RU2366743C1 - Iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to compositions of iron. Iron contains components at following ratio, wt %: carbon 3.0-3.5; silicon 1.1-1.7; manganese 0.5-1.0; phosphorus 0.16-0.2; aluminium 0.1-0.15; calcium 0.01-0.015; boron 0.01-0.02; copper 0.8-1.2; tin 0.001-0.0015; vanadium 0.4-0.6; cerium 0.1-0.15; indium 0.01-0.015; selenium 0.001-0.0015; iron - the rest.

EFFECT: increased wear resistance of iron.

1 tbl

Description

The invention relates to the field of metallurgy, in particular to compositions of cast iron, which can be used for the manufacture of screws, bushings, piston rings and other parts of machines operating in friction conditions.

Known cast iron, containing, wt.%: Carbon 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; phosphorus 0.05-1.5; aluminum 0-0.2; calcium 0-0.2; boron 0-1.0; copper 0-4.0; tin 0-0.5; vanadium 0-1.0; 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, phosphorus, aluminum, calcium, boron, copper, tin, vanadium, iron, additionally contains cerium, indium, selenium in the following ratio, wt.%: Carbon 3, 0-3.5; silicon 1.1-1.7; manganese 0.5-1.0; phosphorus 0.16-0.2; aluminum 0.1-0.15; calcium 0.01-0.015; boron 0.01-0.02; copper 0.8-1.2; tin 0.001-0.0015; vanadium 0.4-0.6; cerium 0.1-0.15; indium 0.01-0.015; selenium 0.001-0.0015; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 3.0 3.3 3,5 Silicon 1,1 1.3 1.7 Manganese 0.5 0.7 1,0 Phosphorus 0.16 0.18 0.2 Aluminum 0.1 0.13 0.15 Calcium 0.01 0.013 0.015 Boron 0.02 0.015 0.01 Copper 0.8 1,0 1,2 Tin 0.001 0.0013 0.0015 Vanadium 0.4 0.5 0.6 Cerium 0.15 0.13 0.1 Indium 0.01 0.013 0.015 Selenium 0.0015 0.0013 0.001 Iron rest rest rest Depreciation, Rel. units ~ 0.9 ~ 0.9 ~ 0.9 Note: for 1 rel. units 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.

In the composition of cast iron, the components manifest themselves as follows.

Vanadium, aluminum and copper increase the ductility of cast iron, improve its structure, and prevent the occurrence and development of cracks. Calcium and cerium contribute to the formation of cast iron structure with short rounded graphite plates uniformly distributed in the casting, reduce alloy wear. Indium favorably affects the state of grain boundaries. Phosphorus forms a low-melting eutectic, its hard sections in the fine-grained material contribute to the increase of wear resistance of cast iron. Boron stabilizes carbides, increases the hardness and wear resistance of the alloy. Tin contributes to the grinding of grain, selenium reduces the number of burrs formed during friction.

Cast iron is smelted in cupola furnaces, by a duplex process or in electric furnaces, and cast into hot (400-450 ° C) metal molds coated with refractory clay. Castings are annealed at a temperature of 600 ° C.

Information sources

1. JP 60-121254 A, C22C 37/00, 1985.

Claims (1)

Cast iron containing carbon, silicon, manganese, phosphorus, aluminum, calcium, boron, copper, tin, vanadium, iron, characterized in that it additionally contains cerium, indium and selenium in the following ratio, wt.%: Carbon 3.0 -3.5; silicon 1.1-1.7; manganese 0.5-1.0; phosphorus 0.16-0.2; aluminum 0.1-0.15; calcium 0.01-0.015; boron 0.01-0.02; copper 0.8-1.2; tin 0.001-0.0015; vanadium 0.4-0.6; cerium 0.1-0.15; indium 0.01-0.015; selenium 0.001-0.0015; iron is the rest.