CN101914721A - Method for preparing megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting - Google Patents
Method for preparing megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting Download PDFInfo
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Abstract
The invention relates to a method for preparing a megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting. The method comprises the following steps of: smelting cast iron serving as a raw material, wherein the smelting temperature is between 1,400 and 1,450 DEG C; spheroidizing, inoculating and recarburizing the raw material, wherein the spheroidizing temperature and the inoculating temperature are between 1,350 and 1,400 DEG C; and casting the obtained product to obtain the low-temperature Ni-free spheroidal iron casting. The formula of the spheroidal iron casting comprises the following components: 3.6 to 3.9 wt percent of C, 1.7 to 2.3 wt percent of Si, 0.1 to 0.3 wt percent of Mn, 0.01 to 0.06 wt percent of Sn, and 0.03 to 0.07 wt percent of residual Mg content. The components of high-strength high-toughness and low-temperature spheroidal iron are obtained by adding a spheroidizing agent and an inoculating agent and using a post inoculation method, wherein the spheroidizing agent comprises the following components: 5 to 8 wt percent of Mg, 1 to 2 wt percent of Re, 40 to 50 wt percent of Si, and balance of Fe. The method can make domestically-manufactured cast iron reach high strength and high toughness as cast condition by optimizing spheroidizing and inoculating methods and recarburization treatment under the condition of adding Sn.
Description
Technical field
The present invention relates to a kind of preparation method of low-temperature spheroidal iron, especially relate to the preparation method of the high-strength high-toughness and low-temperature magnesium iron that a kind of megawatt-level wind parts use.
Technical background
Wind energy is widely used and maturation, especially MW class wind turbine in Europe as renewable new source and green energy resource, has become the main product of wind-powered electricity generation industry.Domesticly greatly developed wind-powered electricity generation since 04 year, country is just vigorously supporting the wind-powered electricity generation project.
The MW class wind turbine working conditions is abominable, and the casting of employing low temperature spheroidal graphite cast iron such as its major parts such as wheel hub, base forms.Nodular iron casting requires low-temperature impact toughness, under the worse situation of working conditions (as offshore wind farm), more require high strength and-40 ℃ of low-temperature impact toughness, the external general EN-1563 standard that adopts, material is GJS-350-22U-LT, and domestic also have a corresponding standard.
Magnesium iron casting megawatt-level wind high-strength and high ductility parts, when attached casting was of a size of 70 * 70 * 170mm, if material is EN-GJS-400-18U-LT, then tensile strength required 370Mpa, impact value-20 ℃ single 〉=7J, three average 〉=10J; If material is EN-GJS-350-22U-LT, then tensile strength requires 320Mpa, impact value-40 ℃ single 〉=7J, and three average 〉=10J, intensity and impact property extremely difficulty are taken into account.
Require and intensity (20 ℃) requirement for reaching low temperature (40 ℃) impelling strength, external general employing adds Ni0.5～2wt% and produces low-temperature spheroidal iron.Add Ni0.5～2wt% as Denmark and India when producing the high-power wind-driven generator foundry goods, nickel is narrow resources, costs an arm and a leg.
Especially iron quality is good for external starting material, generally adopts the Australian pig iron and the Canadian pig iron, and its trace element and harmful element are than low many of the homemade pig iron.
Summary of the invention
The objective of the invention is: the preparation method who proposes a kind of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting.Especially using the homemade pig iron, under the condition of Ni as the alloy adding,, making the graphite pebbles refinement, increasing considerably number of graphite ball, and improved the nodularization rate by composition adjustment and optimization spheroidization and inoculation treatment process with Sn.Under as cast condition, reach high strength and high tenacity simultaneously, i.e. tensile strength 370Mpa ,-40 ℃ of impact values are single 〉=7J, the performance requriements of three average 〉=10J.
Technical scheme of the present invention is: with the homemade pig iron is raw material, and through melting, nodularization, breed and carburetting is handled, making low temperature through casting does not again have Ni magnesium iron spare,
The component prescription of described high-strength high-toughness and low-temperature spheroidal iron casting is: C 3.6～3.9wt%, Si 1.7～2.3wt%, Mn0.1～0.3wt%, Sn 0.01～0.06wt%, do not add Ni, residual content 0.03～0.07wt% of Mg, remaining is the impurity that produces in iron and the preparation process.
The composition of described high-strength high-toughness and low-temperature magnesium iron is to obtain by adding nodulizing agent, nucleating agent and employing late inoculation method, and wherein, the component prescription of nodulizing agent is: Mg 5～8wt%, and Re 1～2wt%, Si 40～50wt%, all the other are iron; The nucleating agent component prescription is: Si 70～80wt%, and all the other are iron, the add-on of nodulizing agent and nucleating agent is respectively 1.0～1.8wt% and 0.4～1.0wt%.Late inoculation adopts the method for current-following inoculation.
Casting technique after the nodularization is: at 1300 ℃～1380 ℃ the liquid form mixt after the nodularization is cast in the casting mold, and make it in casting mold, slowly be cooled to below 400 ℃, clean out foundry goods from casting mold, described slow refrigerative speed is 10～20 ℃/min preferably.
The pig iron of the present invention can adopt the homemade pig iron, but P is lower than 0.03wt% in the pig iron composition, and S is lower than 0.02wt%.
Improvement of the present invention is: adopt pre-treatment to handle the method that combines with carburetting.
The present invention adopts pre-treatment and carburetting to handle process combined, has effectively improved the activity of iron liquid, has increased the ability of graphite forming core, makes the graphite sphere diameter obtain refinement, and number of graphite ball increases substantially (150～250/mm
2), thereby obviously improved the over-all properties of foundry goods.
The invention has the beneficial effects as follows: the present invention program can use the homemade pig iron than external iron quality difference, even with this understanding, cast properties also can reach high strength (20 ℃) and-40 ℃ of impelling strength requirements.
The present invention replaces Ni to add as alloy with more economical Sn, and under the condition that trace adds, Sn is adsorbed on graphite and metal phase boundary, hinders carbon atom and passes crystal boundary to the graphite crystal nucleus diffusion mobility, the graphite sphere diameter is diminished, thereby reach the performance of high-strength and high ductility.
As cast condition of the present invention promptly reaches the material requirement, by composition adjustment and optimization spheroidization and inoculation treatment process, can produce the high-strength high-toughness and low-temperature magnesium iron.
Embodiment
The preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting.Be raw material (the homemade pig iron, as adopt the external pig iron more excellent) with the pig iron, through melting, nodularization, breed and carburetting is handled, making low temperature through casting does not again have Ni magnesium iron spare.P is lower than 0.03wt% in the wherein homemade pig iron composition, and S is lower than 0.02wt%.1400 ℃～1450 ℃ of nodularization temperature, 1350 ℃～1400 ℃ of inoculation temperature.
The component prescription of described high-strength high-toughness and low-temperature spheroidal iron casting is: C 3.6～3.9wt%, Si 1.7～2.3wt%, Mn0.1～0.3wt%, do not add Ni, add Sn 0.01～0.06wt%, residual content 0.03～0.07wt% of Mg, remaining is the impurity that produces in iron and the preparation process.Adopt the method for adding carburelant when carburetting is handled, add carburelant and will consider its melting rate and specific absorption.Preferably stir, the carburetting treatment temp also is controlled at 1400 ℃～1450 ℃, apply carburelant amount make composition C to the 3.6～3.9wt% of magnesium iron spare.Carburelant can be commercially available various carburelants, and carbon content is greater than 90% and doctor negative carburelant.
The composition of described high-strength high-toughness and low-temperature spheroidal iron casting is to obtain by adding nodulizing agent, nucleating agent and employing late inoculation method, and wherein, the component prescription of nodulizing agent is: Mg 5～8wt%, and Re 1～2wt%, Si 40～50wt%, all the other are iron; The nucleating agent component prescription is: Si 70～80wt%, and all the other are iron; The add-on of nodulizing agent and nucleating agent is respectively 1.0～1.8wt% and 0.4～1.0wt%.
Typical embodiment: select the domestic raw material pig iron, only require that P is lower than 0.03wt%%, S is lower than 0.02wt% and gets final product, C 3.7wt% wherein, Si 0.5wt%, Mn 0.2wt%, smelting temperature is at 1420 ℃, under this temperature through carburetting, nodularization and inoculation, add Sn 0.02wt%, the component prescription of nodulizing agent is: Mg 6wt%, Re 1wt%, Si 40wt%, all the other are iron; The nucleating agent composition: Si 70wt%, all the other are iron, the add-on of nodulizing agent and nucleating agent is respectively 1.0wt% and 0.5wt%.Adopt the late inoculation mode.And add carburelant 0.1wt%, and the composition of the iron casting that obtains: C 3.75%, Si 2.1%, and Mn 0.2%, and the residual content 0.04% of Mg obtains satisfactory foundry goods.Also reach-40 ℃ of impelling strength when adding Sn 0.05wt% and require (standards) referring to 200510022689.9.
According to the foregoing description, the pig iron of heterogeneity can adopt the interpolation of nodulizing agent, nucleating agent and the carburelant of different content.As long as satisfy the composition of final finished product, and component content is easily control, but the volatilization meeting of magnesium is some more.
Casting technique after the nodularization is: at 1300 ℃～1380 ℃ the liquid form mixt after the nodularization is cast in the casting mold, and make it slowly be cooled to clean out foundry goods below 400 ℃ from casting mold in casting mold, slow refrigerative speed is 10～20 ℃/min preferably.
Claims (6)
1. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting: it is characterized in that with the pig iron being raw material, at 1400 ℃～1450 ℃, nodularization, breed and carburetting is handled that nodularization, inoculation treatment temp are at 1350 ℃～1400 ℃ through melting, smelting temperature; Make low temperature through casting again and do not have Ni magnesium iron spare, the component prescription of described high-strength high-toughness and low-temperature spheroidal iron casting is: C 3.6～3.9wt%, Si 1.7～2.3wt%, Mn 0.1～0.3wt%, Sn 0.01～0.06wt%, residual content 0.03～0.07wt% of Mg, remaining is impurity in iron and the preparation process; The composition of described high-strength high-toughness and low-temperature magnesium iron is to obtain by adding nodulizing agent, nucleating agent and employing late inoculation method, and wherein, the component prescription of nodulizing agent is: Mg 5～8wt%, and Re 1～2wt%, Si 40～50wt%, all the other are iron; The nucleating agent component prescription is: Si 70～80wt%, and all the other are iron, the add-on of nodulizing agent and nucleating agent is respectively 1.0～1.8wt% and 0.4～1.0wt%; When handling, carburetting adds carburelant.
2. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting according to claim 1: it is characterized in that adopting carburelant, the amount that applies carburelant makes composition C to the 3.6～3.9wt% of magnesium iron spare.
3. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting according to claim 1: it is characterized in that the casting technique after the nodularization is: the liquid form mixt after the nodularization is cast in the casting mold at 1300 ℃～1380 ℃, and make it in casting mold, slowly be cooled to below 400 ℃, clean out foundry goods from casting mold, described slow refrigerative speed is 10～20 ℃/min.
4. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting according to claim 1: it is characterized in that P is lower than 0.03wt% in the pig iron composition, S is lower than 0.02wt%.
5. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting according to claim 1: it is characterized in that late inoculation adopts the method for current-following inoculation.
6. the preparation method of megawatt wind power high-strength high-toughness and low-temperature spheroidal iron casting according to claim 1: it is characterized in that Sn 0.01～0.06wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268589A (en) * | 2011-06-27 | 2011-12-07 | 宁波日星铸业有限公司 | Wheel hub of wind turbine generator system (WTGS) |
| CN104480374A (en) * | 2014-12-10 | 2015-04-01 | 新疆金风科技股份有限公司 | Low-temperature nodular iron casting and preparation method thereof |
| CN105568124A (en) * | 2014-10-09 | 2016-05-11 | 陕西重型汽车有限公司 | QT500-7 nodular cast iron material added with tin, and processing method thereof, and cast |
| 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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| GB1069058A (en) * | 1965-05-04 | 1967-05-17 | Int Nickel Ltd | Cast iron |
| JPH0238542A (en) * | 1988-07-27 | 1990-02-07 | Kubota Ltd | Spheroidal graphite cast iron for austempering |
| KR20070085757A (en) * | 2007-06-04 | 2007-08-27 | 티센크루프 스틸 악티엔게젤샤프트 | High-strength steel strip or sheet exhibiting twip properties and method for producing said strip by direct strip casting |
| CN101168191A (en) * | 2007-05-30 | 2008-04-30 | 江阴市吉鑫机械有限公司 | Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron |
| CN101748325A (en) * | 2009-12-30 | 2010-06-23 | 山东省汇丰机械集团总公司章丘市铸造厂 | High-strength wear-resisting ductile iron coiling block and manufacturing method thereof |
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2010
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| GB1069058A (en) * | 1965-05-04 | 1967-05-17 | Int Nickel Ltd | Cast iron |
| JPH0238542A (en) * | 1988-07-27 | 1990-02-07 | Kubota Ltd | Spheroidal graphite cast iron for austempering |
| CN101168191A (en) * | 2007-05-30 | 2008-04-30 | 江阴市吉鑫机械有限公司 | Method for casting megawatt-stage wind electric generator set from minus 20 degree low-temperature cast Ni-free ball iron |
| KR20070085757A (en) * | 2007-06-04 | 2007-08-27 | 티센크루프 스틸 악티엔게젤샤프트 | High-strength steel strip or sheet exhibiting twip properties and method for producing said strip by direct strip casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268589A (en) * | 2011-06-27 | 2011-12-07 | 宁波日星铸业有限公司 | Wheel hub of wind turbine generator system (WTGS) |
| CN102268589B (en) * | 2011-06-27 | 2012-11-14 | 宁波日星铸业有限公司 | Wheel hub of wind turbine generator system (WTGS) |
| CN105568124A (en) * | 2014-10-09 | 2016-05-11 | 陕西重型汽车有限公司 | QT500-7 nodular cast iron material added with tin, and processing method thereof, and cast |
| CN104480374A (en) * | 2014-12-10 | 2015-04-01 | 新疆金风科技股份有限公司 | Low-temperature nodular iron casting and preparation 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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| CN101914721B (en) | 2012-04-25 |
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