A method for reducing flocculation of low-silicon aluminum-killed steel

Abstract

The invention provides a method for reducing flocculating flows of low silicon aluminum killed steel. The method comprises the following steps of: covering a ladle by using lime after the slagging-off of molten steel; before the primary sampling of a ladle furnace (LF), adding a proper amount of fluorite, a proper amount of bauxite and a proper amount of lime, and stirring the mixture by adopting strong argon, and after the primary sampling, adding passivated aluminum powder for deoxidization, heating and slagging the mixture, supplementing the lime and keeping the temperature of the molten steel; performing regulation by adopting an aluminum wire according to the weight of Als in a primary sample, and stirring the mixture by adopting the strong argon; after wire feeding, stirring the mixture by adopting weak argon, and controlling the proportion of [Ca] to the [Als] in the steel; controlling the argon blowing amount of an upper nozzle of a tundish, and keeping the molten steel pouring liquid level of the tundish to be more than or equal to 500mm; and finishing weak argon blowing over the ladle in front of a machine halfway through the pouring of the ladle. By the method, the flocculating flow phenomena of the molten steel can be effectively controlled, and are reduced from 11 to 18 per pouring to 0 to 1 per pouring to realize no flocculating flow in the continuous pouring of more than 15 ladles of the low silicon aluminum killed steel, the productivity of equipment is greatly improved, the quality of the product is greatly improved, and pouring interrupt accidents can be reduced.

Description

technical field [0001] The invention belongs to the field of smelting technology, and in particular relates to a method for reducing floc flow of low-silicon-aluminum killed steel in the production process of squares and slabs. Background technique [0002] In the production process of square and slab low-silicon aluminum-killed steel, due to the low silicon content in the steel, it completely depends on aluminum deoxidation, so the acid-soluble aluminum content is high, which can easily cause the secondary oxidation of molten steel to form aluminum oxide flocs During the pouring process, the fluidity of molten steel is reduced, and it is easy to adhere to the nozzle, resulting in flocculation, which not only limits the number of continuous pouring, directly affects the normal progress of molten steel casting, but also leads to a decline in production capacity and product quality, seriously Sometimes even lead to water failure accidents, resulting in great economic losses. ...

AI Technical Summary

Problems solved by technology

[0002] In the production process of square and slab low-silicon aluminum-killed steel, due to the low silicon content in the steel, it completely relies on aluminum deoxidation, so the acid-soluble aluminum content is high, which easily causes the secondary oxidation of molten steel to form Al2O3 flocculent During the pouring process, the fluidity of molten steel is reduced, and it is easy to adhere to the nozzle, resulting in flocculation, which not only limits the number of continuous pouring, directly affects the normal progress of molten steel casting, but also leads to a decline in production capacity and product quality, seriously Sometimes even lead to outage accidents, resulting in great economic losses