A swirling flow upper nozzle for continuous casting tundish

Abstract

The invention discloses a vortex upper nozzle for a continuous casting tundish. The vortex upper nozzle comprises an upper nozzle body and one or more vortex grooves. The vortex grooves are formed inthe upper portion of the upper nozzle body. The vortex grooves are uniformly distributed in the circumferential direction. Each vortex groove has a certain depth and breadth and is through in inner and outer circular arcs of the upper surface of the upper nozzle body. Through the vertex upper nozzle, molten steel in the tundish nozzle can be made to rotate and flow to prevent the tundish nozzle from being blocked, and collision coagulation of inclusions of molten steel in the nozzle is facilitated. Accordingly, the inclusions can float upwards and are removed in a crystallizer. The phenomenonthat bias current is formed in a submerged nozzle can be reduced through application of a sliding nozzle, and asymmetrical fluctuation of the liquid level in the crystallizer is reduced. The vortex upper nozzle for the continuous casting tundish, provided by the invention, is simple in structure, convenient to install, low in cost and capable of being widely used under various technological conditions of plate billets, square billets, round billets and the like.

Description

technical field [0001] The invention belongs to the technical field of metal smelting and processing, and in particular relates to a swirling flow upper nozzle for a continuous casting tundish. Background technique [0002] In order to improve the production efficiency of steel, continuous casting technology is usually used in modern steel production. During the continuous casting process, the molten steel in the tundish enters the mold through the upper nozzle, the sliding nozzle, and the submerged nozzle. Using the stopper rod to cooperate with the upper nozzle of the tundish, the injection amount of molten steel from the tundish to the mold and the amount of molten steel in the mold can be controlled. The flow behavior of the inner molten steel plays a very important role in stabilizing the operation and ensuring the quality of the slab. [0003] The nozzle clogging phenomenon is prone to occur in the continuous casting production process of some steel types. The sensiti...

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Problems solved by technology

However, this kind of pneumatic swirling nozzle has a complicated manufacturing process due to the special air holes. In addition, the swirling speed of molten steel can only be controlled by adjusting the amount of gas blown in, and it is difficult to simultaneously produce the ideal swirl effect and ideal size. inert gas bubbles

(2) The utility model patent with the authorized announcement number "CN202479461U" discloses a submerged swirl nozzle for continuous casting. By setting a swirl guide groove in the submerged nozzle, a swirl movement is generated in the submerged nozzle. This It is beneficial to prevent the internal blockage of the submerged nozzle, but the processing cost of the inner cavity is relatively high, and has not been applied in actual production. At the same time, this type of nozzle cannot solve the problem of blockage of the upper nozzle of the tundish

However, due to the limited space at the nozzle position of the tundish, it is difficult to install the electromagnetic swirl device, and the installation, use and maintenance costs of the electromagnetic swirl device are high, so it has not been widely used in industrial production

[0009] Due to various factors, the above-mentioned various technologies and different types of nozzles cannot solve the problem of clogging of the tundish nozzle well, and some technologies cannot be widely used due to problems such as processing and manufacturing, use and maintenance costs.

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