RU2333271C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field. Particularly it concerns cast iron content. Cast iron contents components at a following ratio, mass %: carbon 2.8-3.2; silicon 1.8-2.2; manganese 1.8-2.2; chrome 0.8-1.2; nickel 0.8-1.2; vanadium 0.1-0.2; copper 0.8-1.2; titanium 0.1-0.2; barium 0.005-0.01; niobium 0.1-0.2; phosphorus 0.08-0.12; rare-earth metals 0.01-0.02; aluminium 0.3-0.4; boron 0.3-0.4; iron - the rest.

EFFECT: improving of cast iron endurance.

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Description

The invention relates to the field of metallurgy and relates to compositions of gray cast iron, which can be used for the manufacture of parts for machine-tool and press-forging equipment, in the automotive industry, agricultural engineering.

Known cast iron, including, wt.%: Carbon 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; chrome 0-1.5; nickel 0-2.5; vanadium 0-1.0; copper 0-4.0; titanium 0-1.0; barium 0-0.2; niobium 0-1.0; phosphorus 0.05-1.5; REM 0-0.2; aluminum 0-0.2; boron 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 in that in cast iron containing carbon, silicon, manganese, chromium, nickel, vanadium, copper, titanium, barium, niobium, phosphorus, rare-earth metals, aluminum, boron, iron, the components are in the following ratio, wt.%: carbon 2.8-3.2; silicon 1.8-2.2; manganese 1.8-2.2; chrome 0.8-1.2; nickel 0.8-1.2; vanadium 0.1-0.2; copper 0.8-1.2; titanium 0.1-0.2; barium 0.005-0.01; niobium 0.1-0.2; phosphorus 0.08-0.12; REM 0.01-0.02; aluminum 0.3-0.4; boron 0.3-0.4; iron is the rest.

The table shows the composition of cast iron

Table Components Content, wt.% In the compositions one 2 3 Carbon 2,8 3.0 3.2 Silicon 2.2 2.0 1.8 Manganese 1.8 2.0 2.2 Chromium 0.8 1,0 1,2 Nickel 1,2 1,0 0.8 Vanadium 0.1 0.15 0.2 Copper 1,2 1,0 0.8 Titanium 0.1 0.15 0.2 Barium 0.005 0.008 0.01

Table continuation Components Content, wt.% In the compositions one 2 3 Niobium 0.2 0.15 0.1 Phosphorus 0.08 0.1 0.12 REM 0.01 0.02 0,03 Aluminum 0.3 0.4 0.5 Boron 0.4 0.35 0.3 Iron rest rest rest Depreciation, unit ~ 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.

The increase in wear resistance of cast iron is due to the complex effect of the components that make up its composition. Chrome and boron stabilize carbides, provide increased hardness of cast iron. Copper promotes graphitization. Niobium strengthens the solid solution. Nickel increases the strength and plastic properties of the alloy. Aluminum, barium, rare-earth metals and vanadium act as deoxidizers. Titanium contributes to the formation of a fine-grained structure of cast iron. Phosphorus forms a low-melting eutectic, its hard sections in the material of a fine-grained structure increase wear resistance.

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 1330 ° C. Castings are annealed at a temperature of 500-550 ° C to relieve internal stresses.

The source of information

1. JP 60-121254, C22C 37/08, 1985

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, nickel, vanadium, copper, titanium, barium, niobium, phosphorus, rare-earth metals, aluminum, boron, iron, characterized in that the components are contained in the following ratio, wt.%: Carbon 2, 8-3.2; silicon 1.8-2.2; manganese 1.8-2.2; chrome 0.8-1.2; nickel 0.8-1.2; vanadium 0.1-0.2; copper 0.8-1.2; titanium 0.1-0.2; barium 0.005-0.01; niobium 0.1-0.2; phosphorus 0.08-0.12; REM 0.01-0.02; aluminum 0.3-0.4; boron 0.3-0.4; iron is the rest.