RU2380448C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains components in a following ratio, wt %: carbon 2.8-3.2; silicon 2.8-3.2; manganese 0.8-1.2; magnesium 0.001-0.002; aluminium 0.7-0.9; nickel 7.0-9.0; vanadium 2.2-2.6; boron 0.0005-0.0007; cobalt 0.6-0.8; iron - the rest.

EFFECT: hardening 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 2.7-4.0; silicon 0.5-3.5; manganese 0.2-2.0; magnesium 0.001-0.5; aluminum 0.001-0.5; nickel 2.5-7.0; vanadium 0.2-1.8; boron 0.001-0.5; cobalt 0.001-0.5; iron - the rest [1].

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

The technical result is achieved in that in cast iron containing carbon, silicon, manganese, magnesium, aluminum, nickel, vanadium, boron, cobalt, iron, the components are in the following ratio, wt.%: Carbon 2.8-3.2; silicon 2.8-3.2; manganese 0.8-1.2; magnesium 0.001-0.002; aluminum 0.7-0.9; nickel 7.0-9.0; vanadium 2.2-2.6; boron 0,0005-0,0007; cobalt 0.6-0.8; 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 2,8 3.0 3.2 Manganese 1,2 1,0 0.8 Magnesium 0.001 0.0015 0.002 Aluminum 0.7 0.8 0.9 Nickel 7.0 8.0 9.0 Vanadium 2.6 2,4 2.2 Boron 0,0005 0,0006 0,0007 Cobalt 0.6 0.7 0.8 Iron rest rest rest Tensile Strength, kgf / mm ² 86-88 86-88 86-88

In the composition of cast iron, the components manifest themselves as follows. Nickel and cobalt improve the metal base of the alloy, prevent bleaching. Nickel increases the hardness of the alloy. Aluminum and vanadium increase the viscosity of cast iron. Vanadium strengthens the solid solution. Boron stabilizes carbides, contributes to the grinding of grain. Magnesium deoxidizes cast iron.

Cast iron is smelted in electric furnaces and cast into a chill mold, heated to a temperature of 350-450 ° C, coated with refractory clay. The castings are subjected to normalization at a temperature of 930-950 ° C and tempering at a temperature of 700-720 ° C, and then pre-machined. To relieve stresses that occurred during machining, castings are annealed at a temperature of 580-620 ° C and nitrided at a temperature of 520-530 ° C for 80-85 hours.

Information sources

1. Application No. 2002-180176 of Japan, 2002.

Claims (1)

Cast iron containing carbon, silicon, manganese, magnesium, aluminum, nickel, vanadium, boron, cobalt, iron, characterized in that the components are contained in the following ratio, wt.%: Carbon 2.8-3.2; silicon 2.8-3.2; manganese 0.8-1.2; magnesium 0.001-0.002; aluminum 0.7-0.9; nickel 7.0-9.0; vanadium 2.2-2.6; boron 0,0005-0,0007; cobalt 0.6-0.8; iron is the rest.