Method for increasing final electromagnetic stirring intensity of continuous casting billets

Abstract

The invention belongs to the technical field of metallurgy and in particular relates to continuous casting billet cooling control techniques. The invention provides a method for increasing final electromagnetic stirring intensity to overcome the problem of stirring failure due to poor final electromagnetic stirring capacity of continuous casting billets. An infrared temperature measurement probe is arranged at the tail end of a continuous casting billet and in the position where an electromagnetic stirring device is mounted, to measure surface temperature T1 of the continuous casting billet; the temperature T1 data is compared with the curie-point temperature T of the corresponding steel type; if the Ti value is less than the T value, the temperature difference is calculated; the water-distribution amount required for adjustment can be calculated through a secondary cooling water distribution control system, electric valves are controlled, and the water-distribution amount of each secondary cooling section is adjusted, so that the surface temperature T1 of the continuous casting billet is enabled to be more than or equal to the curie-point temperature T; if the Ti value is more than the T value, the infrared temperature measurement probe continues to measure surface temperature T1 of the continuous casting billet. The method provided by the invention can stabilize and improve the stirring effect of the final electromagnetic stirring intensity of continuous casting billets, so as to stabilize and improve the internal quality of continuous casting billets.

Description

technical field [0001] The invention belongs to the technical field of metallurgical smelting and rolling, and in particular relates to the cooling control technology of continuous casting slabs. Background technique [0002] Electromagnetic stirring mainly uses the traveling wave magnetic field or rotating magnetic field generated by multi-phase coil windings to generate electromagnetic force in conductive molten steel to stir molten steel. Electromagnetic stirring is divided into crystallizer electromagnetic stirring (M-EMS), secondary cooling zone electromagnetic stirring (S-EMS) and final solidification section electromagnetic stirring (F-EMS). The initial electromagnetic stirring is only applied to the crystallizer or the secondary cooling zone alone. With the development of continuous casting, the use of M-EMS or S-EMS alone can no longer meet the requirements of high-quality products, especially for special steel, due to the wide range of chemical composition and wid...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the surface temperature at the position where the electromagnetic stirring is applied at the end of the continuous casting slab is uneven or lower than the Curie point temperature, which affects the magnetic field distribution in the stirring area, and seriously causes the failure of stirring

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