RU2334805C1 - Iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to compositions of iron. Iron contains elements at a following ratio, mass %: carbon 2.8-3.2; silicon 0.8-1.2; manganese 0.8-1.2; titanium 0.1-0.2; tin 0.01-0.02; copper 0.2-0.4; molybdenum 0.8-1.2; aluminium 0.2-0.4; niobium 0.2-0.4; zinc 0.002-0.004; iron - the rest.

EFFECT: upgraded thermo resistance of iron.

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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 of metallurgical equipment.

Known cast iron, containing, wt.%: Carbon 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; titanium 0-1.0; tin 0-0.5; copper 0-4.0; molybdenum 0-0.8; aluminum 0-0.2; niobium 0-1.0; iron - the rest [1].

The objective of the invention is to increase the heat resistance of cast iron.

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, titanium, tin, copper, molybdenum, aluminum, niobium, iron, further includes zinc, in the following ratio, wt.%: Carbon 2.8-3.2 ; silicon 0.8-1.2; manganese 0.8-1.2; titanium 0.1-0.2; tin 0.01-0.02; copper 0.2-0.4; molybdenum 0.8-1.2; aluminum 0.2-0.4; niobium 0.2-0.4; zinc 0.002-0.004; 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 1,2 1,0 0.8 Manganese 0.8 1,0 1,2 Titanium 0.2 0.15 0.1 Tin 0.01 0.015 0.02 Copper 0.4 0.3 0.2 Molybdenum 0.8 1,0 1,2 Aluminum 0.4 0.3 0.2

Table continuation Components Content, wt.% In the compositions one 2 3 Niobium 0.2 0.3 0.4 Zinc 0.002 0.003 0.004 Iron rest rest rest Heat resistance (heating to 900 ° С - cooling to 20 ° С in air), cycles 110-130 110-130 110-130

The increase in heat resistance of cast iron is due to the complex effect of the components that make up its composition. Niobium and molybdenum strengthen the solid solution. Aluminum deoxidizes cast iron. Copper increases the strength and ductility of the alloy. Zinc, tin and titanium contribute to the formation of a fine-grained structure of cast iron.

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. Castings undergo normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

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

Claims (1)

Cast iron containing carbon, silicon, manganese, titanium, tin, copper, molybdenum, aluminum, niobium, iron, characterized in that it additionally contains zinc in the following ratio, wt.%: Carbon 2,8-3,2; silicon 0.8-1.2; manganese 0.8-1.2; titanium 0.1-0.2; tin 0.01-0.02; copper 0.2-0.4; molybdenum 0.8-1.2; aluminum 0.2-0.4; niobium 0.2-0.4; zinc 0.002-0.004; iron is the rest.