Multi-hole continuous-casting submersed nozzle for square and round billets

Abstract

The invention belongs to the technical field of continuous casting of steel and particularly relates to a multi-hole submersed nozzle device for a continuous casting crystallizer of square and round billets. The multi-hole submersed nozzle device comprises a nozzle body, wherein the nozzle body is surrounded by a side wall and a sealed base plate, and the upper end of the nozzle body is opened; a vertical inner cavity is defined by the body; side holes penetrating through the side wall are formed in the parts, close to the upper part of the base plate, of the side wall; a boss protruding towards the inner cavity is arranged at the center of the upper surface of the base plate; and an annular gap capable of changing a linear flow manner of liquid steel into an annular flow manner is defined between the boss and the side wall; and a plurality of side holes are uniformly formed in the side wall higher than the upper surface of the base plate and lower or equal to the upper surface of the boss. According to a multi-hole continuous-casting submersed nozzle, the poured liquid steel can flow uniformly and stably out from the side holes, so that the uniform temperature field and flow field of the crystallizer can be transversely maintained, and the impact of the liquid steel on primarily-generated solidified billet housings at the wall surface of the crystallizer can be further lightened so as to facilitate the reasonable solidification and the quality improvement of the casting billets.

Description

technical field [0001] The invention relates to the technical field of continuous casting of steel, in particular to a porous submerged nozzle device for continuous casting crystallizers of billet and round billet. Background technique [0002] The submerged nozzle is a commonly used device in the field of metallurgy. Its main function is to prevent secondary oxidation, nitriding, and splashing of molten steel, while avoiding slag entrainment on the liquid surface, and adjusting the flow pattern and temperature distribution of molten steel in the mold, thereby promoting The billet shell in the crystallizer grows evenly without defects, and minimizes the gas and non-metallic inclusions in the molten steel. Because the submerged nozzle has a significant effect on improving the quality of the slab, improving the working conditions, stabilizing the continuous casting operation and preventing the surface and internal quality defects of the slab, it is widely used in continuous ca...

AI Technical Summary

Problems solved by technology

Therefore, this design method cannot well distribute the flow of molten steel at the outlet and reduce the impact and damage of molten steel on the billet shell

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