SU1435611A1 - Coating material for magnesium-containing alloying compositions in ladle treatment of iron - Google Patents

Abstract

The invention relates to metallurgy and can be used in the manufacture of castings from high-strength nodular cast iron. The purpose of the invention is to increase the degree of absorption of magnesium in the molten iron, increase the tensile strength of the iron during stretching and its plasticity. New blanket material for bucket modifying o6pa6oTKJi cast iron magic-containing ligatures contains carbon passivator - crushed coke and heat-insulating additive - waste production of recycled aluminum in the following ratio, wt.%: Crushed coke 20-49; waste from production, recycled aluminum 51-80. The use of recycled aluminum production wastes in the covering material allows increasing the degree of magnesium assimilation in cast iron by 2-3%, increasing bio, by 1.16-1, 33 and 5 by 1.33-1.66 times. 1 hp f-ly, 1 tab. (About .C

Description

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The invention relates to metallurgy, in particular, to the development of the composition of bij-B coating materials when entering the bottom of carbon ligatures containing

lightly vaporizing elements, e.g. magnesium.

: The purpose of the invention is to increase the degree of absorption of magnesium in the molten iron, increasing the tensile strength npii of the tension of the iron and its ductility.

I The limits of the content of the components included in the composition of the proposed material are due to the following.

i If the thermal content of the heat absorber in the mixture is higher than 80% and passivato ppi less than 20%, the coating material does not give the required reducing atmosphere in the contact zone, but the degree of assimilation of the modifier is reduced. With volumetric content | apii. in a mixture of heat insulator less than 5 | 1% and carbon pag Sivat more than 49% of the coating material loses 1 need 1 1e heat-insulating properties,

As the basis of the covering material, a heat insulating material is used - waste from the production of aluminum. Waste content-,%: alumina 44-60, silica, aluminum 20-30, copper 2-4, yagni oxide 4-8, calcium oxide 2-2.4, and the mixture remains.

The covering material provides the necessary conditions for passivation and heat insulation to produce high-alloyed cast iron, moreover, aluminum and copper contained in it micro-alloyed with the modifying-1b) 1st cast iron.

Copper perlitizes the structure. Yelastic perlite, as is the case with the experiments of SUSTAINABILITY under the conditions of thermal cycling, which allows to improve the resilience of castings, in particular, steel, molds, irreversible deformation (warping), and improved the mechanical properties of cast iron.

Apium and copper contribute to the formation of vermicular graphite in the modifying treatment of cast iron. The combination of high indicators of mechanical properties and thermal conductivity (iron with vermicular graphite) POZ effectively use this iron for castings

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The temperature of the thermal mixture of a significant temperature gradient, such as molds, etc. The presence of aluminum in the coating material contributes to a higher degree of assimilation of the modifier.

The cast iron is prepared by melting. At the bottom of a 5.5-ton bucket, load the modifier mixture in the form of crushed Mg-Si-Fe (3–4% Mg) in an amount of 2% by weight of the pig iron and Fe-Si — REM (5 -20% REM) in the amount 0.02-0.03% and a uniform layer of coating material is applied on it in an amount of 0.25% by weight of the melt.

The cover mix consists of willow coke waste (crushed coke) in the smelting of the charge and waste production of secondary aluminum. The ratios of the components are shown in the table.

As follows from the table, the use in the composition of the proposed covering material of waste production of secondary aluminum-sh ensures the iron ingot absorption rate by 2-3% to an increase in Gg 1.16-1.33 times and plasticity to 1. , 33 - 1.55 times.

Claims (1)

Formula of gain 1, The coating material for magnesium-containing ligatures in bucket processing of pig iron, containing carbon passivator - crushed coke and heat insulating additive, which also, in order to catch the degree of absorption of magnesium molten iron, increasing the tensile strength of the iron and its plasticity, the coating material contains as a heat insulating additive waste from the production of recycled aluminum at the following ratio of components, wt.%: Ground coke20-49 Waste from the production of recycled aluminum 51-80 2, The material according to claim 1, about t l and h a-y and y and the fact that waste from the production of recycled aluminum contain components in the following ratio, wt.%: Alumina44-60 Silica 6 10 Magnesium oxides 4-8. Calcium oxides Aluminum 2.0-2.4 20-30 Copper Impurities 2-4 Else Famous 1 Coke Aluminum chloride production waste Coke Aluminum chloride production waste Coke Aluminum chloride production waste Aluminum chloride production waste 44 Aluminum chloride production waste 50 Waste from the production of recycled aluminum 80 Coke Waste Waste from the production of recycled aluminum 75 Coke Waste 3 Waste from the production of recycled aluminum 70 70 376 72 385 70 380 2.5 71 378 2.4 69 370 20 74 450 4.0 25 74 480 4.6 30 74 500 65 35 75 520 60 40 75 515 55 Coke waste 45 74 Waste from the production of recycled aluminum 51 Coke Waste 49 Continued tabl 5.0 5.0 4.5 480 4.0 74 450 3.5