RU2352677C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains components in a following ratio, wt %: carbon 3.0-4.0; silicon 1.0-1.5; manganese 0.5-1.0; phosphorus 0.2-0.3; cerium 0.1-0.3; calcium 0.005-0.01; titanium 0.05-0.1; boron 0.1-0.16; copper 0.1-0.2; tungsten 0.7-1.1; selenium 0.01-0.02; iron - the rest.

EFFECT: cast iron free-flowing increasing.

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Description

The invention relates to the field of ferrous metallurgy, and in particular to compositions of cast iron, which can be used in mechanical engineering, machine tool building.

Known cast iron, containing, wt.%: Carbon 3.2-3.9; silicon 1.25-1.7; manganese 0.005-0.03; phosphorus 0.15-0.6; cerium 0.002-0.006; calcium 0.02-0.05; titanium 0.001-0.1; boron 0.002-0.008; copper 0.8-1.2; iron - the rest [1]. The tensile strength of such cast iron is 725-730 MPa, the fluidity of 715-725 mm.

The objective of the invention is to increase the fluidity of cast iron.

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, phosphorus, cerium, calcium, titanium, boron, copper, iron, additionally includes tungsten and selenium in the following ratio of components, wt.%: Carbon 3.0-4, 0; silicon 1.0-1.5; manganese 0.5-1.0; phosphorus 0.2-0.3; cerium 0.1-0.3; calcium 0.005-0.01; titanium 0.05-0.1; boron 0.1-0.16; copper 0.1-0.2; tungsten 0.7-1.1; selenium 0.01-0.02; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.%, In the compositions one 2 3 Carbon 3.0 3,5 4.0 Silicon 1,5 1,2 1,0 Manganese 0.5 0.8 1,0 Phosphorus 0.2 0.25 0.3 Cerium 0.1 0.2 0.3 Calcium 0.005 0.007 0.01

Table continuation Components Content, wt.%, In the compositions one 2 3 Titanium 0.05 0,07 0.1 Boron 0.1 0.13 0.16 Copper 0.1 0.15 0.2 Tungsten 0.7 0.9 1,1 Selenium 0.02 0.015 0.01 Iron rest rest rest Fluidity, mm 800 ± 10 800 ± 10 800 ± 10

In the composition of cast iron, the components manifest themselves as follows. Boron stabilizes carbides. Tungsten strengthens the solid solution. Cerium and calcium act as deoxidizers. Copper improves the metal base of the alloy. Titanium, selenium and phosphorus, forming a low-melting eutectic, contribute to the grinding of grain.

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. The castings are annealed at a temperature of 900-980 ° C, followed by cooling with a furnace.

Information sources

1. SU 1581768 A1, C22C 37/10, 1990.

Claims (1)

Cast iron containing carbon, silicon, manganese, phosphorus, cerium, calcium, titanium, boron, copper, iron, characterized in that it additionally contains tungsten and selenium in the following ratio of components, wt.%; carbon 3.0-4.0; silicon 1.0-1.5; manganese 0.5-1.0; phosphorus 0.2-0.3; cerium 0.1-0.3; calcium 0.005-0.01; titanium 0.05-0.1; boron 0.1-0.16; copper 0.1-0.2; tungsten 0.7-1.1; selenium 0.01-0.02; iron the rest.