SU1054419A1 - Charge for producing spheroidal cast iron - Google Patents

Abstract

The CHARGE TO GET A CAST IRON WITH A TARE GRAPHITE containing carbon steel scrap, electrode graphite and a silicon-containing component, characterized in that, in order to improve the mechanical properties of the cast iron and reduce the cost, the mixture contains the waste of oxygen at a fraction of 100% oxygen, as well as contained oxygen in the next component: May -.%: Waste transformer iron 70,0-80,0 Electrode graphite 1.8-2.2 Pam carbon steel Else 5

Description

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The invention relates to ferrous metallurgy and can be used in the manufacture of iron castings with high mechanical properties.

The known charge for the production of nodular cast iron, containing pig iron, the return of magnesium iron, cast iron machine scrap, rail steel, ferrosilicon and ferromanganese l,

However, the mixture includes an expensive component that increases the cost of iron.

The known charge for producing iron-like cast iron with cast iron graphite containing carbon steel scrap, electrode graphite and ferrosilicon 2.

However, this composition of the charge includes expensive ferrosilicon, while the mechanical strength of the iron is not sufficient.

The purpose of the invention is to increase the mechanical properties of cast iron and reduce costs.

The goal is achieved by the fact that in the mixture for producing nodular cast iron containing carbon steel scrap, electrode graphite and silicon-containing component, as the silicon-containing component, the mixture contains waste transformer iron in the following ratio of components May.%:

Waste transformer iron 70,0-80,0 Electrode graphite 1,8-2,2 Scrap carbon steel Else

The mixture may be introduced simultaneously or in portions.

P r and m er. To prepare nodular cast iron, various charge compositions are prepared. Each charge is melted in an open induction furnace in acid crucibles. Melting is carried out as follows: 70% of the weight of the metal charge, consisting of carbon steel scrap and transformer iron waste, is loaded into the crucible and heated to lOSO-llSO C. 70% of the weight of electrode graphite is added to the crucible and the temperature rises 1530-1550 ° C. The remaining amounts of electrode graphite and meth, allic mixture are added to the molten metal. By dissolving the electrode graphite and raising the temperature to 1530-1550 0, the melt is cast into sandy-clay forms. Cylindrical rods are cast with a diameter of 15 to 50 mm.

The table shows the composition of the mixture, the mechanical properties and the shape of graphite cast iron, selected as a protreatment type, and cast iron, smelted from the charge of the proposed soil and go beyond its limits,

The tests are carried out according to the requirements of GOST 1497-61.

The use of the proposed charge provides. Compared with existing compositions, the following advantages are:, reducing the cost of castings by eliminating the consumption of ferrosilicon (not less than 7%); simplified casting process; increase of mechanical properties of castings.

Claims (1)

Batch for producing spheroidal cast iron, containing carbon steel scrap, electrode graphite and a silicon-containing component, characterized in that, in order to increase the mechanical properties of cast iron and reduce costs, the mixture contains waste transformer iron in the following ratio of components, wt. %: Transformer iron waste Graphite electrode Scrap carbon steel £ and * and * JV ς ©>