RU2364653C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy particularly dealing with cast iron compositions. The proposed material is to be used for manufacture of brake assembly components. The cast iron composition (wt %) is as follows: carbon - 1.8-2.2%; silica - 2.0-2.4%; manganese - 24.0-26.0%; aluminium - 8.5-10.5%; vanadium 0.7-1.1%; calcium 0.06-0.08%; germanium - 0.002-0.003%; selenium - 0.002-0.003%; nitrogen - 0.002-0.003%; iron -balance.

EFFECT: enhanced wear resistance of cast iron.

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Description

The invention relates to the field of ferrous metallurgy, in particular to compositions of cast iron, which can be used for the manufacture of parts of brake devices.

Known cast iron, including, wt.%: Carbon 1.4-2.2; silicon 0.3-1.51; manganese 20.2-25.06; aluminum 8.9-11.8; vanadium 0.1-0.5; calcium 0.01-0.1; iron - the rest [1].

The objective of the invention is to increase the wear resistance of cast iron.

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, aluminum, vanadium, calcium, iron, additionally contains germanium, selenium and nitrogen in the following ratio of components, wt.%: Carbon 1.8-2.2; silicon 2.0-2.4; manganese 24.0-26.0; aluminum 8.5-10.5, vanadium 0.7-1.1; calcium 0.06-0.08; germanium 0.002-0.003; selenium 0.002-0.003; nitrogen 0.02-0.03; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.% one 2 3 Carbon 1.8 2.0 2.2 Silicon 2.0 2.2 2,4 Manganese 26.0 25.0 24.0 Aluminum 10.5 9.5 8.5 Vanadium 0.7 0.9 1,1 Calcium 0.06 0,07 0.08 Germanium 0.002 0.0025 0.003 Selenium 0.002 0.0025 0.003 Nitrogen 0.02 0,025 0,03 Iron rest rest rest Depreciation, unit 0.85-0.9 0.85-0.9 0.85-0.9 Note: for 1 rel. dry friction wear of known cast iron [1] under specific pressure up to 100 kgf / cm ² , sliding speed up to 5.7 m / s, counterbody - gray cast iron modified (MSC 28-48) was adopted.

Improving the wear resistance of cast iron is achieved due to the complex effect of the components that make up its composition. Vanadium strengthens the solid solution. Aluminum slows down the growth of scale. In a chemically bound state with aluminum and vanadium, nitrogen, forming nitrides, becomes an alloying element that improves the structure and mechanical properties of cast iron. Copper prevents the development of cracks. Manganese provides increased alloy hardness. Calcium deoxidizes cast iron. Germanium and selenium regulate grain growth.

Cast iron is smelted in cupolas, a duplex process or in electric furnaces and cast in sand forms. The temperature of the melt when casting molds should be at least 1320 ° C. Castings are tempered at a temperature of 200-230 ° C to relieve linear stresses.

Information sources

1. And with. No. 9886956 USSR, C22C 37/10, 1983.

Claims (1)

Cast iron containing carbon, silicon, manganese, aluminum, vanadium, calcium, iron, characterized in that it additionally contains germanium, selenium and nitrogen in the following ratio, wt.%:
carbon 1.8-2.2 silicon 2.0-2.4 manganese 24.0-26.0 aluminum 8.5-10.5 vanadium 0.7-1.1; 3 calcium 0.06-0.08 germanium 0.002-0.003 selenium 0.002-0.003 nitrogen 0.02-0.03 iron rest