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Preparation method of low temperature spherical iron casting for 3 MW wind power wheel hub as well as additive, nodulizing agent, inoculant and instantaneous inoculant for founding

A technology of instantaneous inoculation and spheroidizing agent, which is applied in the field of metal casting, can solve the problems of low spheroidization rate, long production cycle, easy deformation, etc., and achieve the goal of improving the decay ability, increasing the number of graphite spheres and roundness, and improving the structure Effect

Active Publication Date: 2010-12-08
JIANGSU JIXIN WIND ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel is currently expensive and resources are scarce
[0006] 4. In order to improve the impact toughness and internal organizational structure of the low-temperature ductile iron casting body test block; heat treatment is generally used in China, but for 3MW wind power hub castings, the structure is complex and the size is large, and it is easy to deform during heat treatment, consumes a lot of energy, and shortens the production cycle. long and expensive
However, the 3MW wind turbine hub casting has a complex structure and complex modeling process, so it is not conducive to adopting the method of forced cooling, and the method of forced cooling has a greater safety risk
Due to the large structure of the casting, the cost of chilling with chilled iron is also high
[0009] 7. Chinese patent ZL200510022689.9 method for casting large-scale high-toughness parts with Ni-free low-temperature ductile iron in the as-cast state. When it is used for 3MW wind power hubs, it is found that there are fragmented graphite in the center of the thick and large cross-section (200mm-300mm) area of ​​the casting. , the spheroidization rate is lower than the 3rd grade stipulated in GB / T9441, and the performance of the main body sample test block in the thick and large cross-section area of ​​the casting cannot reach 80% of the performance of the attached casting test block

Method used

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  • Preparation method of low temperature spherical iron casting for 3 MW wind power wheel hub as well as additive, nodulizing agent, inoculant and instantaneous inoculant for founding
  • Preparation method of low temperature spherical iron casting for 3 MW wind power wheel hub as well as additive, nodulizing agent, inoculant and instantaneous inoculant for founding
  • Preparation method of low temperature spherical iron casting for 3 MW wind power wheel hub as well as additive, nodulizing agent, inoculant and instantaneous inoculant for founding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Dalian Huarui 3MW hub casting (GJS-400-18U-LT material) produced by our company

[0028] The formula of nickel-free low temperature ductile iron is as follows:

[0029] C: 3.75-3.9%; Si: 2.0-2.5%; Mn 0.2-0.3%; P: <0.045%; S: <0.02%; Mg: 0.03-0.06%; Trace impurity elements carried in by raw materials, these trace impurity elements are all below 0.01%, and the total amount of impurities does not exceed 0.1%.

[0030] The preparation steps are:

[0031]1) Smelting: use medium frequency induction furnace for smelting, the materials are weighed according to a certain proportion of pig iron (75% ~ 80%), recycled material (10% ~ 15%), and scrap steel (5% ~ 10%), and then added to the electric furnace for smelting , The smelting temperature is 1480°C-1550°C. After the temperature of the molten iron reaches 1420°C-1460°C, it is spheroidized by the punching method. Domestic pig iron is used as raw material, and alloy elements such as nickel (Ni) are not added.

[0...

Embodiment 2

[0036] Example 2: A company's 3MW hub casting (GJS-350-22U-LT material) produced by our company

[0037] The formula of nickel-free low temperature ductile iron is as follows:

[0038] C: 3.6-3.8%; Si: 1.7-2.1%; Mn 0.15-0.22%; P: <0.045%; S: <0.02%; Mg: 0.03-0.06%; Trace impurity elements carried in by raw materials, these trace impurity elements are all below 0.01%, and the total amount of impurities does not exceed 0.1%.

[0039] The preparation steps are:

[0040] 1) smelting: smelting raw materials and the process thereof are the same as in Example 1.

[0041] 2), Spheroidization and inoculation: Nodulizer components are: A-type nodulizer: Mg: 6.3%, Si: 45%, Ba: 2.6%, Ca: 1.4%, and the rest is Fe; B-type nodulizer : Mg: 6.8%, Si: 44%, RE(Y): 1.4%, wherein the mass percentage of heavy rare earth element yttrium (Y) in RE(Y) is ≥50%, and the rest is Fe. The total amount of nodulizer added is 1.0%-1.05% of the mass of molten iron, and the addition method is: 65% type A no...

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Abstract

The invention relates to a preparation method of a low temperature spherical iron casting for a 3 MW wind power wheel hub as well as an additive, a nodulizing agent, an inoculant and an instantaneous inoculant for founding. The low temperature spherical iron comprises the following elements in percentages by weight: 3.6-3.9 percent of C, 1.7-2.5 percent of Si, 0.1-0.3 percent of Mn, less than 0.045 percent of P, less than 0.02 percent of S, 0.03-0.6 percent of Mg and the balance of trace impurity element. The preparation method of the low temperature spherical iron comprises the following steps of: (1) smelting; (2) nodulizing and inoculation, wherein the nodulizing agent consists of an A-type nodulizing agent and a B-type nodulizing agent, the A-type nodulizing agent comprises the following elements in percentages by weight: 5.5-6.5 percent of Mg, 44-48 percent of Si, 2-3 percent of Ba, 1-1.4 percent of Ca and the balance of Fe, and the B-type nodulizing agent comprises the following elements in percentages by weight: 6-7 percent of Mg, 42-45 percent of Si, 1.0-1.5 percent of Re and the balance of Fe, and stream inoculation is carried out in the nodulizing process and the inoculant comprises the following elements in percentages by weight: 72-76 percent of Si, 1.5-2.5 percent of Ca, 8-12 percent of Ba, less than 0.15 percent of Al and the balance of Fe; and (3) pouring: stream instantaneous inoculation is carried out in the pouring process and the instantaneous inoculant comprises the following elements in percentages by weight: 68-75 percent of Si, 0.75-1.25 percent of Ca, 1.5-2.5 percent of Bi, less than 0.15 percent of Al and the balance of Fe.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature ductile iron casting for a 3MW wind power wheel hub and casting additives, a nodulizer, an inoculant, and a transient inoculant, belonging to the field of metal casting. Background technique [0002] Wind energy, as a clean energy and green energy, has been widely used in Europe and the United States, and wind power generation technology has also matured. my country has vigorously developed wind power generation technology since 2004. The main development direction of wind power in the future is high-power (3MW and above units) and offshore wind power. It is expected to maintain an annual growth rate of 15% before 2015. At present, the manufacture of high-power wind turbines has the following problems: [0003] 1. Low-temperature ductile iron casts thick, large-section and high-toughness parts, typically nuclear spent fuel ductile iron containers, high-power wind turbines and some min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21C7/00
Inventor 华永荦陈柏林王建宏俞建平陈玉芳唐军
Owner JIANGSU JIXIN WIND ENERGY TECH
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