Nodular cast iron material for draught fan and preparation method and application of nodular cast iron for draught fan
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A technology of ductile iron and fans, which is applied in mechanical equipment, wind engines, machines/engines, etc. It can solve problems such as yield strength, tensile strength and impact energy that are difficult to meet the development requirements of the fan industry, bulky, and complex structures. , to achieve the effect of simple structure, simple process operation and low cost
Inactive Publication Date: 2021-02-12
GUODIAN UNITED POWER TECH
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[0004] The national standard GB1348-2009 has made corresponding requirements on the performance and impact energy of nodular cast iron QT400-18AL. It has been difficult to meet the development requirements of the fan industry. Therefore, with the continuous development and progress of fan technology, it is also necessary to make new technical improvements to the original QT400-18AL material, so that it can meet the requirements of complex structures in different environments. The need for bulky casting products
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Embodiment 1
[0028] Pig iron is mainly used as the material, and the elemental composition of the ductile iron material: carbon 3.85%, manganese 0.19%, silicon 2.03%, phosphorus 0.003%, sulfur 0.022%, nickel 1.65%, antimony 0.002%, magnesium 0.03%, RE 0.03%, The rest is iron and impurities from the preparation process.
[0029] Prepare the ductile iron material according to the above recipe. First smelting, the temperature of the molten iron is controlled at 1420-1450°C. After the spheroidization treatment, the spheroidizer (FeSiMg 8 RE 3 ) in an amount of 1.0-1.2%, and the spheroidizing temperature is 1420-1450°C.
[0030] After pouring, slowly cool in the sand mold to 350-400°C and clear out from the mold.
Embodiment 2
[0032] Pig iron is mainly used as the material, and the elemental composition of the ductile iron material: carbon 3.85%, manganese 0.19%, silicon 2.03%, phosphorus 0.003%, sulfur 0.022%, nickel 1.20%, antimony 0.005%, magnesium 0.03%, RE 0.03%, The rest is iron and impurities from the preparation process.
[0033] Prepare the ductile iron material according to the above recipe. First smelting, the temperature of the molten iron is controlled at 1420-1450°C. After the spheroidizing treatment, the addition amount of the spheroidizing agent (FeSiMg8RE3) is 1.0-1.2%, and the spheroidizing temperature is 1420-1450°C.
[0034] After pouring, slowly cool in the sand mold to 350-400°C and clear out from the mold.
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Abstract
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.
Description
technical field [0001] The invention relates to the field of wind turbines, in particular to a ductile iron material for a fan, a preparation method and application of the ductile iron for a fan. Background technique [0002] As the wind power market expands year by year and the technical level continues to improve, the power generation of a single wind turbine also continues to increase. Therefore, wind power components made of cast iron are also developing towards larger sizes and larger tonnages. [0003] In the mainstream fan design, most of the castings are made of ductile iron for processing and casting. Such as hubs, bearing housings, machine bases and other components. In addition to meeting the low-temperature toughness of castings, that is, certain requirements for impact energy at low temperatures, these components also need to further improve the performance of metal materials while ensuring the overall performance of fan castings, which has met the design requ...
Claims
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