Novel casting powder and application thereof

A technology for mold slag and continuous casting mold slag, which is applied in the field of new mold slag, can solve the problems of deterioration of mold slag performance and lack of consideration, and achieve the effects of reducing defects such as longitudinal cracks and inclusions, increasing consumption, and reducing melting point and viscosity.
CN104308104AInactive Publication Date: 2015-01-28CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2015-01-28
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to novel casting powder and application thereof, and belongs to the technical field of steel continuous casting powder. The casting powder comprises the following components according to mass percentage, 30-33% of CaO, 28-34% of SiO2, 2-5% of Al2O3, 1-3% of MgO, 12-16% of (Na2O+Li2O), 1-6% of B2O3, and 11-14% of F-. The casting powder has the characteristics of low melting point (950 to 1,050 DEG C), low viscosity (the viscosity is 0.06 to 0.10Pa.s at the temperature of 1,300 DEG C), high crystallization temperature (1,215 to 1,302 DEG C) and the like. The casting power designed by the invention is suitable for the continuous casting of high-carbon chromium-containing steel of which the mass percentage of C is 1.3-1.8% and the mass percentage of Cr is 10-15%. When the casting powder is applied to the continuous casting production of a high-carbon chromium-containing steel slab, Cr2O3 and other impurities with a high melting point in a crystallizer can be effectively absorbed, the infiltration capability of the casting powder is improved, and the slow cooling of a meniscus is implemented, so that the objectives of increasing the lubricating of a casting blank, controlling the heat transferring at the meniscus, reducing the cracking and inclusion of the casting blank and improving the quality of the casting blank are achieved.
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Description

technical field

[0001] The invention relates to a novel mold flux and its application, and belongs to the technical field of iron and steel continuous casting mold flux. Background technique

[0002] As an important functional material in the continuous casting process, mold slag plays an important role in thermal insulation, preventing secondary oxidation of molten steel, absorbing non-metallic inclusions, lubricating the billet shell and controlling heat transfer in the continuous casting mold. The performance of the mold flux directly determines the quality of the slab, thereby affecting the production efficiency.

[0003] High-carbon chromium-containing steel is firstly used as high-carbon steel. From the Fe-C binary phase diagram, it can be seen that with the increase of carbon content in steel, the temperature difference between liquidus and solidus line of steel becomes larger. Therefore, high-carbon steel has a wider In the pasty temperature range, it is easier to c...

Claims

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