RU2458173C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains the following, wt %: carbon 3.6-4.2; silicium 0.8-1.2; manganese 2.8-3.2; chrome 0.1-0.2; barium 0.007-0.011; stannum 0.007-0.011; cuprum 4.8-5.2; niobium 0.4-0.6; ferrum - the rest.

EFFECT: increasing cast iron 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 in the following ratio of components, wt.%: Carbon 3,6-4,2; silicon 0.8-1.2; manganese 2.8-3.2; chrome 0.1-0.2; barium 0.007-0.011; tin 0.007-0.011; copper 4.8-5.2; niobium 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 3.6 3.8 4.2 Silicon 1,2 1,0 0.8 Manganese 3.2 3.0 2,8 Chromium 0.1 0.15 0.2 Barium 0.011 0.009 0.007 Tin 0.011 0.009 0.007 Copper 5.2 5,0 4.8 Niobium 0.4 0.5 0.6 Iron rest rest rest Heat resistance (heating to 450 ° С - cooling to 20 ° С in water), cycles ~ 150 ~ 150 ~ 150

In the composition of cast iron, the components manifest themselves as follows. Chrome stabilizes carbides. Barium deoxidizes cast iron. Tin provides the alloy with fine grain. Copper promotes uniform heating and cooling of products. Niobium prevents the formation and development of cracks at temperature extremes.

Cast iron is smelted in electric furnaces and cast in sand forms. The temperature of the melt when casting molds should be at least 1330 ° C. The castings are annealed at a temperature of 720-740 ° C, followed by cooling in air.

Information sources

1. JP 61-026754 A, 1986.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, barium, tin, copper, iron, characterized in that it additionally contains niobium in the following ratio of components, wt.%: Carbon 3,6-4,2; silicon 0.8-1.2; manganese 2.8-3.2; chrome 0.1-0.2; barium 0.007-0.011; tin 0.007-0.011; copper 4.8-5.2; niobium 0.4-0.6; iron the rest.