RU2447179C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed composition contains the following substances, in wt %: carbon - 3.0-3.5; silicon - 1.3-1.9; manganese - 0.5-1.0; vanadium - 0.5-0.7; molybdenum - 0.2-0.3; stibium - 0.001-0.002; hafnium - 0.5-0.9; nickel - 0.7-1.3; aluminium - 0.1-0.15; boron - 0.05-0.09; iron making the rest.

EFFECT: higher strength.

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Description

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

Known cast iron, containing, wt.%: Carbon 3.0-3.4; silicon 1.6-2.2; manganese 0.005-0.04; vanadium 0.05-0.14; molybdenum 0.1-0.4; antimony 0.05-0.1; hafnium 0.14-0.27; 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, vanadium, molybdenum, antimony, hafnium, iron, additionally includes nickel, aluminum, boron in the following ratio of components, wt.%: Carbon 3.0-3.5; silicon 1.3-1.9; manganese 0.5-1.0; vanadium 0.5-0.7; molybdenum 0.2-0.3; antimony 0.001-0.002; hafnium 0.5-0.9; nickel 0.7-1.3; aluminum 0.1-0.15; boron 0.05-0.09; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 3,5 3.3 3.0 Silicon 1.9 1,6 1.3 Manganese 1,0 0.8 0.5 Vanadium 0.5 0.6 0.7 Molybdenum 0.2 0.25 0.3 Antimony 0.002 0.0015 0.001 Hafnium 0.5 0.7 0.9 Nickel 0.7 1,0 1.3 Aluminum 0.15 0.13 0.1 Boron 0.05 0,07 0.09 Iron rest rest rest Tensile Strength, MPa not less than 800 not less than 800 not less than 800

The increase in the strength of cast iron is due to the complex effect of the components that make up its composition. Manganese provides increased hardness of cast iron. Molybdenum, hafnium, nickel, vanadium increase the strength of cast iron. Vanadium, aluminum deoxidizes the alloy. Antimony and boron contribute to the formation of a fine-grained structure of the alloy, increase the hardness and strength of the alloy. Boron stabilizes carbides.

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

Information sources

1. SU 1359327, C22C 37/00, 1986.

Claims (1)

Cast iron containing carbon, silicon, manganese, vanadium, molybdenum, antimony, hafnium, iron, characterized in that it additionally contains nickel, aluminum, boron in the following ratio of components, wt.%: Carbon 3.0-3.5; silicon 1.3-1.9; manganese 0.5-1.0; vanadium 0.5-0.7; molybdenum 0.2-0.3; antimony 0.001-0.002; hafnium 0.5-0.9; nickel 0.7-1.3; aluminum 0.1-0.15; boron 0.05-0.09; iron is the rest.