RU2459003C1 - Cast-iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast-iron contains the following, wt %: carbon 2.8-3.2; silicone 0.8-1.2; manganese 1.0-1.2; copper 3.0-3.2; cerium 0.01-0.015; boron 0.03-0.04; niobium 0.8-1.2; nitrogen 0.0001-0.00015; cobalt 0.2-0.3; aluminium 0.1-0.15; iron is the rest.

EFFECT: increasing cast-iron strength.

1 tbl

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 2.8-3.2; silicon 1.75-2.5; manganese 0.3-0.8; copper 0.6-1.5; magnesium 0.03-0.08; cerium 0.03-0.08; boron 0.008-0.02; niobium 0.03-0.1; nitrogen 0.03-0.1; 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, copper, cerium, boron, niobium, nitrogen, iron, additionally includes cobalt and aluminum, and the components are in the following ratio, wt.%: Carbon 2.8-3 , 2; silicon 0.8-1.2; manganese 1.0-1.2; copper 3.0-3.2; cerium 0.01-0.015; boron 0.03-0.04; niobium 0.8-1.2; nitrogen 0.0001-0.00015; cobalt 0.2-0.3; aluminum 0.1-0.15; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.% one 2 3 Carbon 2,8 3.0 3.2 Silicon 1,2 1,0 0.8 Manganese 1,2 1,1 1,0 Copper 3.0 3,1 3.2 Cerium 0.01 0.012 0.015 Boron 0,03 0,035 0.04 Niobium 1,2 1,0 0.8 Nitrogen 0.00015 0.00012 0.0001

Table continuation Components Composition, wt.% one 2 3 Cobalt 0.2 0.25 0.3 Aluminum 0.15 0.13 0.1 Iron rest rest rest Tensile strength, kg / mm ² ~ 90 ~ 90 ~ 90

The components present in the composition of cast iron manifest themselves as follows. Niobium and cobalt harden the alloy. Nitrogen, forming nitrides, becomes an alloying element that improves the structure of cast iron. Copper helps to increase the strength of the alloy. Aluminum and cerium deoxidize cast iron. Boron stabilizes carbides, increases the hardness and strength of the alloy.

Cast iron is smelted in electric furnaces and cast into hot (400-500 ° C) metal molds. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. SU 1041599, C22C 37/10, 1983.

Claims (1)

Cast iron containing carbon, silicon, manganese, copper, cerium, boron, niobium, nitrogen, iron, characterized in that it additionally contains cobalt and aluminum in the following ratio of components, wt.%: Carbon 2.8-3.2; silicon 0.8-1.2; manganese 1.0-1.2; copper 3.0-3.2; cerium 0.01-0.015; boron 0.03-0.04; niobium 0.8-1.2; nitrogen 0.0001-0.00015; cobalt 0.2-0.3; aluminum 0.1-0.15; iron is the rest.