RH decarburization method during ultra-low-carbon steel production process by revolving furnace

Abstract

The invention relates to an RH decarburization treatment method in the process of producing ultra low carbon steel by a converter, and belongs to the technical field of ferrous metallurgy. The technical problem to be solved by the invention is that an RH insert tube is prevented from sticking slag in the process of producing the ultra low carbon steel by the converter process. The technical proposal is as follows: chemical compositions of ladle slag in the process of the RH decarburization treatment of the ultra low carbon steel are controlled as follows based on the weight percentages: 5.0-11.0% of SiO2, 40.0-48.0% of CaO, 7.5-15.0% of Al2O3, 7.5-12.0% of MgO, 20.0% of FeO, 7.0% of MnO, Fe2O3, CaF2 and micro constituents such as S, P, TiO2 and the like, thus improving the CaO / Al2O3 ratio and the (CaO / SiO2) / Al2O3 ratio, effectively inhibiting the separation of high-melting point phase of the ladle slag, reducing the melting point and the viscosity of the ladle slag, enhancing the flowability of the ladle slag, lightening the slag sticking of the RH insert tube and increasing the number of furnaces to be continuously treated without slag removal.

Description

technical field [0001] The invention relates to a RH decarburization treatment method in the process of producing ultra-low carbon steel by a converter, which can effectively prevent slag sticking to RH insertion pipes in the process of producing ultra-low carbon steel by the converter process, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] RH vacuum treatment technology is an important means of refining outside the furnace to produce high-quality steel. At present, the production lines of many converter steelmaking plants in the world are equipped with RH refining furnaces, and this equipment is often used to decarburize ultra-low carbon steels including IF steels. In the production of IF steel or other ultra-low carbon steel, serious slag sticking phenomenon often occurs in the insertion pipe, which causes the insertion pipe to become thicker and larger, and the clearance of the ladle decreases during RH treatment, which affe...

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Problems solved by technology

[0013] The problem to be solved by the present invention is to overcome the problem of slag sticking in the RH insertion tube during the production of ultra-low carbon steel by the converter process

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