RU2308526C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy, in particular, cast iron compositions.

SUBSTANCE: cast iron contains components used in the following ratio, wt%: carbon 2.5-3.5; silicon 1.0-2.0; manganese 1.0-1.5; nickel 1.5-2.0; chromium 0.3-0.8; copper 0.5-1.0; cobalt 0.5-1.0; magnesium 0.03-0.05; vanadium 0.8-1.2; iron the balance.

EFFECT: increased 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 the automotive industry, tractor engineering.

Known cast iron composition, wt.%: Carbon 2,9-3,4; silicon 1.5-2.0; manganese 0.7-1.1; nickel 0.2-0.6; chrome 0.1-0.3; copper 0.2-0.5; cobalt 0.02-0.1; iron the rest [1].

Also known is cast iron composition, wt.%: Carbon 3.0-4.0; silicon 1.0-4.0; manganese 0-0.6; nickel 0.1-1.5; chrome 0.2-0.8; copper 0.2-0.8; cobalt 0.05-0.5; magnesium 0.02-0.08; iron the rest [2].

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, nickel, chromium, copper, cobalt, magnesium, iron, additionally contains vanadium, in the following ratio of components, wt%: carbon 2.5-3.5; silicon 1.0-2.0; manganese 1.0-1.5; nickel 1.5-2.0; chrome 0.3-0.8; copper 0.5-1.0; cobalt 0.5-1.0; magnesium 0.03-0.05; vanadium 0.8-1.2; iron the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 2,5 3.0 3,5 Silicon 2.0 1,5 1,0 Manganese 1,5 1.3 1,0 Nickel 1,5 1.8 2.0 Chromium 0.8 0.5 0.3 Table continuation Components Composition, wt.%: one 2 3 Copper 1,0 0.8 0.5 Cobalt 1,0 0.8 0.5 Magnesium 0.05 0.04 0,03 Vanadium 1,2 1,0 0.8 Iron rest rest rest Tensile strength, MPa 800 800 800

The increased strength of cast iron is achieved due to the complex effect of the components that make up its composition. Copper promotes graphitization and dramatically increases the content of perlite in the alloy. Manganese contributes to the grinding of perlite. Vanadium and nickel harden the solid solution. Chrome stabilizes carbides. Magnesium acts as a deoxidizer. Cobalt helps grind grain.

Cast iron is melted in electric furnaces and cast in molds. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. SU 1574670, C22C 37/08, 1990.

2. JP 2003-105484 A, C22C 37/04, 2003.

Claims (1)

Cast iron containing carbon, silicon, manganese, nickel, chromium, copper, cobalt, magnesium, iron, characterized in that it additionally contains vanadium in the following ratio of components, wt.%: Carbon 2.5-3.5; silicon 1.0-2.0; manganese 1.0-1.5; nickel 1.5-2.0; chrome 0.3-0.8; copper 0.5-1.0; cobalt 0.5-1.0; magnesium 0.03-0.05; vanadium 0.8-1.2; iron the rest.