Low-cost calcium treatment method of ultralow-carbon high-aluminum steel

Abstract

The invention discloses a low-cost calcium treatment method of ultralow-carbon high-aluminum steel. The technical problems of high cost, molten steel splashing and molten steel nitrogen increasing ofthe calcium treatment conducting on the ultralow-carbon high-aluminum steel by an RH furnace in the prior art are solved. According to the technical scheme, the low-cost calcium treatment method for the ultralow-carbon high-aluminum steel comprises the following steps that decarbonizing is conducted on molten steel; deoxidizing is conducted the decarburized molten steel by adopting silicon; controlling a molten steel treatment mode of the RH furnace to be switched into a light treatment mode; conducting the calcium treatment on the molten steel; introducing argon into a RH furnace circulationpipe before the RH furnace finishes the next-furnace molten steel treatment, circulating the argon in the RH furnace circulation pipe, and the argon circulating flow rate is 500-2400 L / min. Accordingto the method, the cost for conducting the calcium treatment on the ultralow-carbon high-aluminum steel in the RH furnace is reduced, and the production cost of the ultralow-carbon high-aluminum steelis reduced.

Description

technical field [0001] The invention relates to a calcium treatment process for molten steel, in particular to a low-cost calcium treatment method for ultra-low-carbon high-aluminum steel, and belongs to the technical field of steelmaking processes. Background technique [0002] When casting aluminum-killed steel in steelmaking, especially ultra-low carbon high-alumina steel with a carbon content of 0.001-0.01% and an aluminum content of 0.1-0.3%, solid Al 2 o 3 At the same time, aluminum in molten steel is easy to be oxidized again, forming high-melting point oxides, resulting in nodulation of stopper rods and nozzles, affecting production rhythm and deteriorating the purity of molten steel. [0003] The RH vacuum degassing refining method is a vacuum molten steel circulation degassing method jointly developed by Ruhrstahl and Heraeus, which belong to Tyssen (Thyssen) in West Germany. The RH vacuum degassing refining method is named after the two companies, which can make...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a low-cost calcium treatment method for ultra-low-carbon high-aluminum steel, which mainly solves the high cost, splashing of molten steel and increase of molten steel in the prior art for ultra-low-carbon high-aluminum steel with RH furnace. The technical problem of nitrogen; the method of the present invention thoroughly solves the industry problems of molten steel splashing and violent tumbling of molten steel when the RH furnace carries out calcium treatment on ultra-low carbon high-aluminum steel, and avoids the multiple follow-up treatment furnaces of cold steel produced by molten steel splashing Nitrogen increase of secondary molten steel, production equipment accident caused by molten steel splashing and burning RH furnace equipment, reduced the cost of calcium treatment of ultra-low carbon high aluminum steel in RH furnace

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