RU2492264C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed composition contains the following substances, in wt %: carbon - 3.2-3.6, silicon - 1.2-1.8, manganese - 0.4-0.6, aluminium - 0.4-0.6, calcium - 0.0002-0.0004, barium - 0.002-0.004, chromium - 0.02-0.04, copper - 2.3-2.7, hafnium - 1.3-1.7, iron making the rest.

EFFECT: higher strength.

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Description

The invention relates to the field of ferrous metallurgy, in particular to compositions of cast iron, used mainly for the production of large castings.

Known cast iron, containing, wt.%: Carbon 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; aluminum 0-0.2; calcium 0-0.2; barium 0-0.2; chrome 0-1.5; copper 0-4.0; 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, aluminum, calcium, barium, chromium, copper, iron, additionally contains hafnium and cobalt in the following ratio of components, wt.%: Carbon 3,2-3,6; silicon 1.2-1.8; manganese 0.4-0.6; aluminum 0.4-0.6; calcium 0.0002-0.0004; barium 0.002-0.004; chrome 0.02-0.04; copper 2.3-2.7; hafnium 1.3-1.7; cobalt 0.4-0.6; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 3.2 3.43 3.6 Silicon 1.8 1,5 1,2 Manganese 0.6 0.5 0.4 Aluminum 0.6 0.5 0.4 Calcium 0,0002 0,0003 0,0004 Barium 0.004 0.003 0.002 Chromium 0.02 0,03 0.04 Copper 2.7 2,5 2,3 Hafnium 1.7 1,5 1.3 Cobalt 0.4 0.5 0.6 Iron rest rest rest Tensile Strength, MPa ~ 600 ~ 600 ~ 600

In the composition of cast iron, the components manifest themselves as follows. Copper, hafnium, cobalt increase the strength of cast iron. Chrome stabilizes carbides. Aluminum, calcium and barium act as deoxidizers.

Cast iron is smelted in electric furnaces and centrifugally cast in hot (400-500 ° C) metal molds coated with refractory clay. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. JP 60-121254, 1985.

Claims (1)

Cast iron containing carbon, silicon, manganese, aluminum, calcium, barium, chromium, copper, iron, characterized in that it additionally contains hafnium and cobalt in the following ratio, wt.%:
carbon 3.2-3.6 silicon 1.2-1.8 manganese 0.4-0.6 aluminum 0.4-0.6 calcium 0,0002-0,0004 barium 0.002-0.004 chromium 0.02-0.04 copper 2.3-2.7 hafnium 1.3-1.7 cobalt 0.4-0.6 iron rest