Continuous casting anti-blocking submersed nozzle

Abstract

The invention provides a continuous casting anti-blocking submersed nozzle which comprises a nozzle body. An inner cavity of the nozzle body is cylindrical, and an inlet of the nozzle body is formed in the top of the nozzle body. A nozzle slag line is arranged in the middle of the nozzle body, and two discharging holes are symmetrically formed in the side wall, close to the bottom of the nozzle body, of the nozzle body. The discharging holes are inclined downwards from the inside to the outside of the nozzle body. The continuous casting anti-blocking submersed nozzle can be widely used for a continuous casting steel production procedure, secondary oxidation of molten steel is reduced, and stable and continuous casting is achieved. In order to improve the corrosion resistance of the slag line, corrosion-resistant BN is added to the slag line of the nozzle, and produced corrosion products cannot pollute the molten steel and cannot be caked. Argon is blown into the nozzle, and caking is avoided.

Description

technical field [0001] The invention belongs to the application field of continuous casting equipment in continuous casting steel machinery, in particular to a submerged nozzle device used in the process of continuous casting steel pouring. Background technique [0002] In the prior art, many patent applications such as CN200720010304.1 and CN201520044016.2 have disclosed the structure of the continuous casting submerged nozzle. [0003] In the continuous casting process, the role of the submerged nozzle is to isolate the air and prevent oxidation, and the submerged nozzle plays the role of introducing molten steel from the tundish into the mold. In this process, the following problems are usually encountered: ① During the baking of the nozzle, due to the presence of graphite inside the nozzle, carbon oxidation will occur after baking, resulting in a decrease in the strength of the nozzle material; When the slag is under the bottom, it is easy to fall off. ②During use, due...

AI Technical Summary

Problems solved by technology

In this process, the following problems are usually encountered: ① During the baking of the nozzle, due to the presence of graphite inside the nozzle, carbon oxidation will occur after baking, resulting in a decrease in the strength of the nozzle material; When the slag under the bottom is prone to fall off

②During use, due to the physical and chemical reaction between the slag line position of the nozzle and the mold slag inside the crystallizer, the line binding position is easily corroded, which may seriously cause the slag line to break

③ Due to the inevitable existence of oxidation inclusions in molten steel, nodulation products are produced inside the nozzle, which affects the flow of molten steel, causes bias current vibration, and also affects the service strength of the nozzle

The nodulation problem on the inner wall of the nozzle has not yet found a suitable solution

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