Pouring basket with molten steel purity stably improved under low argon consumption and metallurgical method thereof

Abstract

The invention provides a pouring basket with molten steel purity stably improved under low argon consumption. Through the arrangement of a barrier wall, a gas-curtain brick and a short dam and position points thereof, the purity of molten steel for the metallurgy of the pouring basket can be effectively improved. The invention also provides a metallurgical method of the pouring basket. The method comprises the following steps of: in a pouring process, when the weight of the molten steel of the pouring basket reaches 12 tons, trigging an automatic argon regulating system, wherein the regulating goal is an argon flow from 50 L/min to 150 L/min and an argon pressure from 0.05 Mpa to 0.25 Mpa. With the pouring basket and the metallurgical method provided by the invention, the molten steel purity of the pouring basket can be stably improved under the situation of low argon consumption; and total oxygen content is lower than 30 ppm, which is superior to the prior art.

Description

technical field [0001] The invention relates to the field of continuous casting of stainless steel, in particular to a tundish metallurgical method and a corresponding device capable of stably improving the purity of molten stainless steel under the condition of relatively low argon consumption. Background technique [0002] At present, the product quality of stainless steel is mainly the cleanliness and surface quality of steel, among which the outstanding problem is the removal and control of inclusions. The existence of inclusions not only seriously affects the internal and surface quality of stainless steel, but also reduces the corrosion resistance of stainless steel products. At present, the scrap rate of products caused by inclusions in domestic stainless steel factories is as high as 20%. Therefore, the cleaning technology centered on inclusion control in the stainless steel production process has attracted more and more attention. [0003] In recent years, users ha...

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Problems solved by technology

This scheme only describes the size of the air curtain bricks in the tundish and the argon flow and pressure before and during the pouring process, which is similar to Chinese patent application 200910062737.5. This scheme does not involve the cooperation between the air curtain bricks and other dams in the tundish The problem does not involve the adjustment of argon blowing parameters during the unsteady pouring process that is common in production, nor does it involve the description of reducing argon consumption

[0009] The above-mentioned patents or applications on the use of argon gas treatment in the tundish to purify molten steel only describe the method of argon gas treatment for a single tundish air curtain brick, without considering the presence of slag retaining walls, dams, Weir and other functional refractory materials, the types of these refractory materials and the different arrangements and types of air curtain bricks will greatly affect the effect of purifying molten steel by argon treatment in the tundish; secondly, the continuous casting process is An unsteady process, the height of molten steel in the tundish will fluctuate with the matching of the production rhythm. If the same pressure and flow settings are used, the argon blowing effect will not be obvious when the liquid level in the tundish is high. In the case of low liquid level, the liquid level will be overturned, and the secondary oxidation of molten steel will be serious, which will increase the total amount of inclusions; thirdly, due to the characteristics of argon gas preparation, it is destined that argon gas will be better than nitrogen and other gases. The price of the tundish is expensive, and the tundish needs to be baked for a long time (generally more than 3 hours) before pouring. The maximum temperature of the lining can reach above 1100°C. The embedded air curtain brick connecting pipe can be cooled without ventilation. It will be melted very quickly, and the effect of argon blowing in the subsequent pouring process will no longer exist, and the whole process of argon blowing and cooling during the baking process will greatly affect the production cost, resulting in the infeasibility of the argon blowing process in the tundish

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