RU2643767C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy, in particular to cast iron compositions, which can be used for manufacture of furnaces parts, thermal aggregates, metallurgical equipment. Cast iron contains, by wt %: carbon 3.0–3.5; silicon 0.5–1.0; manganese; 0.4–0.6; aluminum 0.5–0.9; nickel 0.3–0.4; cobalt 0.1–0.15; boron 0.06–0.1; molybdenum 0.1–0.15; vanadium 0.1–0.15; silver 0.003–0.008; iron – the rest.

EFFECT: technical result is higher heat resistance of cast iron.

1 cl, 1 tbl

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 furnaces, thermal units, metallurgical equipment.

Known cast iron of the following composition, wt.%: Carbon 3.0-4.5; silicon 0.5-1.8; manganese 0.1-0.6; magnesium 0.03-0.1; aluminum 0.5-0.9; 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, including carbon, silicon, manganese, aluminum, iron, additionally contains nickel, cobalt, boron, molybdenum, vanadium, silver in the following ratio of components, wt.%: Carbon 3.0-3.5; silicon 0.5-1.0; manganese 0.4-0.6; aluminum 0.5-0.9; nickel 0.3-0.4; cobalt 0.1-0.15; boron 0.06-0.1; molybdenum 0.1-0.15; vanadium 0.1-0.15; silver 0.003-0.008; iron is the rest.

The table shows the composition of cast iron.

In the composition of cast iron, the components manifest themselves as follows. Nickel, cobalt, molybdenum, vanadium increase the strength, hardness and heat resistance of cast iron. Aluminum, vanadium increase the viscosity of the alloy, prevent the formation of cracks at temperature extremes, reduce the formation of scale. Boron stabilizes carbides. Boron and silver contribute to uniform heating and cooling of cast iron.

Cast iron is smelted in electric furnaces and molds are cast. Castings are annealed at a temperature of 800-820 ° C, followed by cooling in air.

Information sources

1. SU 550454, C22C 37/10, 1977.

Claims (1)

Cast iron containing carbon, silicon, manganese, aluminum and iron, characterized in that it additionally contains nickel, cobalt, boron, molybdenum, vanadium and silver in the following ratio of components, wt.%: Carbon 3.0-3.5; silicon 0.5-1.0; manganese 0.4-0.6; aluminum 0.5-0.9; nickel 0.3-0.4; cobalt 0.1-0.15; boron 0.06-0.1; molybdenum 0.1-0.15; vanadium 0.1-0.15; silver 0.003-0.008; iron is the rest.