A method for adjusting the flow rate of argon gas in the tundish

Abstract

Provided is a method for adjusting tundish argon flow. The original mode of fixing the flow of blown argon through a water feeding opening of tundish is changed into the mode of dynamically adjusting the flow of the blown argon according to the change of the weight of tundish molten steel, the liquid level of the tundish molten steel is prevented from being exposed, the cleanliness of the tundish molten steel is guaranteed, fluctuation of the liquid level of the molten steel in a crystallizer is reduced, and therefore the quality of a casting blank is improved. Compared with the prior art, the method has the advantages that the liquid level of the tundish is prevented from being exposed or splashed, the fluctuation of the liquid level of the crystallizer is reduced, and therefore the cleanness of the molten steel is improved, and the quality of the casting blank is improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for adjusting the flow rate of argon gas in a tundish. Background technique [0002] The continuous casting tundish is used as a buffer link in the continuous casting process, and the smooth pouring of molten steel into the crystallizer mainly depends on the static pressure generated by the gravity of the molten steel in the tundish. In the process of replacing the large tank, the weight of the molten steel in the tundish continues to decrease from the end of the pouring of the previous tank to the start of the pouring of the next tank, resulting in a continuous decrease in the liquid level of the molten steel in the tundish, and a continuous decrease in the static pressure of the molten steel , and the argon gas flow rate at the upper nozzle of the tundish is a set value, then under the action of argon gas, the replenishment of molten steel to the crystallize...

AI Technical Summary

Problems solved by technology

In the process of replacing the large tank, the weight of the molten steel in the tundish continues to decrease from the end of the pouring of the previous tank to the start of the pouring of the next tank, resulting in a continuous decrease in the liquid level of the molten steel in the tundish, and a continuous decrease in the static pressure of the molten steel , and the argon gas flow rate at the upper nozzle of the tundish is a set value, then under the action of argon gas, the replenishment of molten steel to the crystallizer is insufficient, which will lead to the opening of the flow control device (slide plate or stopper rod flow control) There is a large fluctuation in the degree, which leads to an increase in the fluctuation of the crystallizer liquid level

In addition, the continuous reduction of the liquid level in the tundish will cause the liquid surface to splash and expose under the action of argon gas, which will seriously affect the cleanliness of molten steel and affect the quality of casting slabs

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