RU2494163C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed composition contains the following substances, in wt %: carbon - 3.0-3.4, silicon - 0.5-1.0, manganese - 0.5-1.0, magnesium - 0.005-0.01, aluminium - 0.02-0.04, tantalum - 1.1-1.5, boron - 0.7-0.9, tungsten - 4.4-4.8, iron making the rest.

EFFECT: higher heat resistance.

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Description

The invention relates to the field of ferrous metallurgy, and in particular to compositions of cast iron, which can be used for the manufacture of parts of thermal units, furnaces.

Known cast iron, including, wt.%: Carbon 1.5-4.0; silicon 1.5-6.0; manganese 0.05-2.5; magnesium 0-0.5; aluminum 0.1-2.0; tantalum 0.1-4.0; boron 0-0.5; tungsten 0.1-4.0; 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 in cast iron containing carbon, silicon, manganese, magnesium, aluminum, tantalum, boron, tungsten, iron, the components are in the following ratio, wt.%: Carbon 3.0-3.4; silicon 0.5-1.0; manganese 0.5-1.0; magnesium 0.005-0.01; aluminum 0.02-0.04; tantalum 1.1-1.5; boron 0.7-0.9; tungsten 4.4-4.8; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 3.0 3.2 3.4 Silicon 1,0 0.8 0.5 Manganese 1,0 0.8 0.5 Magnesium 0.01 0.008 0.005 Aluminum 0.02 0,03 0.04 Tantalum 1,1 1.3 1,5 Boron 0.9 0.8 0.7 Tungsten 4.4 4.6 4.8 Iron rest rest rest Heat resistance of cast iron (heating to 550 ° C by high-frequency currents and cooling in water at 20 ° C), cycles ~ 450 ~ 450 ~ 450

In the composition of cast iron, the components manifest themselves as follows. Tantalum and tungsten increase the strength and hardness of cast iron, prevent cracking during temperature changes. Boron stabilizes carbides, provides uniform heating and cooling of alloy products. Aluminum and magnesium deoxidize cast iron.

Cast iron is smelted in electric furnaces and cast into chill molds coated with refractory clay, preheated to a temperature of 350-450 ° C. The castings are annealed at a temperature of 580-600 ° C, followed by cooling in air.

Information sources

1. GB 1482724 A, C22C 37/04, 1977.

Claims (1)

Cast iron containing carbon, silicon, manganese, magnesium, aluminum, tantalum, boron, tungsten, iron, characterized in that it contains components in the following ratio, wt.%: Carbon 3.0-3.4; silicon 0.5-1.0; manganese 0.5-1.0; magnesium 0.005-0.01; aluminum 0.02-0.04; tantalum 1.1-1.5; boron 0.7-0.9; tungsten 4.4-4.8; iron is the rest.