RU2491364C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains, wt %: carbon 3.6-4.2; silicon 0.8-1.2; manganese 0.8-1.2; chrome 0.08-0.12; barium 0.001-0.002; tin 0.001-0.002; copper 4.2-4.6; niobium 0.7-1.1; boron 0.3-0.4; iron - balance.

EFFECT: increased thermal resistance.

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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 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; chrome 0-1.5; barium 0-0.2; tin 0-0.5; copper 0-4.0; iron - the rest [1].

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, chromium, barium, tin, copper, iron, further includes niobium and boron in the following ratio of components, wt.%: Carbon 3,6-4,2; silicon 0.8-1.2; manganese 0.8-1.2; chrome 0.08-0.12; barium 0.001-0.002; tin 0.001-0.002; copper 4.2-4.6; niobium 0.7-1.1; boron 0.3-0.4; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 3.6 3.8 4.2 Silicon 1,2 1,0 0.8 Manganese 1.2 1,0 0.8 Chromium 0.08 0.1 0.12 Barium 0.002 0.0015 0.001 Tin 0.001 0.0015 0.002 Copper 4.6 4.4 4.2 Niobium 0.7 0.9 1,1 Boron 0.4 0.35 0.3 Iron rest rest rest Heat resistance (heating to 450 ° C - cooling to 20 ° C in water), cycles ~ 150 ~ 150 ~ 150

In the composition of cast iron, the components manifest themselves as follows. Chrome stabilizes carbides, increases the hardness of cast iron, slightly inhibits the growth of scale. Barium deoxidizes cast iron. Copper, tin, niobium, boron prevent the formation of cracks at temperature extremes, increases the strength and ductility of the alloy.

Cast iron is smelted in electric furnaces and cast in sand forms. The castings are annealed at a temperature of 860-880 ° C, followed by cooling in air.

Information sources

1.JP 61-026754, 1986.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, barium, tin, copper, iron, characterized in that it additionally contains niobium and boron in the following ratio of components, wt.%: Carbon 3,6-4,2, silicon 0, 8-1.2, manganese 0.8-1.2, chromium 0.08-0.12, barium 0.001-0.002, tin 0.001-0.002, copper 4.2-4.6, niobium 0.7-1, 1, boron 0.3-0.4, iron - the rest.