Pinwheel-shaped and tree root-shaped quarter section tangential water gap for continuous casting

Abstract

The invention discloses a pinwheel-shaped and tree root-shaped quarter section tangential water gap for continuous casting and belongs to the technical field of continuous casting. Peripheral lines of four side holes of the water gap is tangential to a centre hole of the water gap, and the four side holes form a downward slant angle alpha in an orifice direction, wherein alpha is 10 to 25 degrees; and when used for casting, the quarter section tangential water gap needs to be immersed in a certain depth h below the liquid steel level, wherein h is 100 to 130mm. The product has the advantages of simple structure, easy processing and production, and contribution to reducing the production cost of a casting blank; when the water gap is used for casting, the liquid steel in a crystallizer not only forms upper reflux and lower reflux, but also forms a strong horizontal whirlpool, so that the water gap contributes to reducing the impact depth of the liquid steel, promoting inward agglomeration and growth of impurities and bubbles and upward flotation, restraining liquid level fluctuation and removing a dead zone of the liquid steel below a crescent moon surface; and the impact area range of the side holes of the water gap is reduced to a certain extent, the impact degree of the liquid steel is lightened, and the formed horizontal whirlpool can enable the shell thickness of the casting blank to be distributed on the cross section of the crystallizer uniformly and circumferentially.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a submerged nozzle for continuous casting crystallizers of large-section billets, rectangular billets and round billets. Background technique [0002] At present, many high-end steel types need to be produced by large-section billet, rectangular billet and round billet continuous casting machines, such as ball bearing steel, high-carbon hard wire steel, cold heading steel wire rod, free-cutting steel, etc. Mold is one of the most critical equipment of continuous casting machine. Its internal molten steel flow form, temperature field distribution, free liquid surface fluctuation state, primary billet shell growth and inclusion floating state all directly affect the quality of casting billet. . However, at present, straight-through nozzles are still mostly used for casting large-section billets, rectangular billets and round billets. Under this working condition, high-te...

AI Technical Summary

Problems solved by technology

However, this technology needs to modify the existing device. If it is necessary to adjust the distance between the tundish and the crystallizer for installation and maintenance, it is also necessary to add a fixing device to the original equipment to fix the electromagnetic device, etc.

In addition, there are also cost issues such as the above-mentioned electromagnetic stirring repair and maintenance.

Images