RU2499071C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast-iron contains the following, wt %: carbon 3.0-3.6; silicon 3.0-3.6; manganese 0.4-0.6; molybdenum 0.1-0.2; copper 1.4-1.8; niobium 0.1-0.2; aluminium 0.1-0.2; boron 0.1-0.14; cobalt 1.2-1.4; iron is 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 for the manufacture of parts of thermal units, furnaces.

Known cast iron of the following composition, wt.%: Carbon 3.0-3.8; silicon 3.0-3.5; manganese 0.1-0.6; molybdenum 0.1-0.2; magnesium 0.03-0.08; copper 0.2-0.6; cerium 0.05-0.1; iron - the rest [1].

The objective of the invention is to increase the heat resistance of cast iron.

The technical result is achieved in that the cast iron containing carbon, silicon, manganese, molybdenum, copper, additionally contains niobium, aluminum, boron and cobalt in the following ratio of components, wt.%: Carbon 3.0-3.6; silicon 3.0-3.6; manganese 0.4-0.6; molybdenum 0.1-0.2; copper 1.4-1.8; niobium 0.1-0.2; aluminum 0.1-0.2; boron 0.1-0.14; cobalt 1.2-1.4; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 3.0 3.3 3.6 Silicon 3.0 3.3 3.6 Manganese 0.6 0.5 0.4 Molybdenum 0.2 0.15 0.1 Copper 1.4 1,6 1.8 Niobium 0.1 0.15 0.2 Aluminum 0.2 0.15 0.1 Boron 0.14 0.12 0.1 Cobalt 1,2 1.3 1.4 Iron rest rest rest Heat resistance of cast iron (heating to 850 ° C - cooling to 20 ° C), cycles until cracks appear 230-235 230-235 230-235

In the composition of cast iron, the components manifest themselves as follows. Molybdenum, niobium, cobalt, copper increase the strength characteristics of cast iron, hardness, and prevent the formation of cracks at temperature extremes. Boron and copper contribute to uniform heating and cooling of cast iron products. Aluminum acts as a deoxidizer.

Cast iron is smelted in electric furnaces and cast into hot (400-450 ° C) metal molds coated with refractory clay. To relieve internal stresses, castings are annealed at a temperature of 550 ° C.

Information sources

1. SU 981428, C22C 37/10, 1982.

Claims (1)

Cast iron containing carbon, silicon, manganese, molybdenum, copper, characterized in that it additionally contains niobium, aluminum, boron and cobalt in the following ratio of components, wt.%: Carbon 3.0-3.6; silicon 3.0-3.6; manganese 0.4-0.6; molybdenum 0.1-0.2; copper 1.4-1.8; niobium 0.1-0.2; aluminum 0.1-0.2; boron 0.1-0.14; cobalt 1.2-1.4; iron is the rest.