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FIELD : metallurgy.SUBSTANCE : invention relates to ferrous metallurgy field, particularly, content of cast iron, used for manufacturing of details of thermal aggregate, internal combustion engine. Cast iron contains, wt % : carbon 3.0-3.4; silicon 1.4-2.0; manganese 0.2-0.3; rare-earth metals 0.1-0.15; nickel 3.0-4.0; cobalt 3.0-4.0; silver 0.2-0.4; strontium 0.001-0.002, iron - the rest.EFFECT : increasing of cast iron heat stability.1 tbl