CN101168191A - Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron - Google Patents
Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron Download PDFInfo
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- CN101168191A CN101168191A CNA2007100227424A CN200710022742A CN101168191A CN 101168191 A CN101168191 A CN 101168191A CN A2007100227424 A CNA2007100227424 A CN A2007100227424A CN 200710022742 A CN200710022742 A CN 200710022742A CN 101168191 A CN101168191 A CN 101168191A
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Abstract
The invention relates to a method which uses -20DEG C low-temperature as-cast ball iron without Ni to cast megawatt grade wind and electricity set element. The method prepares low-temperature as-cast ball iron without Ni by smelting, balling and inoculating with the raw material of domestic iron, then casts to thin walled castings of beams, boxes and the like. The component dispensation of the low-temperature as-cast ball iron without Ni is that C is accounted from 3.6 percent to 3.9 percent, Si is accounted from 1.7 percent to 3 percent, Mn is accounted from 1.7 percent to 3 percent, Ni is not included, the survival content of Mg is from 0.045 percent to 0.07 percent, the rest is iron and impurity, wherein P is less than 0.04 percent, and S is less than 0.02 percent in the impurity, the content of low-temperature as-cast ball iron is required by adding balling agent and inoculating agent and employing secondary inoculating method. After balling, the casting technique is that the liquid mixture produced by balling is cast into a mould at the temperature between 1300 and 1380 DEG C to be cooled below 300 DEG C gradually in the mould, then cleared out from the mould. The invention is capable of using domestic foundry iron of which quality is poorer than that of foreign countries and achieving the requirement of the dynamic ductility at the temperature of -20DEG C without adding Ni, simultaneously satisfying the requirement of other mechanical performances.
Description
Technical field
The present invention relates to a kind of low-temperature spheroidal iron casting technique, especially relate to a kind of-20 ℃ of low-temperature cast Ni-free magnesium irons casting megawatt-level wind unit parts---the method for beam, casing class thin-wall part.Belong to the metal casting technical field.
Background technology
Low-temperature spheroidal iron casting toughness piece, be typically high-power MW class wind turbine (its power reaches 1MW to 5MW) parts, condition of work is abominable, its critical piece beam, casing class thin-wall part adopt the casting of low temperature spheroidal graphite cast-iron to form, nodular iron casting requires low-temperature impact toughness, the external general EN-1563 standard that adopts, material is the GJS400-18U-LT that requires-20 ℃ of impact flexibility, domestic employing GB1348-88 standard material is the QT400-18AL of-20 ℃ of impact flexibility.
-20 ℃ of low-temperature cast Ni-free magnesium iron casting megawatt-level wind unit parts---beam, casing class thin-wall part, its wall thickness＜40mm, heavy 100Kg---the 1T of single-piece, impact value-20 ℃ single 〉=9J, three average 〉=12J extremely are difficult for reaching.
For reaching low-temperature impact toughness requirement and requirement of strength, external general the employing adds Ni 0.2～2% production low-temperature spheroidal iron.When producing the high-power wind-driven generator foundry goods, add Ni 0.3～2% as Denmark and India.
For reaching low-temperature impact toughness and percentage elongation requirement, domestic employing annealing way, and for complex structure spare, the heat treatment flexible type.And needing huge equipment investment during the very huge parts of the above-mentioned weight and volume of annealing in process, the technology cost of processing rises.
Particularly iron quality is good for external raw material, generally adopts the Canadian pig iron and the Australian pig iron, and its trace element and harmful element are more much lower than the domestic pig iron.Nickel is goods and materials in short supply, costs an arm and a leg.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of domestic pig iron that can use than external iron quality difference is provided, be issued to-20 ℃ of impact flexibility requirements in the condition that does not add Ni, satisfy-20 ℃ of low-temperature cast Ni-free magnesium iron casting megawatt-level wind unit parts---the method for beam, casing class thin-wall part that other mechanical performance requires simultaneously.
The object of the present invention is achieved like this: a kind of-20 ℃ of low-temperature cast Ni-free magnesium irons casting megawatt-level wind unit parts---the method for beam, casing class thin-wall part, it is characterized in that: it is to be raw material with the homemade pig iron, make the low-temperature cast Ni-free magnesium iron through melting, nodularization, inoculation, again through cast beam, casing class thin-wall part, S is lower than 0.02% in the wherein homemade pig iron raw material composition, smelting temperature is at 1400 ℃～1450 ℃, and nodularization, inoculation temperature are at 1400 ℃～1450 ℃;
The composition prescription of described low-temperature cast Ni-free magnesium iron is: C 3.6%～3.9%, and Si 1.7%～3%, and Mn 0.1%～0.4%, do not add Ni, the residual content 0.045%～0.07% of Mg, remaining is the impurity that produces in iron and the preparation process, P in the impurity＜0.04%, S＜0.02%;
The composition of above-mentioned content low-temperature cast Ni-free magnesium iron is to obtain by adding nodulizer, inovulant and employing late inoculation method, and wherein, the composition prescription of nodulizer is: Re 1～2%, Mg 7～9%, Si 40～46%, and all the other are iron; The composition prescription of inovulant is: Si 70%-80%, and all the other are iron, the dosage of nodulizer and inovulant is respectively 1.0%～1.8% and 0.5%～1.3%,
Casting technique is after the nodularization: at 1300 ℃～1380 ℃ the liquefied mixture after the nodularization is cast in the casting mold, and makes it slowly be cooled to go out clearly from casting mold below 300 ℃ in casting mold.
The present invention does not adopt heat treatment, reaches the as cast condition material requirements by regulation and control composition and spheriodization process thereof; Add nodulizer, inovulant and employing late inoculation method, can improve the nodularization state, number of graphite ball is increased, graphite nodule is rounding more, and as cast condition body nodularization rate is reached more than 90%, and ferrite reaches more than 90%; The present invention can use the domestic pig iron than external iron quality difference, do not add Ni, even with this understanding, product quality also can stablize reach GJS-400-180-LT that the EN1563 international standard requires for the thin-walled smallclothes in-20 ℃ of low-temperature impact toughness and other mechanical performances.
The specific embodiment
The present invention relates to-20 ℃ of low-temperature cast Ni-free magnesium iron casting megawatt-level wind unit parts---the method for beam, casing class thin-wall part.This type of casting section thickness＜40mm, foundry goods tonnage between 100Kg-1T, require-20 ℃ of following impact values single 〉=9J, three average 〉=12J.Its casting method is: with the homemade pig iron is raw material, through melting, nodularization, breed and make the low-temperature cast Ni-free magnesium iron, again through cast beam, casing class thin-wall part, S is lower than 0.02% in the wherein homemade pig iron raw material composition, smelting temperature is at 1400 ℃～1450 ℃, and nodularization, inoculation temperature are at 1400 ℃～1450 ℃.The composition prescription of described low-temperature cast Ni-free magnesium iron is: C 3.6%～3.9%, and Si 1.7%～3%, and Mn 0.1%～0.4%, do not add Ni, the residual content 0.045%～0.07% of Mg, remaining is the impurity that produces in iron and the preparation process, P in the impurity＜0.04%, S＜0.02%.The composition of above-mentioned content low-temperature cast Ni-free magnesium iron is to obtain by adding nodulizer, inovulant and employing late inoculation method, and wherein, the composition prescription of nodulizer is: Re 1～2%, Mg 7～9%, Si 40～46%, and all the other are iron; The composition prescription of inovulant is: Si 70%-80%, and all the other are iron, the dosage of nodulizer and inovulant is respectively 1.0%～1.8% and 0.5%～1.3%.Casting technique is after the nodularization: at 1300 ℃～1380 ℃ the liquefied mixture after the nodularization is cast in the casting mold, and makes it slowly be cooled to go out foundry goods clearly below 300 ℃ from casting mold in casting mold.Preferably 10 to 20 ℃/minute of the speed of described slow cooling.
Claims (2)
1.-20 ℃ of low-temperature cast Ni-free magnesium irons are cast megawatt-level wind unit parts method, it is characterized in that: it is to be raw material with the homemade pig iron, through melting, nodularization, breed and make the low-temperature cast Ni-free magnesium iron, again through cast beam, casing class thin-wall part, S is lower than 0.02% in the wherein homemade pig iron raw material composition, smelting temperature is at 1400 ℃～1450 ℃, and nodularization, inoculation temperature are at 1400 ℃～1450 ℃;
The composition prescription of described low-temperature cast Ni-free magnesium iron is: C 3.6%～3.9%, Si1.7%～3%, and Mn 0.1%～0.4%, do not add Ni, the residual content 0.045%～0.07% of Mg, remaining is the impurity that produces in iron and the preparation process, P in the impurity＜0.04%, S＜0.02%;
The composition of above-mentioned content low-temperature cast Ni-free magnesium iron is to obtain by adding nodulizer, employing inovulant and late inoculation method, and wherein, the composition prescription of nodulizer is: Re 1～2%, Mg7～9%, Si40～46%, and all the other are iron; The composition prescription of inovulant is: Si70%-80%, and all the other are iron, the dosage of nodulizer and inovulant is respectively 1.0%～1.8% and 0.5%～1.3%;
Casting technique is after the nodularization: at 1300 ℃～1380 ℃ the liquefied mixture after the nodularization is cast in the casting mold, and makes it slowly be cooled to go out foundry goods clearly below 300 ℃ from casting mold in casting mold.
2. a kind of-20 ℃ of low-temperature cast Ni-free magnesium irons casting megawatt-level wind unit parts method according to claim 1, it is characterized in that: the speed of slowly cooling off in the described casting mold is 10～20 ℃/minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100227424A CN101168191A (en) | 2007-05-30 | 2007-05-30 | Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100227424A CN101168191A (en) | 2007-05-30 | 2007-05-30 | Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914721A (en) * | 2010-08-09 | 2010-12-15 | 江苏吉鑫风能科技股份有限公司 | Method for preparing megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting |
| CN102373364A (en) * | 2010-11-20 | 2012-03-14 | 甘肃酒钢集团西部重工股份有限公司 | Wind-power equipment casting and manufacturing method thereof |
| CN115198167A (en) * | 2022-09-15 | 2022-10-18 | 江苏锡华铸造有限公司 | Preparation method of high-strength high-yield-strength high-elongation ductile iron for large-megawatt wind power |
-
2007
- 2007-05-30 CN CNA2007100227424A patent/CN101168191A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914721A (en) * | 2010-08-09 | 2010-12-15 | 江苏吉鑫风能科技股份有限公司 | Method for preparing megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting |
| CN101914721B (en) * | 2010-08-09 | 2012-04-25 | 江苏吉鑫风能科技股份有限公司 | Method for preparing megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting |
| CN102373364A (en) * | 2010-11-20 | 2012-03-14 | 甘肃酒钢集团西部重工股份有限公司 | Wind-power equipment casting and manufacturing method thereof |
| CN102373364B (en) * | 2010-11-20 | 2013-04-24 | 甘肃酒钢集团西部重工股份有限公司 | Wind-power equipment casting and manufacturing method thereof |
| CN115198167A (en) * | 2022-09-15 | 2022-10-18 | 江苏锡华铸造有限公司 | Preparation method of high-strength high-yield-strength high-elongation ductile iron for large-megawatt wind power |
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Open date: 20080430 |