SU837984A1 - Modifier - Google Patents

Description

(54) MODIFIER

one

The invention relates to ferrous metallurgy, in particular, to the question of creating modifiers for the off-site processing of cast iron.

Known modifier for cast iron containing silicon, calcium, aluminum, strontium, cerium and iron fll.

However, this modifier does not allow the removal of chill in cast iron.

The closest to the proposed technical essence and the achieved result is a modifier for cast iron 2, of the following composition, wt.%:

55-80

Silicon 0.1-5.0

Calcium 0 / 1-3,0

Aluminum 0.1-5.0

Strontium Rare Earth

0.1-1.5 Metals Rest Iron

The disadvantage of this modifier is that it has a high melting point and is relatively poorly absorbed by the metal being treated. In addition, the modifier has little effect on the properties of the iron, especially anti-friction.

The aim of the invention is to develop a composition of the modifier for cast iron, reducing the melting temperature of the alloy, increasing its absorption by the treated iron, improving the properties of the metal, especially anti-friction.

The goal is achieved by the fact that the proposed modifier

o additionally contains carbon and phosphorus, in the following ratio of components, wt.%:

Silicon66,5-88,0

calcium0,1-2,8

five

Aluminum 0.15-4.6 Strontium 0.85-2.2 Rare earth metals of cerium or yttrium groups 0.35-2.5 Carbon. 0.50-3.2 Phosphorus 0.8-6.5

IronErest

Carbon helps reduce

5, the melting temperature of the modifier increases the degree of its assimilation by the treated iron, improves the microstructure and properties of the metal.

-Phosphorus in the composition of the modifier

0 contributes to a decrease in the melting point of the modifier, an increase in its assimilation by the treated iron, and an increase in the antifriction properties.

Investigated the effect of the modifier known and proposed composition in the workshop of the IPL of the Academy of Sciences of the Ukrainian SSR and in the laboratories of the institute and SKTB. The chemical composition and properties of the modifiers under investigation are listed in Table 1. From its data it can be seen that alloys I and II correspond in composition to the known modifier, alloy III contains less than the lower limit. The proposed composition of carbon and phosphorus, and a-alloy IX contains more than the upper limit of carbon and phosphorus. Alloys IV-VMI correspond in composition to the proposed modifier. The results show that the proposed modifier has a lower melting point and is better absorbed. Example. The validation of the modifiers under investigation

on the original cast iron the following chemical composition, wt.%: carbon 3.36-3.48, silicon 1.64-1.73, manganese 0.82-0.89, sulfur 0.04-0.05, phosphorus 0, 08-0.09. The original cast iron is melted in the electric arc furnace DSP-0.5. 0.7, 1.0, 1.3% of the modifiers under investigation are used to process the iron. The temperature of the cast iron when entering modifiers.

Table 2 presents data on the study of the effect of various modifiers on the properties of the iron being processed. The modifier consumption is 1.0%.

The use of a modifier of the proposed composition allows eliminating the formation of structurally free cementite, even when casting iron into a chill mold, while improving the shape of graphite inclusions and reducing their size by 20-25%.

Claims (2)

Invention Formula A modifier containing silicon, calcium, aluminum, strontium, rare earth metals of cerium or yttrium groups and iron, characterized in that, in order to reduce its melting temperature, improve iron absorption and increase the mechanical and anti-friction properties of cast iron, it additionally contains carbon and phosphorus, in the following ratio, wt.%: Silicon66,5-88,0 Calcium0,1-2,8 0.15-4.6 0.85-2.2 0.35-2.5 0.5-3.2 0.8-6.5 Rest Information sources, taken into account in the examination .one. Patent of England No. 525706, 1940. 2. USSR author's certificate No. 449979, cl. C 22 C 35/00, 1975.