Novel low-carbon low-silicon steel refining slag

Abstract

The invention discloses novel low-carbon low-silicon steel refining slag. Raw materials comprise lime, aluminum particles, fluorite, calcium carbide and magnesium carbonate. The chemical constituents of the refining slag comprise 0.45%-0.56% of TFe, 4.51%-4.52% of SiO2, 50.12%-54.15% of CaO, 9.32%-11.19% of MgO, 35.6%-36.1% of Al2O3, 0.12%-0.14% of MnO, 0.13%-0.15% of TiO2, 0.32%-0.46% of S, 0.015%-0.019% of P2O5 and the balance inevitable impurities. Compared with the prior art, the novel low-carbon low-silicon steel refining slag has the advantages of being low in cost and stable in product quality.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a novel low-carbon and low-silicon steel refining slag. Background technique [0002] Tinplate, also known as tinplate, is a tinplated steel product whose substrate is low-carbon low-silicon steel plate and steel strip. Tinplate is widely used in canning, packaging materials, stamping containers and other industries. The chemical composition, grain size, precipitation of solid-dissolved carbon and nitrogen, and flatness of the tinplate substrate are the main factors affecting the hardness and wrinkle resistance of the tinplate substrate; the tinplate (RGMR2) substrate is low-silicon and low-carbon steel. The composition requires that the carbon content is less than 0.04%, the silicon is less than 0.03%, the inclusions are controlled to be less than 0.04 / m2 through refining, and the particle size is less than 20μm. Refining slag in the refining process is the main method to...

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Problems solved by technology

The refining slag of the prior art has a high TFe content, the yield of molten steel is reduced, the slag is highly oxidizable, and the deoxidation is not sufficient, which is not conducive to the adsorption of inclusions, and the CaO / Al in the slag 2 o 3 High value is not conducive to Al 2 o 3 The adsorption of inclusions, if simply increase the Al 2 o 3 content, it will cause the fluidity of the slag to increase sharply, so that the SiO 2 +Al→Si+Al 2 o 3 The reaction is obviously accelerated, and the Si increase in the steel is serious, so it cannot be used in low-carbon and low-silicon steel

At the same time, the MgO content is low, and the molten steel severely corrodes the refractory material of the ladle, resulting in an increase in the total oxygen content and excessive inclusions in the steel when producing tinplate substrate steel. Simply increasing MgO will increase the viscosity of the slag, thereby reducing the fluidity of the slag. It is conducive to the floating of inclusions, so it cannot be applied in low-carbon and low-silicon steel

At the same time, due to the large amount of calcium carbide, the refining process increases C by 0.018%, and the converter is forced to reduce the C content at the end point, which increases the blowing loss of the steel converter and increases the production cost.

The above existing problems seriously affect the qualified rate of products and cause economic losses to enterprises

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