RU2419670C1 - Iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: iron contains components at following ratio, wt %: carbon 2.2-2.8; silicon 0.6-0.8; manganese 0.8-1.2; chromium 14.0-16.0; molybdenum 0.1-0.15; aluminium 2.3-2.7; copper 0.5-0.7; hafnium 0.5-0.7; silver 0.002-0.003; iron - the rest.

EFFECT: raised heat resistance of iron.

1 tbl

Description

The invention relates to the field of metallurgy, and in particular to compositions of white cast iron, which can be used for the manufacture of burners of gas stoves, parts of furnaces.

Known cast iron, containing, wt.%: Carbon 2.2-3.0; silicon 0.5-0.8; manganese 0.5-0.8; chrome 14.0-16.0; titanium 0.3-0.5; molybdenum 0.2-0.6; aluminum 0.5-1.0; copper 1.5-2.0; 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 containing carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, iron, additionally contains hafnium and silver in the following ratio of components, wt.%: Carbon 2.2-2.8; silicon 0.6-0.8; manganese 0.8-1.2; chrome 14.0-16.0; molybdenum 0.1-0.15; aluminum 2.3-2.7; copper 0.5-0.7; hafnium 0.5-0.7; silver 0.002-0.003; iron is the rest.

The table shows the composition of cast iron.

Table Components Content, wt.% In the compositions one 2 3 Carbon 2.2 2.5 2,8 Silicon 0.8 0.7 0.6 Manganese 1,2 1,0 0.8 Chromium 14.0 15.0 16,0 Molybdenum 0.15 0.12 0.1 Aluminum 2,3 2.5 2.7 Copper 0.7 0.6 0.5 Hafnium 0.5 0.6 0.7 Silver 0.003 0.0025 0.002 Iron rest rest rest

Heat resistance (heating to 800 ° C - cooling in air) of cast iron will be ~ 2500 cycles to failure.

In the composition of cast iron components manifest themselves as follows. Hafnium and molybdenum strengthen the solid solution. Aluminum and chromium inhibit the growth of scale. Copper, aluminum and silver contribute to uniform heating and cooling of cast iron products. Silver helps to chop grain.

Cast iron is smelted in electric furnaces and cast into hot (400-450 ° C) metal molds coated with refractory clay. To relieve internal stresses, castings are annealed at a temperature of 550 ° C.

Information sources

1. Copyright certificate No. 1008270 of the USSR, 1983.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, iron, characterized in that it additionally contains hafnium and silver in the following ratio, wt.%:
carbon 2.2-2.8 silicon 0.6-0.8 manganese 0.8-1.2 chromium 14.0-16.0 molybdenum 0.1-0.15 aluminum 2.3-2.7 copper 0.5-0.7 hafnium 0.5-0.7 silver 0.002-0.003 iron rest