SU844635A1 - Modifier - Google Patents

Description

(54) MODIFIER

one

The invention relates to foundry metallurgy and can be used to produce high quality iron castings.

Known modifier for cast iron, containing, wt.%: Carbonaceous material 3-10, iron shavings the rest 1.

The use of this modifier does not sufficiently ensure the obtaining of optimal energy and metallurgical modes of the cupola furnace for cast iron due to the insufficient metallurgical value of the metal charge in which it is included.

Also known modifier for cast iron, containing ,. wt.%: carbon-containing material 5-10, manganese concentrate 5-10, iron shavings - the rest.

This modifier partially eliminates the disadvantages of the previously mentioned, however, the influence of the modifier on the heat engineering regime, as well as the technological and physicomechanical characteristics of the pig iron produced, is not fully manifested.

The aim of the invention is to reduce the chill depth and increase

mechanical and casting properties of cast iron.

The goal is achieved by the fact that the proposed modifier as a carbon-containing material contains silicon carbide at the following ratio of components, wt.%;

Manganese concentrate10–5–15 Creme carbide 5–15 Pig iron shavings Else Due to the high reactivity of silicon carbide in relation to metal and slag with its optimal combination, when SiC contributes 13% Si49% 51 (ratio 3.7), the most effective conditions 20 influence it on the process of crystallization and structure formation, which manifests itself in an increase in the degree of graphitization of cast iron and a decrease in the chill depth, in an increase in the mechanical

25 properties of cast iron.

PRI me R. Experimental melting was carried out in a cupola with a capacity of 5-6 tons / hour, equipped with a system of water cooling and heating to blow to, you

thirty

hp cast iron of the following chemical composition,%: carbon - 3.3; silicon 1,8; manganese - 0.45; sulfur - not more than 0.1; phosphorus - up to 0.12.

After processing this initial composition of cast iron with a modifier prototype, its chemical composition corresponded to the following data,%: carbon 3.5-3.9; .1.8; manganese 0.50-0.60; sulfur - no more than 0.09, phosphorus - up to 0.12.

The chemical composition of cast iron, treated with the proposed modifier.

Claims (1)

1.Bashkin N.Ya., Shafransky V.K. The effectiveness of the replacement of iron scrap in the metal charge cupola briquettes with reducing agent VSU, Voronezh, 1970, p.53. 2, USSR Author's Certificate 584037, cl. C 21 C 1/08, 1977.