Production method of low-aluminum carbon structural molten steel

Abstract

The invention discloses a production method of low-aluminum carbon structural molten steel. The production method mainly solves the technical problems that existing carbon structural steel produced by a slab continuous casting machine is poor in cleanliness and high in deoxidation cost. According to the technical scheme, the production method of the low-aluminum carbon structural molten steel comprises the following steps that a top-bottom combined blowing converter is adopted for smelting, and 80%-100% of molten iron is added by mass percent; controlling a converter smelting end point, and detecting w [C] and molten steel temperature in molten steel at the converter smelting end point; tapping immediately after converter blowing is finished, and blowing argon at the bottom of a steel ladle in the converter tapping process; molten steel in the steel ladle is conveyed to an argon blowing station for molten steel temperature regulation and final deoxidation; and carrying out weak stirring on the molten steel fed with the aluminum wire. The low-aluminum carbon structural steel produced by the method disclosed by the invention is low in deoxidation cost, and the deoxidation cost per ton of steel is reduced by 12-22 yuan; and the cleanliness of the steel is high, and the total oxygen weight content in tundish molten steel is 0.0015-0.0025%.

Description

technical field [0001] The invention relates to a production method of carbon structural steel, in particular to a production method of low-aluminum carbon structural molten steel, which belongs to the technical field of steel smelting and continuous casting. Background technique [0002] Carbon structural steel has high strength, good plasticity and toughness, and can be welded. It is generally used to build factory building frames, high-voltage transmission towers, bridges and containers, and can also be used to manufacture mechanical connecting rods, couplings, and gears. And pin parts, the market demand has always been great. According to the different deoxidation methods of steelmaking, carbon structural steel can be divided into semi-killed steel and killed steel. In the prior art, when the slab continuous casting machine produces carbon structural steel, molten steel is often deoxidized by aluminum to obtain killed steel. The treatment process is as follows: during ...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of production method of low-aluminum carbon structural steel molten steel, mainly solve the technical problem that the cleanliness of existing carbon structural steel produced with slab continuous casting machine is poor and the cost of deoxidation is high; The inventive method has improved The cleanliness of low-aluminum carbon structural steel reduces the deoxidation cost of low-aluminum carbon structural steel

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