RU2332507C1 - Wear resistant iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to compositions of iron. Iron contains components at the following ratio, mass %: carbon 2.8-3.2; silicon 0.7-1.3; manganese 0.7-1.3; chromium 10.0-12.0; nickel 0.4-0.8; copper 0.5-1.0; vanadium 0.3-0.5; aluminium 0.1-0.2; phosphorus 0.1-0.2; nitrogen 0.1-0.2; molybdenum 1.0-1.5; magnesium 0.005-0.01; zirconium 0.1-0.2, the rest being iron.

EFFECT: upgraded wear resistance of iron.

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Description

The invention relates to the field of metallurgy and relates to compositions of white cast iron, which can be used for the manufacture of rolling rolls.

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; nickel 0-2.0; copper 0-1.0; vanadium 0.1-2.0; aluminum 0-0.1; phosphorus 0-0.1; nitrogen 0-0.08; molybdenum 0-3.5; 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 wear-resistant cast iron containing carbon, silicon, manganese, chromium, nickel, copper, vanadium, aluminum, phosphorus, nitrogen, molybdenum, iron, additionally includes magnesium and zirconium in the following ratio, wt.%: Carbon 2 8-3.2; silicon 0.7-1.3; manganese 0.7-1.3; chrome 10.0-12.0; nickel 0.4-0.8; copper 0.5-1.0, vanadium 0.3-0.5; aluminum 0.1-0.2, phosphorus 0.1-0.2; nitrogen 0.1-0.2, molybdenum 1.0-1.5; magnesium 0.005-0.01; zirconium 0.1-0.2; iron is the rest.

The table shows the compositions of wear-resistant cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 2,8 3.0 3.2 Silicon 1.3 1,0 0.7 Manganese 1.3 1,0 0.7 Chromium 10.0 11.0 12.0 Nickel 0.8 0.6 0.4 Copper 1,0 0.7 0.5 Vanadium 0.3 0.4 0.5 Aluminum 0.1 0.15 0.2 Phosphorus 0.2 0.15 0.1 Nitrogen 0.1 0.15 0.2 Molybdenum 1,0 1.3 1,5 Magnesium 0.01 0.008 0.005 Zirconium 0.2 0.15 0.1 Iron rest rest rest Depreciation,% ~ 95 ~ 95 ~ 95 Note: 100% wear is accepted for dry friction of known cast iron [1] (with chromium content of 16.0 wt.%) Under specific pressure up to 100 kgf / cm ² , sliding speed up to 5.7 m / s, counterbody - modified gray cast iron (MSCh 28-48).

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 alloy hardness. Vanadium and molybdenum strengthen the solid solution. 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. Magnesium deoxidizes cast iron. Zirconium gives a fine grain structure to the alloy. Phosphorus forms a low-melting eutectic, its hard sections in cast iron with a fine-grained structure contribute to increased wear resistance. Nickel and copper improve the metal base of the alloy, prevent the formation and development of cracks.

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)

Wear-resistant cast iron containing carbon, silicon, manganese, chromium, nickel, copper, vanadium, aluminum, phosphorus, nitrogen, molybdenum, iron, characterized in that it additionally contains magnesium and zirconium in the following ratio, wt.%: Carbon 2, 8-3.2; silicon 0.7-1.3; manganese 0.7-1.3; chrome 10.0-12.0; nickel 0.4-0.8; copper 0.5-1.0; vanadium 0.3-0.5; aluminum 0.1-0.2; phosphorus 0.1-0.2; nitrogen 0.1-0.2; molybdenum 1.0-1.5; magnesium 0.005-0.01; zirconium 0.1-0.2; iron is the rest.