Low-oxidizability continuous casting covering slag

A technology of continuous casting mold flux and mold flux, which is applied in the field of low-oxidizing continuous casting mold flux, which can solve the problems of high friction coefficient between the mold wall and the slab, easy crystallization of mold flux slag, and weak network formation performance. The effect of stable component performance, improved purity, and reduced possibility of precipitation

Inactive Publication Date: 2015-05-20
武汉钢铁有限公司
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Problems solved by technology

However, the mold flux of this invention controls SiO 2 The content of slag is in the extremely low range below 2%, which leads to its weak network formation performance, so the mold slag slag is easy to crystallize, and slag strands are easy to form in the mold, which makes the friction coefficient between the mold wall and the slab large, and the lubrication effect is not good. Well, it is easy to cause cracks in the slab, and even steel breakout accidents

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  • Low-oxidizability continuous casting covering slag

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Embodiment Construction

[0021] The low-oxidizing continuous casting mold flux of the present invention will be further described in detail below in conjunction with specific examples.

[0022] Table 1 lists the chemical composition weight percentages of nine examples of the low-oxidizing continuous casting mold flux of the present invention (the balance is carbon and unavoidable impurities).

[0023] Its preparation method is as follows: Grind the raw materials containing the above ingredients into powders of less than 200 meshes and mix them with carbonaceous materials with a designed content to make the ingredients and properties meet the design requirements. After melting at high temperature, it can be obtained by crushing and slagging Nine components of low-oxidizing mold flux listed in Table 1.

[0024] The above-mentioned low-oxidizing mold slag was tested, and it was found that it was quenched after melting, and the slag glass phase was more, indicating that the crystallization temperature of ...

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Abstract

The invention discloses a low-oxidizability continuous casting covering slag comprising the following chemical components in percentage by weight: 15-25% of CaO, 20-35% of Al2O3, 10-20% of SiO2, 2-5% of Li2O+K2O, 2-10% of B2O3, F<=10%, Na2O<=10%, 5-15% of MgO+BaO+SrO, and the balance of carbon and inevitable impurities. Furthermore, the hemispheric point temperature of the continuous casting covering slag is controlled within a range from 1000 DEG C to 1200 DEG C, and the viscosity is controlled within a range from 0.2 pa. s to 0.6 pa. s. Practices show that the low-oxidizability continuous casting covering slag has good combination property and meets the requirements of continuous casting processes of steel types, i.e. TRIP (Transformation-Induced Plasticity) steel with high-content oxidizable elements i.e. Al, Ti or rare earth, and the like, silicon steel, container steel, and the like and realize the multi-furnace continuous casting.

Description

technical field [0001] The invention belongs to the technical field of continuous casting mold flux, and in particular relates to a low-oxidative continuous casting flux. Background technique [0002] Continuous casting mold powder is based on CaO-SiO 2 The multi-component mixture based on the system has the functions of thermal insulation, preventing secondary oxidation of molten steel, absorbing floating inclusions in molten steel, controlling horizontal heat transfer between slab and crystallizer, and lubricating slab, especially the latter two The function plays a decisive role in the smooth progress of the continuous casting process and the surface quality of the slab. At present, some high-value-added steels contain a large amount of easily oxidizable elements, such as high-grade non-oriented silicon steel with aluminum content of 0.8-1.2%, while aluminum in TRIP steel can be as high as 1.7%, and aluminum in these steels Its role is not only deoxidation, but also as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/07
Inventor 万恩同杨运超李具中邓德华曹同友秦世明高文芳李伟盛喜松周顺兵范宇李慕耘
Owner 武汉钢铁有限公司
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