A device and method for controlling inclusion and skull defects in a continuous casting slab production process

CN122913478APending Publication Date: 2026-10-16INNER MONGOLIA BAOTOU STEEL UNION
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Patent Information

Application Number
CN202611076729.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-20
Publication Date
2026-10-16

AI Technical Summary

Technical Problem

这些夹杂物若未能有效去除或控制，将导致板材内部缺陷、表面质量问题，甚至引发断裂事故

Benefits of technology

[0021] This invention, through its large-capacity tundish, multiple baffles, and air curtain design, extends the molten steel residence time by more than 30% and increases the inclusion flotation rate by 40% to 60%. After optimizing the crystallizer flow field, the slag entrapment rate is reduced by more than 80%, and the liquid level fluctuation is controlled within ±3mm. The full-process protection system effectively prevents secondary oxidation, reducing the total oxygen content of the molten steel to below 15ppm and the number of microscopic inclusions by more than 50%. The system's collaborative control enables intelligent management of the entire process and is suitable for the production of high-purity steel grades (such as pipeline steel, automotive steel, and silicon steel). It has a simple structure, low investment cost, and is easy to retrofit and promote on existing continuous casting machines.

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Abstract

The application discloses a kind of inclusions and coil slag defect control device and method in continuous casting slab production process, including tundish, the tundish adopts the tundish structure setting of molten pool depth ≥1000mm, flow guide wall is fixedly arranged in the tundish, the flow guide wall is interval arranged along the tundish, and interval flow guide dam is fixedly arranged between the flow guide wall, the flow guide wall and flow guide dam form "U type" flow path, long nozzle protection is used between the tundish and ladle, impact pad is fixedly arranged in the bottom of the tundish, the impact pad is below long nozzle of ladle, tundish lower nozzle is arranged on the side of the bottom of the tundish away from the long nozzle, submerged entry nozzle is used between the tundish and crystallizer, further including control system, control system is connected with level gauge and temperature sensor arranged in tundish by connecting line, control system is also connected with crystallizer liquid level sensor arranged on crystallizer by connecting line.
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