SU884837A1 - Slag forming mixture - Google Patents

Description

(54) SLAG FORMING MIXTURE

I

The invention relates to metallurgy, more specifically to the continuous casting of metals and alloys, and can be used to protect the metal mirror in the mold of a continuous casting plant.

A known slag-forming mixture for protecting a metal mirror, containing portland cement, a heat insulator, and synthetic pshak powder, calcium oxide system and silicon-alumina-fluoride calcium-sodium and potassium oxides with basicity of 0.4-0.9 and melting point below 1200 ° C the following ratio of components, wt.%:

Thermal insulator 2-15 Portland cement 30-60 Synthetic slag powder Else The presence of a synthetic shalk in the mixture makes it difficult to manufacture, and scarce and expensive components in slag powder (for example, calcium fluoride) narrow the raw material base for the mixture. In addition, the known mixture in the casting of, for example, high-strength pipe steel does not provide a satisfactory quality of the ingot surface due to the formation of spider-like cracks.

The purpose of the invention is to reduce the labor intensity, the expansion of the raw material base for the manufacture of cm, es, and the disposal of industrial waste, as well as the quality of ingots of a wider brand assortment.

This goal is achieved by the fact that the slag-forming mixture for continuous casting of metals and alloys, containing portland cement and carbon-containing substance, additionally contains highly oxidative and weakly oxidizing fluxes used, with the components of the mixture taken in a ratio, wt.%:

Portla 1 cement 30-40 Carboniferous substance 2-15

Strong oxidizing flux15-25 Mild oxidative flux Else Graphite, carbonaceous coal, pyrocarbon, pyroyl, etc. can be taken as carbonaceous substances.

Additional input into the slag-forming mixture of used highly oxidizing and weakly oxidizing fluxes reduces the laboriousness of making the mixture, since the fluxes are synthetic synthetic slags, expanding the raw material base for manufacturing the mixture through the use of widespread fluxes, which already have scarce and expensive components, as well as waste disposal industrial - the use of welding fluxes.

Strongly oxidizing and weakly oxidizing fluxes in the mixture, their ratio and the ratio of other components provide high-quality (without spider-like cracks) surface of a wide range of ingots by reducing the wetting ability of the resulting slag to the copper walls of the crystallizer, causing minimal development of folding on the surface of the ingot, and increasing the assimilation capacity slag to non-metallic inclusions containing titanium oxides and other microalloying elements, fuels pours their minimum content in the metal near the folds. Both factors are associated with magnesium oxide, contained in highly oxidative and weakly oxidizing fluxes. In addition, a high-quality surface of ingots of a wide brand assortment is also provided by stabilizing the temperature range of the smoothness of the mixture provided along with calcium fluoride (and oxides of sodium and potassium) and manganese oxide, which is resistant to silicon oxide compared to calcium fluoride.

Claims (1)

Invention Formula Slag-forming mixture for continuous casting of metals and alloys, containing Portland cement and carbon-containing substance, characterized in that, in order to expand the raw material base for the production of the mixture and utilize industrial waste, as well as to improve the quality of a wide brand assortment ingots, weak oxidizing fluxes, while the components of the mixture are taken in a ratio, wt.%: Portland Cement 30-40 Carboniferous substance2-15 Highly oxidative 41LyUS15-25 Weak oxidative flux Sources of information taken into account in the examination j. USSR Author's Certificate No. 570645, cl. C 21 C 5/54, 1975.