Production method of ultralow-carbon low-aluminum structural molten steel

Abstract

The invention discloses a production method of ultralow-carbon low-aluminum structural molten steel, and mainly solves the technical problems of low chemical component control precision and high production cost in the existing production process of the ultralow-carbon low-aluminum structural molten steel. According to the technical scheme, the production method of the ultralow-carbon low-aluminum structural molten steel comprises the following steps that (1) molten iron is desulfurized; (2) smelting is achieved by adopting a top-bottom combined blowing converter; a converter smelting end point is controlled, and w [C] and temperature in the molten steel at a converter blowing end point are detected; and tapping is achieved immediately after the converter blowing is finished; (3) the molten steel in a steel ladle is transported to an argon blowing station to regulate and control the temperature of the molten steel; and (4) the molten steel in the steel ladle is conveyed to an RH furnace for refining treatment, and vacuum decarburization, deoxidation alloying and circulation nitrogen increasing are conducted on the molten steel. According to the production method of the ultralow-carbon low-aluminum structural molten steel, accurate control over the chemical components of ultralow-carbon low-aluminum structural steel is achieved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a production method of structural steel, in particular to a production method of ultra-low carbon and low aluminum structural molten steel, and belongs to the technical field of steel smelting and continuous casting. Background technique [0002] Ultra-low-carbon and low-aluminum structural steel is mainly used for heat sinks made of steel-aluminum composite panels, the main chamber of automobile engine radiator boxes, composite inner tanks of electric rice cookers, etc. The products are required to have the characteristics of good thermal conductivity, corrosion resistance, and light weight. , the precise control of oxygen-enriched content and carbon content required by this type of steel requires a nitrogen-increasing process for molten steel. [0003] Chemical composition weight percent of ultra-low carbon and low aluminum structural steel: C: 0.0025~0.0080%, Si≤0.01%, Mn: 0.20~0.32%, P≤0.015%, S≤0.004%, Alt≤0.005%, N: 0.003...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a production method of ultra-low-carbon and low-aluminum structural molten steel, which mainly solves the technical problems of low chemical composition control precision and high production cost in the production process of existing ultra-low-carbon and low-aluminum structural molten steel; the method of the present invention thoroughly It solves the problems of fluctuating carbon content in oxygen-containing molten steel, inaccurate control of free oxygen after deoxidation after aluminum addition, unstable yield of nitrogen-increased nitrogen by circulating nitrogen, and high production cost of molten steel in the vacuum treatment process of RH furnace

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