The invention discloses a nodular
cast iron material for a draught fan and a preparation method and application of the nodular
cast iron material for the draught fan, and belongs to the field of windturbines. The nodular
cast iron material for the draught fan comprises, by
mass, 3.5-3.9 % of carbon, less than or equal to 0.2 % of
manganese, less than or equal to 2.3 % of
silicon, less than or equal to 0.003 % of
phosphorus, less than or equal to 0.025 % of
sulfur, less than or equal to 1.7 % of
nickel, less than or equal to 0.005 % of
antimony, less than or equal to 0.05 % of
magnesium residues, less than or equal to 0.03 % of RE residues and the balance iron and impurities generated in the preparation process. Compared with the prior art, by means of the obtained nodular cast iron, the proportion content of each component is precise, and therefore each performance of the QT400-18AL nodular cast iron in an ultralow-temperature environment can be improved. The nodular cast iron is optimized QT400-18AL nodular cast iron, and by changing the percentage content of the nodular cast iron composition, the applicability of the material is enhanced, and the nodular cast iron material stillmaintains the excellent characteristics of high strength and high
toughness of the nodular cast iron in a large-section, high-
tonnage and ultralow-temperature (-40 DEG C) environment.