Method for quickly replacing tundish with high-carbon steel in slab continuous casting

By controlling the matching of the tonnage of the middle bag and the casting speed and the adjustment of the cooling water flow of the crystallizer, the problems of tail billets and joint billets during continuous casting of high-carbon steel are solved, and the stability and production capacity of the fast replacement of high-carbon steel is achieved.

CN120480131APending Publication Date: 2025-08-15МААНЬШАНЬ АЙРОН ЭНД СТИЛ КО ЛТД
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Patent Information

Application Number
CN202510669338.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-23
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

During the continuous casting of high-carbon steel, the tail blank is prone to falling off when the casting is stopped normally, and there is a problem of the joint steel or the cast blank not leaving during the quick replacement of the middle bag, which affects the operating rate and production capacity of the casting machine.

Method used

By controlling the matching of the tonnage of the middle package and the casting speed, including slowly reducing and increasing the casting pulling speed, and adjusting the cooling water flow rate of the wide and narrow surface of the crystallizer, we ensure that the surface of the high-carbon steel casting billet is uniformly cooled and avoiding local cooling transitions and excessive shrinkage.

Benefits of technology

The stability of the fast replacement of high-carbon steel in the middle is achieved, the problems of block dropping and joint blanks are solved, and the operation rate and economic benefits of the casting machine are improved.

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Abstract

The invention relates to the technical field of slab continuous steel casting in the metallurgical industry, and discloses a method for rapidly replacing a high-carbon steel tundish in slab continuous casting. The method comprises the steps that when the tonnage of an old tundish is 45-50 t, the pulling speed is reduced to 0.8-0.9 m / min; when the tonnage of the old tundish is 22-25 t, the pulling speed is reduced to 0.35-0.45 m / min; when 16-18 t of old tundish molten steel is left, the pulling speed is reduced to 0.1-0.2 m / min; the casting speed is increased to 0.35-0.45 m / min when the liquid level of the crystallizer reaches a set value, and the casting speed is increased to 0.35-0.45 m / min when the casting speed is increased to 0.35-0.45 m / min when the casting speed is increased to 0.35-0.45 m / min; and when the new tundish molten steel reaches 45-50 t, the pulling speed is increased to 0.8-0.9 m / min. According to the method, the problem of tail blank chipping in the normal casting stopping process of the slab continuous casting high-carbon steel can be completely eradicated, and the problem that a joint blank is bumped or a casting blank cannot move in the slab continuous casting high-carbon steel tundish quick changing process is solved.
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