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Covering slag for beam blank continuous casting crystallizer

A special-shaped billet continuous casting and crystallizer technology, which is applied in the field of mold flux for molten steel continuous casting molds, can solve the problems affecting the lubrication and filling of mold flux, the adhesion between the billet shell and the copper wall of the mold, and the excessive stickiness of the molten slag layer. Achieve good lubricity and uniform filling, reduce surface cracks, and reduce crack rejection rate

Active Publication Date: 2010-06-30
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basicity of the mold slag is 1.2-1.5, with an average of 1.35. Because the alkalinity of the mold slag is too large, the slag layer is too sticky during use, which affects the lubrication and filling of the mold slag, and is prone to shell and mold copper Wall adhesion, steel breakout accident

Method used

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  • Covering slag for beam blank continuous casting crystallizer
  • Covering slag for beam blank continuous casting crystallizer
  • Covering slag for beam blank continuous casting crystallizer

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Embodiment Construction

[0018] The present invention will be described in detail below with 8 implementations.

[0019] According to the chemical composition and particle size requirements listed in Table 1, the raw materials are pre-melted and sintered, mixed, crushed, granulated, dried, weighed, and bagged. After testing, the melting point °C and viscosity (1300 °C) are listed in in FIG. 1.

[0020] Table 1 Composition and properties of mold flux

[0021]

[0022]

[0023]

[0024] The mold flux of the present invention has been used to produce profiled billets for more than half a year. The production practice shows that the cracks on the surface of profiled billets are greatly reduced, and the rate of cracked rejects is significantly reduced, from 16.5kg / ton of steel to below 3.0kg / ton of steel; in the continuous casting production process , The bonding phenomenon rarely occurs, and the bonding breakout rate drops from 0.13% to 0.02%.

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Abstract

The invention provides covering slag for a beam blank continuous casting crystallizer, comprising the following components in weight percent (%): 32.0%-34.5% of CaO, 25.5%-27.8% of SiO2, 10%-12% of Al2O3, 0.5%-3.5% of F, 12%-14% of solid C, 0.5%-3.5% of R2O and 10%-12% of volatiles. The production practice indicates that the surface cracks of a beam blank are greatly reduced and the rejection rate of the beam blank with cracks is obviously decreased to below 3.0 kg / ton from 16.5 kg / ton; and in the process of continuous casting, the phenomenon of bong rarely happens, and the bonding breakout is decreased to 0.02% from 0.13%.

Description

technical field [0001] The invention relates to a mold slag for continuous casting of molten steel, in particular to mold slag for continuous casting of shaped billets. Background technique [0002] The cross-section of the special-shaped billet mold is "H"-shaped, and the shape is complex. The molten steel flow field of the mold and the shrinkage of the solidified billet shell in the mold are different from the billet, slab, and round billet molds. strict. In order to reduce the incidence of cracks on the surface of profiled blanks, mold powder was imported from Germany in the early stage of production, and its chemical composition is: CaO 35-39%, SiO 2 26-29%, Al 2 o 3 10-15%, F - 2-5%, R 2 O(Na 2 O+K 2 O) 2-6%, fixed C3-5%, its physical property is, melting point 1180-1250 ℃, viscosity 0.8-1.2Pa.s. The mold flux is characterized by high alkalinity, high viscosity and high crystallization temperature. High alkalinity, high viscosity, and high crystallization tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 吴坚杨应东许健李书成李伟峰谢桂忠薛博高腾
Owner MAANSHAN IRON & STEEL CO LTD
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