RU2333278C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field. Particularly it concerns cast iron content. Cast iron contents components at a following ratio, mass %: carbon 2.8-3.2; silicon 1.4-1.8; manganese 0.8-1.2; nickel 0.8-1.2; chrome 0.2-0.4; copper 0.4-0.8; cobalt 0.8-1.2; niobium 0.8-1.2; vanadium 0.8-1.2; molybdenum 1.8-2.2; nitrogen 0.1 -0.2; iron - the rest.

EFFECT: cast iron hardening.

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Description

The invention relates to the field of metallurgy and relates to compositions of gray cast iron, which can be used in general engineering.

Known cast iron, containing, wt.%: Carbon 1.7-3.8; silicon 0.01-2.5; manganese 0.01-1.0; nickel 0.01-5.0; chromium 0.01-2.0; copper 0-0.2; cobalt 0.01-5.0; niobium 0.001-0.1; vanadium 0.001 -1.0; molybdenum 0.01-2.0; 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, chromium, copper, cobalt, niobium, vanadium, molybdenum, iron, additionally includes nitrogen in the following ratio of components, wt.%: Carbon 2,8-3, 2; silicon 1.4-1.8; manganese 0.8-1.2; nickel 0.8-1.2; chrome 0.2-0.4; copper 0.4-0.8; cobalt 0.8-1.2; niobium 0.8-1.2; vanadium 0.8-1.2; molybdenum 1.8-2.2; nitrogen 0.1-0.2; 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 1.8 1,6 1.4 Manganese 0.8 1,0 1,2 Nickel 1,2 1,0 0.8 Chromium 0.2 0.3 0.4 Copper 0.8 0.6 0.4 Cobalt 0.8 1,0 1,2 Niobium 0.8 1,0 1,2 Vanadium 1,2 1,0 0.8 Molybdenum 2.2 2.0 1.8 Nitrogen 0.2 0.15 0.1 Iron rest rest rest Tensile strength, MPa 800-820 800-820 800-820

The increase in the strength of cast iron is due to the complex effect of the components that make up its composition. Chrome stabilizes carbides. Molybdenum, cobalt and niobium strengthen the solid solution. Copper increases the content of perlite in the alloy. Manganese inhibits the release of graphite and contributes to the crushing of perlite. Nickel increases the strength and plastic properties of the alloy. In a chemically bound state with vanadium and niobium, nitrogen, forming nitrides, becomes an alloying element that improves the structure and mechanical properties of cast iron.

Cast iron is smelted in cupola furnaces, by a duplex process or in electric furnaces, and molds are cast. The castings are annealed at a temperature of 720-740 ° C, followed by cooling in air.

Information sources

1. GB 1149401 A, C22C 37/06, 1969.

Claims (1)

Cast iron containing carbon, silicon, manganese, nickel, chromium, copper, cobalt, niobium, vanadium, molybdenum, iron, characterized in that it additionally contains nitrogen in the following ratio, wt.%: Carbon 2,8-3,2 ; silicon 1.4-1.8; manganese 0.8-1.2; nickel 0.8-1.2; chrome 0.2-0.4; copper 0.4-0.8; cobalt 0.8-1.2; niobium 0.8-1.2; vanadium 0.8-1.2; molybdenum 1.8-2.2; nitrogen 0.1-0.2; iron is the rest.