RU2305714C1 - Cast iron - Google Patents

Abstract

FIELD: ferrous metallurgy; production of the cast iron compositions with good impact resilience.

SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the compositions of the cast irons. The cast iron contains the components in the following ratio (in mass %): carbon - 3.0-3.8; silicon - 0.8-1.2; manganese - 0.4-0.8; magnesium - 0.003-0.008; aluminum - 0.3-0.5; chromium - 0.8-1.2; cobalt - 0.8-1.2; iron - the rest. Usage of the invention ensures the increased heat stability of the cast iron.

EFFECT: the invention ensures the increased heat stability of the cast iron.

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Description

The invention relates to the field of ferrous metallurgy, in particular to compositions of cast iron, which can be used for the manufacture of parts for furnaces, burners of gas and electric stoves.

Known cast iron, containing, wt.%: Carbon 3.0-4.5; silicon 0.5-0.8;

manganese 0.1-0.6; magnesium 0.03-0.1; aluminum 0.5-0.9; iron - the rest [1].

Also known is cast iron, containing, wt.%: Carbon 2.5-4.0; silicon 0.5-3.5; manganese 0.2-1.5; magnesium 0.02-0.1; aluminum 0-2.0; chrome 0-3.0; iron - the rest [2].

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, magnesium, aluminum, chromium, iron, additionally contains cobalt in the following ratio of components, wt.%: Carbon 3.0-3.8; silicon 0.8-1.2; manganese 0.4-0.8; magnesium 0.003-0.008; aluminum 0.3-0.5; chrome 0.8-1.2; cobalt 0.8-1.2; iron is the rest.

The table shows the composition of cast iron.

The composition of cast iron manifests the complex effect of its constituent components. Chrome stabilizes carbides. Manganese inhibits the release of graphite, inhibits grain growth. Magnesium acts as a deoxidizing agent, contributes to obtaining a fine-grained structure. Cobalt contributes to the hardening of the solid solution, improves the metal base of the structure of cast iron, which helps to increase its heat resistance.

Cast iron is smelted in electric furnaces and cast in raw sand forms. To relieve foundry stresses, cast iron is subjected to low-temperature annealing at 550-650 ° С.

Table Structure Components, wt.% Carbon Silicon Manganese Magnesium Aluminum Chromium Cobalt Heat resistance cycles one 3.0 1,2 0.4 0.008 0.5 0.8 1,2 400-500 2 3.4 1,0 0.6 0.005 0.4 1,0 1,0 400-500 3 3.8 0.8 0.8 0.003 0.3 1,2 0.8 400-500 Note: iron is the rest.

Information sources

1. USSR copyright certificate No. 550454, 1977.

2. Japanese application No. 2005-290533, 2005.

Claims (1)

Cast iron containing carbon, silicon, manganese, magnesium, aluminum, chromium, iron, characterized in that it additionally contains cobalt in the following ratio of components, wt.%: Carbon 3.0-3.8; silicon 0.8-1.2; manganese 0.4-0.8; magnesium 0.003-0.008; aluminum 0.3-0.5; chrome 0.8-1.2; cobalt 0.8-1.2; iron is the rest.