RU2350681C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention can be used in mechanical engineering. Cast iron contains, wt %: carbon 2.9-3.3; silicon 0.8-1.2; manganese 0.3-0.7; nickel 1.5-2.0; barium 0.005-0.01; cerium 0.05-0.1; antimony 0.005-0.01; cobalt 0.5-0.7; silver 0.005-0.01; strontium 0.005-0.01; boron 0.05-0.1; iron - the rest.

EFFECT: cast iron allows high strength.

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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 2.95-3.45; silicon 1.55-2.2; manganese 0.3-0.7; nickel 0.02-0.8; barium 0.012-0.05; an element from the group of cerium, antimony, tin, cobalt 0.05-0.3; chromium nitrides 0.02-0.3; 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, nickel, barium, cerium, antimony, cobalt, iron, additionally includes silver, strontium, boron in the following ratio of components, wt.%: Carbon 2.9-3, 3; silicon 0.8-1.2; manganese 0.3-0.7; nickel 1.5-2.0; barium 0.005-0.01; cerium 0.05-0.1; antimony 0.005-0.01; cobalt 0.5-0.7; silver 0.005-0.01; strontium 0.005-0.01; boron 0.05-0.1; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 2.9 3,1 3.3 Silicon 1,2 1,0 0.8 Manganese 0.3 0.5 0.7 Nickel 1,5 1.7 2.0 Barium 0.01 0.008 0.005 Cerium 0.05 0.08 0.1 Antimony 0.01 0.008 0.005 Cobalt 0.5 0.6 0.7 Silver 0.005 0.008 0.01 Strontium 0.005 0.008 0.01 Boron 0.1 0.08 0.05 Iron rest rest rest Tensile strength, MPa -850 -850 -850

The increase in the strength of cast iron is achieved due to the complex effect of the components included in its composition. Boron stabilizes carbides. Nickel and cobalt harden the solid solution. Barium and cerium act as deoxidizing agents and inhibit grain growth. The presence of cerium neutralizes the harmful effects of sulfur impurities. Antimony and silver contribute to the grinding of grain, reduces the number of gas inclusions in the alloy.

Cast iron products can be centrifugally cast in a chill mold, heated to a temperature of 400-450 ° C. Castings are subjected to normalization at a temperature of 930-950 ° C and tempering at a temperature of 700-720 ° C.

Information sources

1. SU 1507845, C22C 37/08, 1989.

Claims (1)

Cast iron containing carbon, silicon, manganese, nickel, barium, cerium, antimony, cobalt, iron, characterized in that it additionally contains silver, strontium, boron in the following ratio of components, wt.%:
carbon 2.9-3.3 silicon 0.8-1.2 manganese 0.3-0.7 nickel 1.5-2.0 barium 0.005-0.01 cerium 0.05-0.1 antimony 0.005-0.01 cobalt 0.5-0.7 silver 0.005-0.01 strontium 0.005-0.01 boron 0.05-0.1 iron rest