FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, in particularly to nodular iron. Cast iron contains the following in wt %: silicon 2.0-4.5, carbon 2.9-4.0, niobium 0.05-0.7, molybdenum 0.3-1.5, optionally cobalt 0.1-2.0, manganese ≤ 0.3, nickel ≤ 0.5, magnesium ≤ 0.7, phosphorus ≤ 0.05, sulphur ≤ 0.012, chrome ≤ 0.1, stibium ≤ 0.004, iron - rest. Structural element made out of cast iron is part of casing, in particular, of steam or gas turbine.
EFFECT: cast iron is characterised by increased mechanical properties, in particular by increased creep stress, scale resistance, and low-cycle fatigue resistance.
18 cl, 2 dwg, 1 tbl
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