RU2303643C1 - Cast iron - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: invention provides cat iron comprising following components, wt %: carbon 3.6-4.2, silicon 0.8-1.2, manganese 0.8-1.2, crr 0.3-0.8, barium 0.001-0.002, molybdenum 2.0-3.0, nickel 1.0-1.5, calcium 0.04-0.08, and iron - the balance.

EFFECT: increased heat resistance of cast iron.

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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 power engineering.

Known cast iron, containing, wt.%: Carbon 4.1-4.5; silicon 0.8-1.2; manganese 0.5-1.0; chrome 0.12-0.3; barium 0.001-0.005; iron - the rest [1].

Cast iron is also known, containing, wt.%: Carbon 2.0-2.8; silicon 0.7-2.5; manganese 0.3-1.2; chrome 0.1-1.0; barium 0-0.2; molybdenum 0-0.7; nickel 0-3.0; calcium 0-0.2; iron - the rest [2].

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

The technical result is achieved by the fact that in the composition of cast iron containing carbon, silicon, manganese, chromium, barium, molybdenum, nickel, calcium, iron, the components are in the following ratio, wt.%: Carbon 3,6-4,2; silicon 0.8-1.2; manganese 0.8-1.2; chrome 0.3-0.8; barium 0.001-0.002; molybdenum 2.0-3.0; nickel 1.0-1.5; calcium 0.04-0.08; iron is the rest.

The table shows examples of cast iron compositions.

Table Components Content, wt.% In the compositions one 2 3 Carbon 3.6 3.8 4.2 Silicon 1,2 1,0 0.8 Manganese 1,2 1,0 0.8 Chromium 0.3 0.5 0.8 Barium 0.001 0.0015 0.002 Molybdenum 3.0 2,5 2.0 Nickel 1,0 1,2 1,5 Calcium 0.08 0.06 0.04 Iron rest rest rest Heat resistance cycles ~ 150 ~ 150 ~ 150

The increase in heat resistance of cast iron is ensured by its fine-grained needle structure, formed due to the complex introduction of molybdenum, chromium and nickel, while calcium and barium serve as deoxidizing agents.

Cast iron is smelted in electric furnaces and molds are cast. The castings are subjected to low-temperature annealing at a temperature of 600 ° C to relieve linear stresses.

Cast iron works satisfactorily at temperatures up to 450 ° C.

Information sources

1. A.S. USSR No. 1686022, 1991.

2. Application No. 60-121254 of Japan, 1985.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, barium, molybdenum, nickel, calcium, iron, characterized in that it contains components in the following ratio, wt.%: Carbon 3,6-4,2; silicon 0.8-1.2; manganese 0.8-1.2; chrome 0.3-0.8; barium 0.001-0.002; molybdenum 2.0-3.0; nickel 1.0-1.5; calcium 0.04-0.08; iron is the rest.