Steady casting technique for inhibiting liquid level fluctuation of continuous casting crystallizer

Abstract

The invention relates to a steady casting technique for inhibiting liquid level fluctuation of a continuous casting crystallizer, and belongs to the technical field of continuous casting techniques inthe metallurgical industry. According to the technical scheme, the technique comprises steps as follows: A. controlling the interference amplitude in the fluctuation superposition frequency range produced by unstable crystallizer liquid level to be the lowest; B, controlling fluctuation in the low frequency range caused by unstable bulging of a casting blank; (3) improving the equipment precisionof the head of a continuous casting machine; (4) using a novel efficient double-hole nozzle or a novel pulse-controlled nozzle. The technique has the beneficial effects that the defect of subsurfaceinclusion of casting blanks due to slag entrapment of molten steel in a crystallizer is greatly reduced, and surface quality of a final product is improved; malignant production accidents such as continuous casting breakout caused by poor lubrication of crystallizer casting powder and uneven initial blank shell of the crystallizer are greatly reduced.

Description

Technical field [0001] The invention relates to a steady-state casting process method for suppressing fluctuations in the liquid level of a continuous casting mold, and belongs to the technical field of continuous casting processes in the metallurgical industry. Background technique [0002] In the continuous casting process of the continuous casting machine, the mold acts as a dynamic balance body. As long as the volume of molten steel flowing in per unit time is equal to the volume of the slab drawn out, the liquid level in the mold can be guaranteed to be stable. Once either the inflow or outflow deviates from the balance, it will cause the crystallizer liquid level to fluctuate. The fluctuation of the mold liquid level not only affects the stability of continuous casting production, but also has a great impact on the quality of the cast slab. With the intensification of crystallizer liquid level fluctuations, the content of non-metallic inclusions under the cast slab skin in...

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Problems solved by technology

Through the technical analysis of 30 scientific papers and 21 related patents on the liquid level fluctuation of the continuous casting mold at home and abroad, it is found that the reasons for the liquid level fluctuation of the continuous casting mold are very complicated, and the factors involved include mechanical equipment, continuous casting process, Electrical control, continuous casting refractories, the shape and quantity of molten steel inclusions, etc., but the real reason for the fluctuation of the crystallizer liquid level has not been clearly analyzed, resulting in various specific measures to control the fluctuation of the crystallizer liquid level. Fluctuations, good jet lag, can not be fundamentally resolved

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