SU564351A1 - Modifier - Google Patents

Description

I

The invention relates to foundry, in particular to the modification of ductile iron.

Modifiers are currently known that affect primary crystallization and prevent the formation of graphite in cast iron.

Tellurium in the amount of 0.0025-1.0% by weight of cast iron is introduced into the fuuf molten metal to increase the hardness and mechanical properties of cast iron G.

Tellurium in the amount of 0, bl-O, 2% of the weight of cast iron, is introduced to eliminate interfacing {graphite graphite in white cast iron 2j.

11gly modifier consisting of

tellurium and aluminum, injected into cast iron, in amount based on the weight of liquid iron,%;

Aluminum O, oi-0.05. :

Tellur0 ,.

The disadvantages of the known modifiers are that, firstly, they do not provide effective modification, and, secondly, the presence of a large amount of tellurium causes a rise in the cost of these modifiers.

In order to eliminate these drawbacks, the proposed modifier additionally contains lead and the components taken in the following I ratio, weight. %:

Tellur10-25

Lead1O-25

Aluminum Else.

The modifier is introduced into the iron in an amount of O, O1-O, O4% by weight of the liquid iron. The optimal is the addition of a modifier that provides an introduction to cast iron in weight,% by weight of cast iron: aluminum - 0, O1-0, O2; tellurium - O, OO1-O, OO5; lead - О, ОО1ОО, 5.

The modifier is introduced into the metal in the form of curds, in which lead and tellurium are powdered or in the form of an alloy, and aluminum is in the form of an ingot.

The introduction of sshs leads to an increase in chilling and reduces the amount of input tellurium and aluminum while improving annealing and without loss of mechanical properties.

Example 1, In the composition of the cast iron: carbon 2.9-3.2%, silicon 1.1-1.3%, iron-Om | tal) | zoe introduced a modifier containing,%: Theogur 2O, Swede 20, Aluminum 160 In puremararej a pure white cast iron was obtained.

Example;; 2. A modifier was introduced into the same cast iron, containing,%: tellurium. 10) lead 1O, aluminum 8O. The kink was pure white.

PRI me R 3. In the cast iron of the same composition | introduced a modifier containing,%: tel-,

lur 18, lead 18 aluminum 64, B samples were observed in 7O% ozer.

Claims (2)

1. German Patent No. 712313, Cl, 18 L 1/08, 1941, 2. US Patent No. 22535О2, cl. 75-123, 1941 3, Bogachev, I. N., Davydov, TS, Rozhkova, S. B. D) rafigiaats1sh and thermal treatment of white cast iron, M., Mashchinostroenne, 1964, p. 23-25.