Single-point unbalanced protection casting device for ultra-thin large-size aluminum-containing steel profiled blank and using method thereof

Abstract

The invention discloses a single-point unbalanced protection casting device for an ultra-thin large-size aluminum-containing steel profiled blank and a using method thereof, and belongs to the technical field of near-net shape continuous casting in the iron and steel metallurgy industry. The single-point unbalanced protection casting device comprises a tundish, a stopper rod, an upper nozzle, a seat brick, a lower nozzle, a submerged nozzle and an H-shaped blank crystallizer; the stopper rod is arranged at an outlet of the tundish; the outlet of the tundish is provided with the upper nozzle and is fixed by the seat brick; the lower end of the upper nozzle is connected with the lower nozzle; the lower end of the lower nozzle is connected with the submerged nozzle; and the submerged nozzle is positioned at the center of a triangular area of a lateral flange of the H-shaped blank crystallizer. The single-point unbalanced protection casting device further comprises a hollow blowing sleevearranged between the upper nozzle and the lower nozzle; the upper nozzle, the sleeve and the lower nozzle form a steel flow channel; the sleeve is provided with air inlets; the number of the air inlets is more than one; and the air inlets communicate with steel flow channel. The quality of a special-shaped blank product can be improved, the yield of casting blanks is increased, the competitivenessof the product in the market is improved, and the single-point unbalanced protection casting device has the advantages of reasonable design and easiness in application.

Description

technical field [0001] The invention belongs to the technical field of near-net-shape continuous casting in the iron and steel metallurgy industry, and more specifically relates to a single-point unbalanced protective casting device for ultra-thin and large-size aluminum-containing steel profile blanks and a use method thereof. Background technique [0002] Continuous casting is a process of continuous cooling and solidification of molten steel, which is currently the main method of steel casting. In the development process of continuous casting technology, near-net shape continuous casting is an important achievement and symbol of the development of modern continuous casting technology. It can directly produce continuous casting slabs with the required cross-sectional shape of steel or close to the shape of finished steel. Among them, continuous casting of shaped billets is an important form of near-net shape continuous casting, and shaped billets usually mainly refer to co...

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Problems solved by technology

[0015] Aiming at the problem of safe and stable casting of ultra-thin and large-size aluminum-containing steel profile billets in the prior art, the present invention provides a single-point unbalanced protective casting device for ultra-thin large-size aluminum-containing steel profile billets, which solves the problem of flange The molten steel flow field and temperature field of the mold in single-point unbalanced casting are asymmetrical and uneven, the growth of the slab shell in the mold, and the melting of mold slag are uneven, which may easily lead to production accidents such as steel breakout and pull failure, and the casting slab In the case of surface crack quality problems, the quality control level of profiled billet products can be further improved, and it also lays a solid foundation for realizing the safe and stable production of ultra-thin webs, super-large cross-sections, and steels containing easily oxidized elements such as aluminum in large quantities for profiled billet continuous casting machines. Base

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