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
CN101758175AActive Publication Date: 2010-06-30MAANSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MAANSHAN IRON & STEEL CO LTD
Publication Date
2010-06-30

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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%.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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