SU1296295A1 - Slag-forming composition for casting steel in ingot moulds - Google Patents

Abstract

The invention relates to metallurgy, in particular to compositions of exothermic slag-forming mixtures used for casting steel into molds from above. The purpose of the invention is to increase the yield of the suitable metal and its mechanical properties, as well as reduce the adhesion of the formed slag to the walls of the mold. The goal is achieved by using a slag-forming mixture containing, in wt.%: Aluminum powder 5-12; fluorspar 15-20; silicate lump 12-20; filler 17-28; as an oxidizing agent, the material of ferromanganese nodules is 20-30 and additionally silicocalcium 6-14. Due to the low melting temperature of the mixture, the optimal physical characteristics of its slag melts, and the content of iron-manganese nodules of titanium, magnesium, cobalt, molybdenum and rare earth elements in the material, the mechanical properties and yield of the suitable metal increase, and the costs for cleaning the molds are reduced. Mixture consumption 4 kg / t steel. 2 tab. (L | S with 05 to con

Description

The invention relates to metallurgy, in particular to compositions of exothermic slag-forming mixtures used for casting steel into molds from above.

The purpose of the invention is to increase the yield of a suitable metal and its mechanical properties, as well as to reduce the adhesion of the resulting slag to the walls of the mold.

Metallurgical slags are used as a filler: blast-furnace, cupola, open-hearth main, electric furnace. The consumption of a specific slag is selected on the basis of the conditions for ensuring the basicity of the formation of it from a mixture of slag close to unity and its minimum oxidizing ability.

In tab. Table 1 shows the compositions of the slag, their mixtures according to the invention, Table 2 - the properties of the mixtures according to the invention, the characteristics of their slag melts, as well as the results of the use of mixtures in the manufacture of forging ingots weighing 4.2 tons of steel grade 45

As follows from the data table. 2, the low melting point of the mixture according to the invention, the physical properties of the slag melts of the mixtures provide high values of the yield of the metal and its mechanical properties, and reduce the adhesion of the resulting slag to the walls of the mold. Oxides of iron, manganese, silicon, aluminum, calcium, potassium and sodium.

Aluminum powder Silikokaltsy Fluorspar Silikatna lump

Material iron-manganese nodules

Filler

containing, in the material, ferromanganese nodules, contribute to the production of slags with the necessary oxidizing ability and optimal values of physical properties. The increase in the mechanical properties of the metal is provided by the presence of iron-manganese nodules of titanium, magnesium, cobalt, molybdenum and rare-earth elements in the material. Mixture consumption 4 kg / t steel.

Claims (1)

Invention Formula Slag-forming mixture for casting, steel into molds, including aluminum powder, fluorspar, silicate lump, oxidizer, filler, characterized in that, in order to increase the yield of suitable metal and its mechanical properties, as well as reduce the adhesion of the resulting slag to the walls of the mold, the mixture additionally contains silicocalciums, and, as the oxidizer, the material of ferromanganese nodules in the following ratio of ingredients, May. %: Aluminum powder 5-12 Silicocalcium 6-14 Fluorspar15-20 Silicate clump12-20 Material of ferromanganese nodules20-30 Filling17-28 five Table 1 14 15 16 30 17 12 6 17 12 25 28 Melting point Slag viscosity at, Pa-s Contact angle (degree) wetting inclusions: table 2 940-990 1090-1150 980-1040 0.036 0.030 0.035