RU2353695C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly cast iron content. Cast iron contains components in a following ratio, wt %: carbon 2.2-2.7; silicon 1.0-1.5; manganese 1.0-1.5; chrome 30.0-32.0; titanium 0.1-0.15; copper 0.8-1.2; vanadium 0.15-0.3; nitrogen 0.01-0.02; selenium 0.01-0.02; arsenic 0.001-0.002; stibium 0.001-0.002; iron - the rest.

EFFECT: increasing of cast iron wear resistance.

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Description

The invention relates to the field of metallurgy, in particular to compositions of high-chromium cast irons, which can be used for the manufacture of machine parts and equipment operating in conditions of friction and increased wear.

Known cast iron, containing, wt.%: Carbon 2.5-6.5; silicon 0.8-2.5; manganese 0.4-1.5; chrome 16.0-35.0; titanium 0-0.8; copper 0-1.0; vanadium 0.1-2.0; nitrogen 0-0.08; 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, chromium, titanium, copper, vanadium, nitrogen, iron, additionally contains selenium, arsenic and antimony, in the following ratio of components, wt.%: Carbon 2.2-2 , 7; silicon 1.0-1.5; manganese 1.0-1.5; chrome 30.0-32.0; titanium 0.1-0.15; copper 0.8-1.2; vanadium 0.15-0.3; nitrogen 0.01-0.02; selenium 0.01-0.02; arsenic 0.001-0.002; antimony 0.001-0.002; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.%, In the compositions one 2 3 Carbon 2.2 2.5 2.7 Silicon 1,0 1.3 1,5 Manganese 1,0 1.3 1,5 Chromium 32,0 31,0 30,0 Titanium 0.1 0.12 0.15 Copper 0.8 1,0 1,2

Table continuation Components Content, wt.%, In the compositions one 2 3 Vanadium 0.15 0.22 0.3 Nitrogen 0.01 0.015 0.02 Selenium 0.01 0.015 0.02 Arsenic 0.001 0.0015 0.002 Antimony 0.002 0.0015 0.001 Iron rest rest rest Depreciation, unit ~ 0.95 ~ 0.95 ~ 0.95 Note: 1) cast iron may contain as impurities: phosphorus up to 0.1 wt.% And sulfur up to 0.05 wt.%; 2) 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.

The increase in wear resistance of cast iron is due to the complex effect of the components that make up its composition. Chrome provides increased hardness of cast iron. In a chemically bound state with vanadium and titanium, nitrogen, forming nitrides, becomes an alloying element that improves the structure and mechanical properties of cast iron. Copper strengthens the solid solution. Arsenic and selenium in the structure of cast iron have the form of finely divided inclusions, which prevent the formation of burrs. Antimony helps chop grain.

Cast iron is smelted in electric furnaces and sand forms are cast. Castings are tempered at a temperature of 200-230 ° C to relieve linear stresses.

Information sources

1. CN 1530201, B23K 9/04, 2004.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, titanium, copper, vanadium, nitrogen, iron, characterized in that it additionally contains selenium, arsenic and antimony in the following ratio of components, wt.%: Carbon 2.2-2.7 ; silicon 1.0-1.5; manganese 1.0-1.5; chrome 30.0-32.0; titanium 0.1-0.15; copper 0.8-1.2; vanadium 0.15-0.3; nitrogen 0.01-0.02; selenium 0.01-0.02; arsenic 0.001-0.002; antimony 0.001-0.002; iron the rest.