Continuous casting mould powder for high-aluminium steel, and preparation method thereof

Abstract

The invention discloses continuous casting mould powder for high-aluminium steel, and a preparation method thereof. The continuous casting mould powder for high-aluminium steel is prepared through taking calcium aluminate, limestone, bauxite, lithium carbonate, barium carbonate, strontium carbonate, magnesia, sodium carbonate and a carbonaceous material as raw materials, and comprises the following composition element components in percentage by weight: 30-45% of calcium oxide CaO, 20-30% of aluminium oxide Al2O3, not greater than 3% of silicon dioxide SiO2, 3-8% of lithium oxide LiO2, 1-3% of strontium oxide SrO, 5-10% of sodium oxide NaO2, 3-6% of barium oxide BaO, not greater than 3% of magnesium oxide MgO, 2-4% of carbon C, not greater than 2% of fluorine F and the balance impurities. The continuous casting mould powder for high-aluminium steel, which is disclosed by the invention, suppresses the abovementioned elements with strong reducing property from being oxidized and then entering slag to denature the slag, and achieves the purpose of continuous casting of steel containing Al, Ti and elements with strong reducing property, such as rare-earth elements, thus smooth continuous casting of the steel is ensured, and good surface quality of casting blanks is achieved.

Description

technical field [0001] The invention relates to an auxiliary material for steelmaking and continuous casting and a preparation method thereof, in particular to a continuous casting flux for high-alumina steel and a preparation method thereof. Background technique [0002] During the continuous casting of molten steel, mold slag needs to be continuously added to the molten steel surface in the continuous casting mold. The molten mold slag continuously flows between the slab and the mold with the vibration of the mold to lubricate and control heat transfer. The slag isolates the air to avoid the oxidation of molten steel; the unmelted solid slag has a thermal insulation effect on the molten steel; the molten slag also absorbs inclusions such as alumina in the molten steel. The main chemical components of traditional mold slag are CaO, SiO2, Al2O3, etc. Then basic carbonate and fluoride are added to adjust the melting point and viscosity, and carbonaceous materials are added to...

AI Technical Summary

Problems solved by technology

Due to the low silica, poor glass property, high melting temperature and large amount of co-solvent added, especially the increased amount of fluorine will pollute the environment and corrode equipment.

[0006] On the other hand, in order to reduce the silica content in the mold flux, many patents have increased the fluorine content in the mold flux. Performance, the fluorine content in the slag has reached more than 6%, which will greatly increase the pollution of equipment corrosion, cooling water and air

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