Method for rapidly replacing tundish in molten steel continuous casting process

Abstract

The invention discloses a method for rapidly replacing a tundish in the molten steel continuous casting process. After pouring stopping of a crystallizer, heating type protection slag is rapidly laid and scattered on the molten steel liquid level in the crystallizer, the aluminum component is rapidly oxidized, a proper amount of heat is released, heating and heat preservation are conducted on molten steel in the crystallizer, crusting and excessively fast blank shell shrinkage due to temperature reduction of the molten steel liquid level are effectively prevented, an immersed water gap in a new tundish can be smoothly inserted in the molten steel in the crystallizer, and the rapid replacing success rate of the tundish is increased. By means of the method, rapid tundish replacing can be conducted when the molten steel liquid level in the crystallizer is high, the molten steel liquid level in the crystallizer is not obviously changed all the time in the whole tundish replacing process, the situation that when the tundish is replaced at the low liquid level, the huge rising and falling changes happen to the molten steel liquid level in the crystallizer is avoided, and the continuous casting stability and pre-and-post consistency of the cast blank quality before temporary pouring stopping and after pouring starting is conducted again are guaranteed.

Description

Technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for quickly replacing a tundish in a molten steel continuous casting process. Background technique [0002] The quick change of the tundish of the continuous casting machine is the operation method of quickly replacing the tundish in the continuous casting mode, so that the molten steel in the mold is connected end to end and continued pouring. [0003] Affected by the erosion of steel slag and the erosion of molten steel, the tundish needs to be replaced after the tundish lining, stopper rod, and tundish nozzle have reached a certain life span. Therefore, the online rapid replacement of the tundish will increase the number of continuous casting furnaces of the caster. Effective means of casting machine operating rate and productivity. [0004] During the online quick-change tundish operation, affected by the cooling of the mold copper plate, radiant heat, natural air...

AI Technical Summary

Problems solved by technology

[0004] During the online quick change tundish operation, affected by factors such as mold copper plate cooling, radiation heat release, air natural cooling, and long stop and straightening time, it often occurs that the liquid steel surface in the mold solidifies and crusts or the primary billet shell shrinks too much As a result, the new and old slab shells in the mold cannot be effectively fused when the tundish is changed quickly, resulting in a breakout accident or a lying slab accident after the slab leaves the mold

Failure to quickly change the tundish will cause equipment damage to the continuous casting machine, long-term processing of lying billets and other major losses

[0005] Therefore, how to effectively prevent the molten steel from encrusting and shrinking too quickly during the rapid replacement of the tundish, and improve the success rate of the quick replacement of the tundish is a technical problem urgently needed by those skilled in the art.