Submerged nozzle for special-shaped blank casting and arrangement mode thereof

Abstract

The invention discloses a submerged nozzle for special-shaped blank casting and an arrangement mode thereof. The submerged nozzle is annular, and a side wall with a hollow inner cavity is formed. A circular first opening is formed in the upper end face of the side wall, and a T-shaped second opening is formed in the lower end face of the side wall. A vertical part and a horizontal part which is connected with the middle of the vertical part are arranged on the edge of the second opening, the center of the circle of the first opening and the center of the second opening are both placed on the axis of the side wall, and the area of the first opening is equal to the area of the second opening. The hollow inner cavity is formed by correspondingly extending to the edge of the second opening from the edge of the first opening in the quasi-generatrix direction in a cut-through mode. According to the scheme, a stable and even flow field can be formed in a crystallizer, particularly the temperature and component uniformity in the transverse direction of the heat center of molten steel and the cross section of the crystallizer are improved, floating removal of nonmetallic inclusion in the molten steel and primary blank shell growth can be facilitated, and casting blank texture and surface quality are improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and belongs to the billet casting process, in particular to a submerged nozzle device for casting a special-shaped billet and its arrangement. Background technique [0002] Continuous steel casting is a technology that continuously condenses molten steel into billets. The molten steel in the tundish is continuously poured into the crystallizer through the nozzle made of refractory material, and after cooling, the cast slab is formed. The submerged nozzle can isolate the molten steel from the air, prevent the secondary oxidation of the molten steel during the casting process, and improve the purity of the molten steel; the reasonable design of the nozzle and the arrangement of the nozzle can obtain a stable and uniform mold flow field, In order to ensure the normal growth of the primary shell, and promote the rapid floating of inclusions in molten steel, to achieve continuous and low-cost prod...

AI Technical Summary

Problems solved by technology

However, since the size of the profiled blank is generally small at present, setting three water holes at the bottom of the submerged nozzle makes the distance between each water hole smaller, reduces the service life of the nozzle, and leads to higher production costs

Another shortcoming of this invention is that the bottom of the submerged nozzle is closed, and there is a certain distance between the lower wall surface of each water hole on the side wall and the bottom surface of the nozzle. When replacing the nozzle, part of the molten steel still remains in the nozzle, which is prone to burn people. major safety accidents

[0007] Based on the above reasons, it is difficult to meet the requirements of low cost and stable production in the production process of special-shaped billets under the prior art.

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