RU2462528C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains, by wt %: carbon 2.2-2.3, silicium 0.1-0.3, manganese 0.1-0.3, chromium 0.1-0.3, vanadium 0.4-0.6, nickel 4.0-4.4; aluminium 2.4-2.6; cobalt 0.4-0.6, tantalum 0.4-0.6, iron - the rest.

EFFECT: increased impact-fatigue strength of 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 in mechanical engineering.

Known cast iron, containing, wt.%: Carbon 1.5-4.0; silicon 1.5-6.0; manganese 0-3.0; chrome 0-3.0; vanadium 0-5.0; nickel 0-3.5; aluminum 0-2.0; cobalt 0-3.5; iron - the rest [1].

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

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, chromium, vanadium, nickel, aluminum, cobalt, iron, additionally contains tantalum in the following ratio of components, wt.%: Carbon 2.2-2.3; silicon 0.1-0.3; manganese 0.1-0.3; chrome 0.1-0.3; vanadium 0.4-0.6; nickel 4.0-4.4; aluminum 2.4-2.6; cobalt 0.4-0.6; tantalum 0.4-0.6; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.%
in the compositions one 2 3 Carbon 2.2 2.25 2,3 Silicon 0.3 0.2 0.1 Manganese 0.3 0.2 0.1 Chromium 0.1 0.2 0.3 Vanadium 0.4 0.5 0.6 Nickel 4.0 4.2 4.4 Aluminum 2.6 2.5 2,4 Cobalt 0.6 0.5 0.4 Tantalum 0.6 0.5 0.4 Iron rest rest rest

The number of strokes before the destruction of cylindrical cast iron castings with a height of 200 mm and a diameter of 50 mm at an energy of 650 J is ~ 400 for all the compositions listed in the table.

Increased impact fatigue strength of cast iron is achieved due to the complex effect of the components included in its composition. Vanadium, cobalt, tantalum strengthen the alloy. Nickel and chromium also contribute to increasing the strength of the alloy, prevent deformation of products. Aluminum increases the viscosity of the alloy, reduces the tendency to crack formation upon impact.

Cast iron is smelted in cupolas or in electric furnaces and cast in metal molds. The melt temperature when pouring linear forms should not be lower than 1330 ° C. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. DT 2428821 A1, 1975.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, vanadium, nickel, aluminum, cobalt, iron, characterized in that it additionally contains tantalum in the following ratio of components, wt.%: Carbon 2.2-2.3; silicon 0.1-0.3; manganese 0.1-0.3; chrome 0.1-0.3; vanadium 0.4-0.6; nickel 4.0-4.4; aluminum 2.4-2.6; cobalt 0.4-0.6; tantalum 0.4-0.6; iron is the rest.