CN101407887A

CN101407887A - Cast for manufacturing wind energy apparatus

Info

Publication number: CN101407887A
Application number: CNA2008101944931A
Authority: CN
Inventors: 李建逸; 宋忠波; 庄志平; 朱年根; 施允辉; 姜茂斌
Original assignee: CHANGZHOU ZHUORUN WIND POWER EQUIPMENT Co Ltd
Current assignee: CHANGZHOU ZHUORUN WIND POWER EQUIPMENT Co Ltd
Priority date: 2008-10-24
Filing date: 2008-10-24
Publication date: 2009-04-15

Abstract

The invention discloses a casting used for manufacturing wind energy equipment, which is a ferrite ductile iron casting and suitable for the production of components of wind energy equipment with wall thickness not more than 200mm. The weight percentages of chemical elements contained in the casting to the casting are as follows: 3.65 to 3.75 percent of C, 1.90 to 2.10 percent of Si, 0.20 to 0.25 percent of Mn, equal to or less than 0.045 percent of P, 0.006 to 0.015 percent of S, 0.040 to 0.055 percent of Mg, 0.010 to 0.020 percent of Ce, 0.005 to 0.010 percent of Ld, equal to or less than 0.045 percent of Ti, equal to or less than 0.010 percent of Cu, equal to or less than 0.030 percent of Al, equal to or less than 0.010 percent of Cr, equal to or less than 0.002 percent of V, 0.002 to 0.005 percent of Sb and the residual quantity of Fe element. By effectively controlling the chemical compositions contained in the elements of the casting acquired through smelting, the invention causes the mechanical property of the casting to completely meet the requirements for manufacturing parts of wind energy equipment and meet the demand of the use of wind energy equipment in low temperature environments.

Description

A kind of foundry goods that is used to make wind energy plant

Technical field

The present invention relates to a kind of foundry goods that wall thickness is not more than the wind energy plant of 200mm that is used to make.

Background technology

Foundry goods is the primary member in the wind energy plant, comprises the member such as wheel hub, base, wheel casing, mechanical stand of blading, and the wall thickness of such foundry goods generally below 200mm, is ferrite ductile cast iron spare, the tensile strength sigma of requirement _b〉=370N/mm ², yield strength σ _0.2〉=240N/mm ²Unit elongation δ (%) 〉=12, J:3 mean value of-20 ℃ of impact absorbing energies 〉=10, single value 〉=7, foundry goods matrix ferrite 〉=90% is because the working conditions of wind energy plant is very abominable, therefore require foundry goods to have high tenacity under the low temperature situation, in order to satisfy the requirement of wind energy plant, will control the chemical ingredients of foundry goods, so that the mechanical property of foundry goods can satisfy the requirement of wind energy plant to used foundry goods comprehensively.

Summary of the invention

The technical problem to be solved in the present invention is: a kind of foundry goods that is used to make wind energy plant is provided, be applicable to and make the member that wall thickness is not more than the wind energy plant of 200mm, it is by the effective control to the element chemistry composition that foundry goods contained, and makes the mechanical property of foundry goods fully satisfy the requirement of wind energy plant.

The technical solution adopted for the present invention to solve the technical problems is: a kind of foundry goods that is used to make wind energy plant, for ferrite ductile cast iron spare, it passes through electrosmelting, desulfurization is handled, spheroidizing, inoculation and to pour into a mould a series of casting techniques resultant, contained chemical element accounts for the mass percent of foundry goods and is in the described foundry goods: C 3.65%～3.75%, Si 1.90%～2.10%, Mn 0.20%～0.25%, P≤0.045%, S0.006%～0.015%, Mg 0.040%～0.055%, and Ce 0.010%～0.020%, Ld 0.005%～0.010%, Ti≤0.045%, Cu≤0.010%, Al≤0.030%, Cr≤0.010%, V≤0.002%, Sb 0.002%～0.005%, and surplus is the Fe element.

Specifically, when average carbon equivalent ce=C%+1/3Si%=4.3% is reasonable component, because too high C makes spheroidal graphite cast iron produce the graphite drift phenomenon easily, thereby reduce the mechanical mechanics property of foundry goods, and C content is low excessively, can make the castability and the nodularization deleterious of foundry goods again, therefore takes all factors into consideration, should guarantee that spheroidal graphite cast iron has good mechanical performance and castability when selecting the content of C, it is comparatively reasonable that C content is chosen in 3.65%～3.75% scope; For the spheroidal graphite cast iron of low-temperature high-toughness, Si is a key element, content surpasses certain value can make the elongation of foundry goods and impact value reduce significantly, but content is lower than certain value can make foundry goods produce shrinkage cavity shrinkage porosity and spoken parts in traditional operas phenomenon, cause castability poor, take all factors into consideration, the scope that Si content is comparatively suitable should be between 1.9%～2.1%, getting intermediate value draws: CE=3.7%+1/3 * 2.0%=4.3% meets reasonable component requirement.

S content surpasses at 0.015% o'clock in the foundry goods, the nodularization effect instability of foundry goods in the time of can causing casting, and need to use a large amount of nodulizing agents, promptly reduce castability and increased production cost again; But S content is low excessively, as is lower than at 0.006% o'clock, can make the nodularization effect and the pregnant effect variation of foundry goods again, has reduced the mechanical property of foundry goods on the contrary.

Mg is the principal element that balling-up turns usefulness in foundry goods, but content also need control within the specific limits, surpasses 0.055% and is easy to generate casting flaw such as shrinkage cavity shrinkage porosity slag inclusion, increases the spoken parts in traditional operas degree, reduces cast properties; Being lower than 0.040% causes abnormal nodularizing again easily, lowers mechanical property.

Ce and Ld are the auxiliary elements when being used for spheroidizing, have effects such as degasification, deoxidation and promotion nodularization, if their content is low excessively, can cause abnormal nodularizing and decaying spheroidisation, reduce mechanical property; But the Ce of too high amount and Ld can produce negative segregation in the process of setting of foundry goods, make spheroidal graphite cast iron produce chunky graphite, reduce mechanical property, and therefore comparatively reasonably span of control is: Ce 0.010%～0.020%, and Ld 0.005%～0.010%.

Mn has been the element of alloying action, because casting composition of the present invention is no Ni prescription, for tensile strength and the yield strength that improves foundry goods, with the element of Mn as an alloying action, can reduce production costs greatly, but content is crossed low then alloying action effect and is not reached the too high foundry goods generation grain boundary segregation that makes easily, reduce the plasticity and the toughness of foundry goods, comparatively reasonably span of control is 0.20%～0.25%.

Sb is that the form with trace element is added when spheroidizing, mainly be to play neutralization reaction with Ce, eliminate the graphite of chunky shape, improve the roundness and the nodularization rate of graphite pebbles, but Sb is again the element of anti-nodularization under excessive situation, therefore should control it in reasonable range, generally speaking, for the nodular iron casting of wall thickness less than 60mm, the content of Sb is advisable 0.0020%～0.0025%, for the nodular iron casting of wall thickness at 60mm～200mm, the content of its Sb is comparatively suitable 0.0045%～0.0050%.

P, Ti, Cu, Al, these several elements of Cr and V belong to the detrimental impurity element, should strictness be controlled, the existence of detrimental impurity element, the meeting that has reduces the tensile strength and the yield strength of foundry goods, the meeting that has reduces the plasticity and the toughness of foundry goods, thereby reduced the use properties of foundry goods, but, in order to realize the production domesticization of product, can use the starting material of China, require the content of these elements to cross low even also be not irrational, because if adopt external high-purity starting material, the casting cost is greatly improved, obviously this is worthless, actual operation instruction, and it is more rational that the content of the shared foundry goods of these detrimental impurity elements is controlled in the following scope, also can not influence the mechanical property and the use properties of foundry goods: P≤0.045%, Ti≤0.045%, Cu≤0.010%, Al≤0.030%, Cr≤0.010%, V≤0.002%.

The invention has the beneficial effects as follows that the present invention makes the mechanical property of the foundry goods of melting gained reach the requirement of making the wind energy plant component fully by the component proportions of the contained element of strict control foundry goods, has satisfied the requirement that wind energy plant uses under severe environment.

Specific embodiment

The parts of the wind energy plant of embodiment 1:0.85MW power--inclined to one side beam, weight 63Kg, main wall thickness is 40mm, starting material are through electrosmelting, add sweetening agent in the molten iron and carry out the desulfurization processing, add nodulizing agent and carry out spheroidizing and use nucleating agent to carry out inoculation, carry out casting pouring at last, obtain being used to make the foundry goods of inclined to one side beam after cooling, after measured, the mass percent that contained chemical element accounts for foundry goods in the foundry goods is respectively: C 3.72%, and Si 2.05%, and Mn 0.21%, P 0.041%, S 0.012%, and Mg 0.045%, and Ce 0.015%, Ld 0.005%, Ti 0.042%, and Cu 0.009%, and Al 0.021%, Cr 0.005%, V 0.001%, and Sb 0.0024%, and surplus is the Fe element.The significant points of foundry goods is carried out magnetic-particle inspection and UT (Ultrasonic Testing) detection, and the foundry goods dense internal organization does not have any casting flaw, and the nodularization rate of body reaches 90%, and mechanical property is measured: tensile strength is 410N/mm ², yield strength is 255N/mm ², ballistic work three sub-values were respectively 16,16,15 when elongation was 21% ,-20 ℃, had satisfied service requirements fully.

Parts-the base of the wind energy plant of embodiment 2:2.4MW power, weight 21189Kg, main wall thickness is 80mm, starting material are through electrosmelting, add sweetening agent in the molten iron and carry out the desulfurization processing, add nodulizing agent and carry out spheroidizing and use nucleating agent to carry out inoculation, carry out casting pouring at last, obtain being used to make the foundry goods of inclined to one side beam after cooling, after measured, the mass percent that contained chemical element accounts for foundry goods in the foundry goods is respectively: C 3.68%, and Si 1.93%, and Mn 0.24%, P 0.040%, S 0.010%, and Mg 0.052%, and Ce 0.016%, Ld 0.007%, Ti 0.041%, and Cu 0.009%, and Al 0.022%, Cr 0.004%, V 0.001%, and Sb 0.0049%, and surplus is the Fe element.The significant points of foundry goods is carried out magnetic-particle inspection and UT (Ultrasonic Testing) detection, and the foundry goods dense internal organization does not have any casting flaw, and the nodularization rate of body reaches 90%, and mechanical property is measured: tensile strength is 388N/mm ², yield strength is 250N/mm ², ballistic work three sub-values were respectively 14,15,14 when elongation was 19% ,-20 ℃, had satisfied service requirements fully.

Claims

1. foundry goods that is used to make wind energy plant, for ferrite ductile cast iron spare, it is characterized in that: contained chemical element accounts for the mass percent of foundry goods and is in the described foundry goods: C 3.65%～3.75%, Si 1.90%～2.10%, Mn 0.20%～0.25%, P≤0.045%, and S 0.006%～0.015%, Mg 0.040%～0.055%, Ce 0.010%～0.020%, and Ld 0.005%～0.010%, Ti≤0.045%, Cu≤0.010%, Al≤0.030%, Cr≤0.010%, V≤0.002%, Sb 0.002%～0.005%, and surplus is the Fe element.

2. a kind of foundry goods that is used to make wind energy plant according to claim 1, it is characterized in that: the mass percent that described Sb element accounts for foundry goods is: when casting section thickness is 0.002%～0.0025% during less than 60mm, when casting section thickness is 0.0045%～0.005% when being 60mm～200mm.