A Steady-state Casting Process Method for Suppressing Fluctuation of Liquid Level in Continuous Casting Mold

Abstract

The invention relates to a steady-state casting process method for suppressing liquid level fluctuations in a continuous casting crystallizer, and belongs to the technical field of continuous casting processes in the metallurgical industry. The technical solution of the present invention is: A. controlling the fluctuation in the superimposed frequency range caused by the instability of the crystallizer liquid level has the lowest interference amplitude; B. controlling the fluctuation in the low frequency range caused by the unsteady bulge of the slab; (3) improving the continuous The equipment accuracy of the head of the casting machine; (4) Use new high-efficiency double-jet nozzles or new pulse control nozzles. The beneficial effects of the present invention are: greatly reducing the subcutaneous inclusion defects of the cast slab caused by molten steel slag rolling in the crystallizer, improving the surface quality of the final product; greatly reducing the poor lubrication of the mold mold slag and the uneven shell of the mold primary slab Vicious production accidents such as continuous casting breakouts caused.

Description

technical field [0001] The invention relates to a steady-state casting process method for suppressing liquid level fluctuations in a continuous casting crystallizer, 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 is a dynamic balance body. As long as the volume of molten steel flowing in is equal to the volume of the slab pulled out within a unit time, the liquid level in the mold can be guaranteed to be stable. Once either inflow or pullout deviates from the balance, it will cause the liquid level of the crystallizer to fluctuate. Fluctuations in the liquid level of the mold not only affect the stability of continuous casting production, but also have a great impact on the quality of the slab. With the intensification of the crystallizer liquid level fluctuation, the content of non-metallic inclusions under the skin ...

AI Technical Summary

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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