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Preparation method of megawatt wind power high-strength high-toughness low-temperature (-30 DEG C) spheroidal graphite iron casting

A technology of nodular cast iron, high strength and high toughness, applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of long production cycle, complex structure and large size of wind power castings, and achieve the effect of low cost

Active Publication Date: 2014-07-02
JIANGSU JIXIN WIND ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: wind power castings have complex structure, large size, high requirements for heat treatment equipment, easy deformation during heat treatment, high energy consumption, long production cycle and high cost
[0006] Chinese invention patent CN200510022689.9, the title of the invention is "Method for casting large-scale high-toughness parts with Ni-free low-temperature ductile iron in as-cast state". This method found that there were fragmented graphite in thick and large sections of 3MW products, which could not meet the mechanical requirements.
[0007] Chinese invention patent CN201010250274.8, the name of the invention is "Preparation method of low-temperature ductile iron castings for 3MW wind power hubs, casting additives, nodularizers", the method is GJS-400-18U-LT that can achieve low-temperature impact toughness at -40 °C The material requires a specific nodulizer. The composition and content of rare earth in the nodulizer are very strict and the cost is high, so it is not suitable for the development of megawatt-level wind power high-strength, high-toughness and low-temperature (-30°C) ductile iron castings production

Method used

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  • Preparation method of megawatt wind power high-strength high-toughness low-temperature (-30 DEG C) spheroidal graphite iron casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Ductile iron castings made for Xinjiang Goldwind Science and Technology Co., Ltd.—1.5MW fixed shaft, bushing, hub, and base

[0025] Using pig iron as the material, the element composition of the ductile iron material: C:3.7-3.9wt%, Si:1.9-2.2wt%, Mn≤0.2wt%, P%≤0.035wt%, S%≤0.02wt%, Sb: 0.0015-0.002wt%; the residual content of Mg is 0.03-0.045wt%, and the rest is iron and impurities produced during the preparation process.

[0026] The ductile iron material of the above formula is smelted first, and the temperature of the molten iron is controlled to be 1420-1460°C. After spheroidizing treatment, the formula of nodulizing agent is Mg5-7wt%, Si40-50wt%, and the rest is iron. The amount of nodulizing agent added is 1.0~1.2wt%, and the spheroidizing treatment temperature is 1420~1460°C.

[0027] Add silicon calcium barium inoculant after the spheroidization reaction starts, the composition formula is: Si70-80wt%, Ca1.5-2.5wt%, Ba8-12%, the rest is iron, the add...

Embodiment 2

[0030] Example 2: Ductile iron castings—2.5MW hub and base made for Xinjiang Goldwind Science and Technology Co., Ltd.

[0031] Elemental composition of ductile iron materials: C:3.7-3.9wt%, Si:1.9-2.1wt%, Mn≤0.2wt%, P%≤0.035wt%, S%≤0.02wt%, Sb:0.001-0.002wt% The amount of nodulizing agent added is 1.0-1.3%; the inoculant is added after the nodularization reaction starts, and the amount of inoculant added is 0.5-1.0wt%; others are the same as in Example 1.

[0032]The 2.5MW hub and base products prepared by the method in this example have stable performance meeting the strength requirements of GJS-400-18U-LT in EN1563 and the impact toughness requirements at -30°C low temperature, and the performance of the main body sample is greater than that required by the auxiliary test block. 80%, which is suitable for the performance requirements of high-strength and high-toughness castings for wind power in low-temperature wind farms at -30°C. Casting auxiliary test block performance:...

Embodiment 3

[0033] Embodiment 3: the comparison of preparation method of the present invention and prior art

[0034] Table 1: Comparison of preparation method of the present invention and prior art

[0035]

[0036] In Table 1, the method provided by Chinese patent CN201010250274.8 greatly increases the production cost because the nodulizer used is an expensive rare earth (due to strict requirements on composition and content, the price is expensive); and the nodulizer used in the preparation method of the present invention The chemical agent does not contain rare earth, and the added trace element Sb has basically no influence on the cost. The preparation method of the present invention can stably meet the strength requirements of GJS-400-18U-LT in EN1563 and -30℃ low temperature impact toughness requirements. The preparation method of the present invention has lower cost, and the casting cost is reduced: 80-100 yuan / ton.

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Abstract

The invention belongs to the technical field of cast iron, and particularly relates to a preparation method of a megawatt wind power high-strength high-toughness low-temperature (-30 DEG C) spheroidal graphite iron casting. According to the method, under the conditions of no thermal processing, no alloy element nickel and no specific rare earth spheroidizing agents and adoption of domestic pig iron, by reasonable component control and addition of the microelement Sb, a test lug is obtained with relatively low spheroidizing and inoculating processing cost and not only meets impact toughness at -30 DEG C but also meets the GJS-400-18U-LT tensile property. A megawatt wind power casting can be obtained and the nesting performance of the body of the casting can reach 80% of that of the test lug. The preparation method fills the gap of absence of materials meeting the GJS-400-18U-LT and the toughness at -30 DEG C in China.

Description

technical field [0001] The invention belongs to the technical field of cast iron, and in particular relates to a method for preparing a megawatt wind power high-strength, high-toughness and low-temperature (-30°C) nodular cast iron. Background technique [0002] Since 2006, megawatt wind turbines have become the mainstream model in the domestic wind power market, and wind power castings are mostly thick and large parts, which have increased from a few tons to tens of tons or even dozens of tons, making manufacturing more difficult. Wind turbines are generally installed in windy areas such as seasides or deserts. Most of these places belong to alpine regions, and the wind turbines are required to run smoothly for 20 years. Therefore, there are high requirements for the low-temperature performance and internal structure of castings. Ordinary ductile iron has low low-temperature impact toughness and is prone to brittle fracture in cold environments, so it is not suitable for wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/10B22C9/02
Inventor 华永荦闫兴义万曙雄陈玉芳陈柏林
Owner JIANGSU JIXIN WIND ENERGY TECH
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