Square billet hyperbolic-type submersed nozzle and manufacturing method thereof

A hyperbolic and production method technology, which is applied in the direction of manufacturing tools, casting molten material containers, metal processing equipment, etc., can solve the problem of reducing the proportion of the lower part of the nozzle, discontinuous inflow of liquid mold slag, and increasing the impact depth of the mold, etc. problems, to achieve the effect of improving the flow behavior of molten steel, avoiding the vacuum effect, and improving the internal and external quality
CN110170641AActive Publication Date: 2019-08-27GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
Publication Date
2019-08-27

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Abstract

The invention belongs to the technical field of square billet continuous casting production and discloses a square billet hyperbolic-type submersed nozzle and a manufacturing method thereof. The method comprises the steps including designing of a hyperbolic-type nozzle; counterboring; tool machining; machining of the hyperbolic-type nozzle; spraying and the like. According to the method, by designing the shape of an internal hyperbolic-type channel of the nozzle, by means of the characteristic that the upper curvilinear section areas are gradually decreased, the volume proportion of a cavity in the upper portion of the nozzle is controlled, and the tendency that gas suction of the nozzle causes secondary oxidation is reduced; and by means of the characteristic that the lower curvilinear section areas are gradually increased, steel flow flows downwards in a dispersed mode, the impact depth in a crystallizer of molten steel is decreased, and the flow behavior of the molten steel in the crystallizer can be improved easily. According to the square billet hyperbolic-type submersed nozzle and the manufacturing method thereof, the portion, in the hyperbolic top position, of the channel ismachined into a ring shape, backflow formed after multiple times of reducing of the steel flow is mainly used for disturbing a center flow, the flowing speed of the center flow is decreased, and thesteel flow is controlled to decelerate on the whole.
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Description

technical field

[0001] The invention relates to the technical field of billet continuous casting production, in particular to a billet hyperbolic submerged nozzle and a manufacturing method thereof. Background technique

[0002] In the process of continuous steel casting, the flow characteristics of the fluid in the mold are not only related to the heat transfer of the mold and the floating of inclusions, but also have a very close relationship with the surface and internal quality of the slab. The submerged nozzle is the channel for molten steel to enter the mold from the tundish. It not only protects the steel flow and prevents secondary oxidation of the molten steel, but also changes the flow state of the molten steel in the mold. The submerged nozzle with a reasonable structure makes the The impact depth of molten steel decreases, which promotes the floating of inclusions in the crystallizer, and moves the high temperature zone upward, which is beneficial to the uniform ...

Claims

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