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Continuous casting mold flux for low-carbon steel, and preparation method thereof

A continuous casting mold slag and low-carbon steel technology, which is applied in the field of auxiliary materials for steelmaking and continuous casting, can solve problems such as unstable use process, large fluctuations in slag performance, and imperfect technology, so as to facilitate the separation of steel slag and reduce slag curling , Reduce the effect of slag inclusion defects

Inactive Publication Date: 2018-08-14
江苏新亿源环保科技有限公司
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problems that domestically produced slag is not perfect, the performance of slag fluctuates greatly, it is easy to cause instability in the use process, and it is easy to cause defects such as cracks and slag inclusions, a low carbon steel is provided. Continuous casting mold flux and preparation method thereof

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  • Continuous casting mold flux for low-carbon steel, and preparation method thereof

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Embodiment Construction

[0019] According to the matrix composition CaO28.5~32.5%, SiO 2 32.0~36.5%, Al 2 o 3 5.0~15.0%, MgO2.5~3.0%, MnO2.0~7.5%, Fe 2 o 3 1.2~2.5%, Na 2 O4.5~7.0%, Li 2 O2.5 ~ 4.5%, F5.5 ~ 8.5% to configure raw materials, mix the raw materials for the matrix and granulate them, and place them in a water-cooled furnace wall electric furnace without lining at a temperature higher than the melting temperature of the mold slag 150 ~ 300 ° C Melt evenly in the medium to obtain pre-melted slag; import the pre-melted slag into a normal temperature water pool to cool and solidify, filter to obtain slag, dry the slag to a water content of 0.1-2.0%, put it into a grinder, and pass it through a 200-mesh sieve. Then add a reducing agent with a mass of 1.5-3.0% of the total material, and continue grinding for 1-2 hours to obtain a mixture; put the mixture into a ball mill, then add deionized water with a mass of 1.0-1.2 times the mass of the mixture, and use 200-300r / min ball milling for 1...

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Abstract

The invention relates to a continuous casting mold flux for low-carbon steel, and a preparation method thereof, and belongs to the technical field of auxiliary materials for steelmaking and continuouscasting. According to the continuous casting mold flux, lots of pores are formed in an all-glass flux film in the preliminary stage of flux film solidification, and the overall porosity of a solid flux film is higher; the effective thermal conductivity of the glass flux film can be reduced before crystallization, and the heat transfer is controlled; the lubrication of a liquid flux film to a casting blank is ensured, and the overall porosity of the solid flux film continues remaining at the higher level through precipitation of massive cuspidine in the later stage; according to the preparation method, Si-Ca alloy powder is used as reducing agents, and the ability of the mold flux for absorbing FeS and FeO on a steel slag interface is improved; the S and O contents in meniscus molten liquid and a primary solidification shell are reduced, and the surface tension of the molten steel is increased; the slag inclusion defects of the casting blank are reduced, and the viscosity of the mold flux is improved; entrapped slag in the casting process is reduced, and the quality of the casting blank is improved; and on the basis of ensuring the melting rate, the thickness of a molten slag layerof the mold flux is increased.

Description

technical field [0001] The invention relates to continuous casting mold slag for low-carbon steel and a preparation method thereof, and belongs to the technical field of auxiliary materials for steelmaking and continuous casting. Background technique [0002] In recent years, thin slab continuous casting technology has achieved rapid development. Based on the technical characteristics of thin slab continuous casting, the requirements for continuous casting mold flux are very strict. Therefore, the research and development of mold fluxes suitable for thin slab continuous casting of different steel types has become very important. The Italian DNAIELI thin slab continuous casting machine imported by Tangshan Iron and Steel Co., Ltd. is the first FTSC continuous casting machine in China. It has a unique mold shape, and its expanded crystallizer is a patented product of DNAIEIL. Due to the difference in chemical composition, the high-temperature solidification characteristics an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 雷广云王文新史玉玲
Owner 江苏新亿源环保科技有限公司
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