Method for heat preservation of molten steel in abnormal molten steel tank

Abstract

The invention relates to a method for heat preservation of molten steel in an abnormal molten steel tank. The method comprises the following steps: 1) feeding the molten steel tank into an LF furnace for refining; 2) after refining is finished, stopping ladle bottom argon blowing stirring of the abnormal molten steel tank, lowering an electrode of the LF furnace to a steel slag interface, and carrying out heating for 1-3 min;3) after heating is finished, removing an argon blowing pipe, moving out the molten steel tank, covering the molten steel tank with a cover, and carrying out pouring in front of a machine. According to the method, heat preservation control is performed on top molten steel mainly in a manner of heating for refining of the LF furnace and stopping molten steel argon blowing stirring, and stable control of the temperature of a tundish in the molten steel pouring process is realized. The method is convenient and feasible in technology and simple to operate, cost input for changing the heat preservation performance of a refractory material is not required, a heat preservation agent is not required to be added by a worker for heat preservation, the labor intensity of the worker is reduced, and the production rhythm of procedures is not affected.

Description

Technical field [0001] The present invention relates to the field of smelting, and more particularly to an abnormal steel water tank steel water insulation. Background technique [0002] After the steel water is treated with the LF furnace, the convection of the casting machine is pouring. Due to the impact of the insulation performance of the wire, the temperature of the steel water is constantly decreasing, especially the steel tank, the steel tank, the water tank after the small repair time is long, and the temperature of the water is faster, which will seriously affect the intermediate package steel. Control of water overheat. Excessive intermediate package steel temperature, resulting in deterioration of molten steel, not conducive to the full upper floating of inclusions in the middle package, the inclusions in the steel are very easy to spit out of the holes in the water, and the diameter water port and the middle packet underwater joint At the point of adhesion, the occur...

AI Technical Summary

Problems solved by technology

Due to the influence of the thermal insulation performance of the ladle, the temperature of the molten steel continues to decrease as the pouring progresses, especially for the molten steel tanks with a long turnaround time or after major repairs or minor repairs, the temperature drops rapidly in the later stage of pouring, which will seriously affect the tundish steel Water superheat control

Too low temperature of molten steel in the tundish will lead to poor fluidity of molten steel, which is not conducive to the full floating of inclusions in the tundish. Adhesion and aggregation at places, resulting in the occurrence of low-temperature flocculation accidents, which not only affects the quality of the product, but also easily causes casting machine interruption accidents, affects the smooth flow of production, and reduces the operation rate of the casting machine

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