel is subjected to variable-direction electromagnetic stirring through three-phase current phase sequence conversion; the opening adjusting assembly comprises an air cylinder (7), a fixed seat (8), a movable joint shaft (12) and a silicon steel sheet assembly inserting sheet (13), and the opening degree of the closed annular iron core is adjusted online through the movable joint structure; and the secondary cooling assembly comprises a cooling water inlet (9) and a cooling water nozzle (10), and cooling water soaks andcools the electromagnetic coil and the iron core, and is sprayed to the surface of a casting blank (1) through the cooling water nozzle for secondary cooling. According to the electromagnetic stirring device and electromagnetic stirring method for the slab continuous casting secondary cooling area, the leakage or loss of a magnetic field is less, the electromagnetic stirring efficiency is high, the opening degree of the stirring device can be adjusted online, and the stirring direction is changed alternately, so that the internal quality and performance of the casting blank are improved.

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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