RU2365662C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to cast iron composition. Cast iron contains components in the following ratio, wt %: carbon 3.0-3.4; silicon 0.8-1.2; manganese 0.4-0.8; aluminium 0.3-0.4; copper 2.2-2.6; vanadium 0.6-0.8; nitrogen 0.001-0.002; tin 0.001-0.002; antimony 0.001-0.002; hafnium 0.8-1.2; indium 0.001-0.002; silver 0.001-0.002; the rest is iron.

EFFECT: enhanced strength of cast iron.

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Description

The invention relates to the field of metallurgy, in particular to compositions of gray cast iron, which can be used in railway engineering.

Known cast iron, containing, wt.%: Carbon 3.0-4.3, silicon 0-2.5; manganese 0-0.3; aluminum 0-0.05; copper 0-0.2; vanadium 0-0.1; nitrogen 0-0.008; tin 0-0.05; antimony 0-0.02; iron - the rest [1].

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

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, aluminum, copper, vanadium, nitrogen, tin, antimony, iron, additionally includes hafnium, indium, silver, and the components are in the following ratio, wt.%: Carbon 3 0-3.4; silicon 0.8-1.2; manganese 0.4-0.8; aluminum 0.3-0.4; copper 2.2-2.6; vanadium 0.6-0.8; nitrogen 0.001-0.002; tin 0.001-0.002; antimony 0.001-0.002; hafnium 0.8-1.2; indium 0.001-0.002; silver 0.001-0.002; iron is the rest.

The table shows the composition of cast iron.

Table Structure Components, wt.%: Carbon Silicon Manganese Aluminum Copper Vanadium Nitrogen Tin Antimony one 3.0 1,2 0.8 0.3 2.2 0.8 0.001 0.001 0.001 2 3.2 1,0 0.6 0.35 2,4 0.7 0.0015 0.0015 0.0015 3 3.4 0.8 0.4 0.4 2.6 0.6 0.002 0.002 0.002

Table continuation Structure Components, wt.%: The tensile strength of cast iron, kgf / mm ² Hafnium Indium Silver Iron one 0.8 0.002 0.002 rest -90 2 1,0 0.0015 0.0015 rest -90 3 1,2 0.001 0.001 rest ~ 90

The increase in the strength of cast iron is due to the complex effect of the components that make up its composition. Vanadium improves the metal base of the alloy increases its viscosity and ductility. Copper increases the strength of cast iron, increases the content of perlite in the alloy, manganese contributes to its grinding. Aluminum acts as a deoxidizer. 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. Hafnium increases the strength and hardness of cast iron. Tin, antimony, indium and silver contribute to the formation of a fine-grained alloy structure.

Cast iron is smelted in electric furnaces and sipped in hot (400-500 ° C) metal molds coated with refractory clay. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. DE 1483304 A, 1970.

Claims (1)

Cast iron containing carbon, silicon, manganese, aluminum, copper, vanadium, nitrogen, tin, antimony, iron, characterized in that it additionally contains hafnium, indium, silver in the following ratio, wt.%: Carbon 3.0-3 ,four; silicon 0.8-1.2; manganese 0.4-0.8; aluminum 0.3-0.4; copper 2.2-2.6; vanadium 0.6-0.8; nitrogen 0.001-0.002; tin 0.001-0.002; antimony 0.001-0.002; hafnium 0.8-1.2; indium 0.001-0.002; silver 0.001-0.002; iron is the rest.