Ultra-low carbon crystallizer casting powder for continuous casting of automobile sheet and preparation method of ultra-low carbon crystallizer casting powder

Abstract

The invention discloses ultra-low carbon crystallizer casting powder for continuous casting of an automobile sheet. The ultra-low carbon crystallizer casting powder comprises the following chemical components: 33%<CaO<41%, 35.5%< SiO2<43.5%, 1%<Al2O3< 6.0%, 0<MgO< 4%, 0<Fe2O3< 3%, 3.5%< F<->< 9.5%, 1.5%< R2O< 7.5%, 1.0%< C< 3%, and the balance of impurities. The preparation method comprises the following steps: weighing the raw materials, carrying out mixing granulation, melting in an electric furnace, and carrying out air cooling to obtain a pre-melting material; crushing and grinding the pre-melting material, adding a carbonaceous material, adding normal-temperature water and a binder into a ball mill, and performing fine grinding to obtain slurry; and feeding the slurry into a spray particle drying tower for spray granulation and drying. According to the ultra-low carbon crystallizer casting powder and the preparation method, the occurrence rate of recesses and slag inclusion on thesurface of the casting blank is reduced while improving casting blank lubrication, molten steel or the casting blank is prevented from being recarburized by casting powder, the surface and subsurfacequality of the casting blank is improved, continuous casting is facilitated, and the production efficiency of continuous casting is improved.

Description

technical field [0001] The invention relates to mold flux for continuous casting, in particular to an ultra-low carbon mold flux for continuous casting of automobile plates, and also relates to a preparation method for the mold flux. Background technique [0002] In recent years, due to its excellent performance, ultra-low carbon steel has achieved rapid development in the international scope, and has gradually become a new generation of stamping steel after boiling steel and aluminum-killed steel. It is the highest level and development direction of stamped steel plate production in the world today. The composition characteristics of ultra-low carbon steel mainly include: ultra-low carbon, microalloying, and pure steel. The production of ultra-low carbon steel in my country is still in its infancy. Due to many restrictive factors such as smelting conditions and continuous casting technology, the production of ultra-low carbon steel is facing severe challenges, especially t...

AI Technical Summary

Problems solved by technology

In the continuous casting production process of ultra-low carbon steel, the melting point and viscosity of the mold slag will further increase after the inclusion of aluminum oxide in the molten steel is absorbed by the mold slag, resulting in insufficient lubrication performance of the mold slag and endangering continuous casting go straight

Since continuous casting mold flux contains a certain amount of carbonaceous materials, it is easy to cause carburization on the surface of the slab and carburization of molten steel in the mold, resulting in deterioration of the surface quality of the ultra-low carbon steel slab

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