RH refining method for reducing total oxygen content of ultra-low carbon steel tundish

Abstract

The invention relates to an RH refining method for reducing the total oxygen content of an ultra-low carbon steel tundish and belongs to the technical field of continuous casting. The RH refining method comprises the steps that aluminum is added in converter molten steel after decarbonizing and/or degassing treatment to perform deoxidizing treatment, maintaining is performed for at least 3 minutes, and then a silicon-containing metal is added in to obtain the refined molten steel; and in percentage by mass and in part per million concentration, the silicon content in the refined molten steel is 90-110 ppm, the [Si] content in liquid steel is increased, the fact that RH is finished to the tundish pouring process is achieved, when the molten steel comes in contact with air, combination of Aland oxygen is reduced to generate Al2O3, so that the method for reducing the tundish oxygen content is achieved, the fact that the oxygen content in the refined molten steel is less than or equal to10 ppm is achieved, and the RH refining method for reducing the total oxygen content of the ultra-low carbon steel tundish has the effects of purifying the molten steel and avoiding nozzle blocking.

Description

technical field [0001] The invention relates to an RH refining method for reducing the total oxygen content of an ultra-low carbon steel tundish, and belongs to the technical field of refining. Background technique [0002] When casting ultra-low carbon steel (C<0.0030%) by converter-RH refining-continuous casting production process, aluminum is generally used to deoxidize molten steel during the RH refining process, and aluminum and molten steel oxygen form Al 2 o 3 Inclusions, in the later stage of sedation and casting process although small particles of Al 2 o 3 Inclusion-like inclusions are easy to collide and aggregate to grow up and be removed by floating, but there is still a part of Al 2 o 3 The existence of such inclusions in molten steel, on the one hand, affects the purity of molten steel, thereby affecting the quality of ultra-low carbon steel billets; It will affect the number of continuous casting furnaces in the tundish and the castability of ultra-low...

AI Technical Summary

Problems solved by technology

[0002] When casting ultra-low carbon steel (C2 o 3 Inclusions, in the later stage of sedation and casting process although small particles of Al 2 o 3 Inclusion-like inclusions are easy to collide and aggregate to grow up and be removed by floating, but there is still a part of Al 2 o 3 The existence of such inclusions in molten steel, on the one hand, affects the purity of molten steel, thereby affecting the quality of ultra-low carbon steel billets; It will affect the number of continuous casting furnaces in the tundish and the castability of ultra-low carbon steel in the steelmaking process, thereby affecting the production efficiency and quality of ultra-low carbon steel billets