A tundish composite flow control process and equipment for slab continuous casting machine

Abstract

The invention discloses a tundish composite flow control process for a slab continuous casting machine and equipment of the tundish composite flow control process. The process includes a stopper rod flow control operation stage and a submersed nozzle flow control stage, the stopper rod flow control operation stage is applied to a low casting speed state of the slab continuous casting machine, and the submersed nozzle flow control stage is applied to a normal casting speed state of the slab continuous casting machine. The equipment comprises a stopper rod and a stopper rod driving part for driving the stopper rod to move up and down. The process has the advantages that the stopper rod is used for flow control during an initial cast-on process of a tundish and an unsteady production process; after normal casting of the slab continuous casting machine, the stopper rod is lifted to a high-order position, sized casting of a submerged nozzle is adopted, and composite flow control casting is realized by cooperation of the two processes; on one hand, scouring erosion of the tundish stopper rod is reduced, and flow control reliability is improved; on the other hand, erosion scouring of a stopper rod head is reduced, accident loss caused by the fact that flow is out of control is reduced, and service life of the tundish is prolonged. The equipment has the advantages of simplicity, less investment, convenience in operation and long service life of the tundish.

Description

technical field [0001] The invention relates to the technical field of steel plate casting, in particular to a tundish compound blanking process for a slab caster and equipment designed for completing the process. Background technique [0002] In the steelmaking and continuous casting production of metallurgical enterprises, the molten steel solidifies to form a cast slab after passing through the ladle-tundish-mold. Among them, the tundish is a transitional container, and the stable control of the tundish injection flow is an important step in the production of large slab continuous casting. process link. [0003] At present, there are two known methods of controlling the casting flow in the tundish of large slab continuous casting machines: slide plate flow control and stopper rod flow control. As the slide plate flow control method, due to the frequent opening and closing of the slide plate, the slide plate is severely worn and has a short service life. Steel channeling ...

AI Technical Summary

Problems solved by technology

The main problem is also erosion and erosion by molten steel, grooves and protrusions on the round head of the stopper rod and the surface of the bowl mouth of the upper nozzle are difficult to ensure the stability of the steel flow, especially the production of high manganese series (Mn>1.2%) steel grades is more serious, extremely serious It is easy to cause injection runaway, leading to production accidents such as molten steel rising in the mold and forced shutdown, which seriously affects the life of the tundish and has certain safety hazards

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