Peritectic steel continuous casting covering slag

Abstract

The invention discloses peritectic steel continuous casting covering slag, which comprises the following components in percentage by weight: 70 to 78 percent of calcium silicate, 4.5 to 8.5 percent of kieselguhr, 4.5 to 9.5 percent of insulating brick powder, 1 to 7 percent of cryolite, 1 to 7 percent of high-temperature aluminum oxide, 0.5 to 4.5 percent of carbon black, 1 to 5 percent of petroleum coke and 0.5 to 5 percent of expanded graphite. The invention has the advantages that: the peritectic steel continuous casting covering slag has high physical performance and operational performance, and can meet the requirement of peritectic steel continuous casting production of steelmaking enterprises in China at present and create huge economic and social benefits; and the invention has the characteristics that: 1, the covering slag overcomes the surface defects of casting blanks effectively, and the defective index can be reduced by over 20 percent; 2, the covering slag special for special steel can be used for producing the special steel which are not produced previously; and 3, the covering slag is stable, ensures that the production is smooth, and prevents loss caused by accidents such as bleed-out and the like.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a peritectic steel continuous casting mold flux. Background technique [0002] Peritectic steel continuous casting mold slag is a kind of mold slag with high technology content. When the liquid mold slag flows into the gap between the slab shell and the mold wall, a slag film is formed, which is beneficial to improve lubrication and heat transfer of the mold. The mold slag between the billet shell and the crystallizer wall is composed of a liquid slag layer, a glassy solid slag layer and a crystalline solid slag layer. The mold slag used for peritectic steel continuous casting should be properly adjusted to the physical properties of the three slag layers, and the viscosity of the liquid slag layer should be reduced to meet lubrication and prevent leakage. The proportion of crystal phase slows down the heat transfer and suppresses the generation of cracks on the surface of...

AI Technical Summary

Problems solved by technology

[0004] When the casting speed is high, in order to ensure sufficient slag consumption, the viscosity of the slag is expected to be lower, but it is found in production that the viscosity is too low to cause uneven thickness of the slag film, resulting in uneven heat transfer and uneven solidification