CN102312034A - Method of producing wind power casting from blast furnace molten iron - Google Patents
Method of producing wind power casting from blast furnace molten iron Download PDFInfo
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- CN102312034A CN102312034A CN201110222113A CN201110222113A CN102312034A CN 102312034 A CN102312034 A CN 102312034A CN 201110222113 A CN201110222113 A CN 201110222113A CN 201110222113 A CN201110222113 A CN 201110222113A CN 102312034 A CN102312034 A CN 102312034A
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Abstract
The invention discloses a method of producing a wind power casting from blast furnace molten iron, which belongs to the technical field of casting. The method comprises the following steps: 1) adding melted iron obtained in the process of melting in a blast furnace into an arc furnace, heating the melted iron and adjusting components in the melted iron; 2) pouring the melted iron in a ladle when the temperature of and the components in the melted iron meet requirements, and carrying out desulphurization and spheroidization on the melted iron with a nodulizer; 3) adding an inoculant into the melted iron that has undergone desulphurization and spheroidization for inoculation; 4) carrying out micro-alloying on the melted iron; 5) after treatment in the previous steps, pouring the melted iron into a casting mold with casting temperature being controlled at 1300 to 1340 DEG C, and carrying out slow cooling so as to obtain the wind power casting with performance meeting requirements. The advantages of the invention are as follows: process flow is substantially shortened, production efficiency is improved, and cost is saved; the invention is of important significance to energy conservation and consumption reduction.
Description
Affiliated technical field
The present invention relates to a kind of wind-powered electricity generation castings production technology, specifically is the method for the blast-melted production wind-powered electricity generation of a kind of usefulness foundry goods, belongs to casting and ferrous metallurgy field.
Background technology
Wind-power electricity generation is a wind energy clean utilization efficient manner the most.High quality wind-powered electricity generation foundry goods is the reliability service of wind power generating set, effectively utilizes the key of wind energy.The wind power generator group is installed in the field more, and working condition is harsh, and the quality of wind-powered electricity generation foundry goods is proposed high requirement.
The ferrite ductile cast iron obdurability is good, is the first-selected material of Large-scale Wind Turbines foundry goods.But the common wall thickness of large-scale wind electricity foundry goods surpasses 100mm, and even weight reaches several tons of tens of tons.This type super large ductile iron spare graphite pebbles in process of setting distorts easily, needs strict control composition and technological measure could obtain qualified foundry goods.
Present existing castings production process all is after furnace charges such as the pig iron, steel scrap are added electric furnace or cupola melting, to obtain iron liquid, and then the cooling of casting after iron liquid handled.The pig iron then is to obtain through the blast-melted pig iron ingot mould postcooling that pours into.In this course, the fusing of furnace charges such as the pig iron needs to consume a large amount of energy.
The Chinese invention patent Shen Qing Publication of application number 200810141326.0 discloses a kind of blast furnace-intermediate frequency furnace duplexing smelting short process production technology, and blast furnace iron liquid is introduced medium-frequency induction furnace, and handle iron liquid the back of heating up, then the direct pouring foundry goods.This method has shortened technical process, has practiced thrift the energy greatly.But weak point is that induction furnace is relatively poor to iron liquid composition adjusting controllability, and blast furnace iron liquid can't satisfy the requirement of high-performance wind-power castings production after heating through induction furnace.
Summary of the invention
The present invention provides a kind of method of blast-melted production wind-powered electricity generation foundry goods, produces the wind-powered electricity generation foundry goods through blast furnace and electric arc furnace double melting.
Technical scheme of the present invention is following: a kind of method of blast-melted production wind-powered electricity generation foundry goods comprises:
1) original iron melt that obtains behind the blast furnace smelting adds and heats up in the electric arc furnace and the composition adjustment;
2) after iron liquid temp and composition reach requirement, original iron melt is poured in the casting ladle, carried out desulfurization and spheroidizing with nodulizing agent; Described nodulizing agent is a re-si-mg alloy; The add-on of nodulizing agent is the 0.8-1.0% of iron liquid quality;
3) the iron liquid after the desulfurization spheroidizing is added nucleating agent and carry out inoculation; Nucleating agent is a ferro-silicon; The add-on of nucleating agent is the 0.4-0.6% of iron liquid quality;
4) iron liquid is carried out microalloying: the original iron melt after nodularization and the inoculation is added trace metal Sb carry out microalloying; Trace metal Sb add-on is 0.1% of an iron liquid quality;
5) through after the above processing, iron liquid is poured into casting mold, pouring temperature is the wind-powered electricity generation foundry goods that availability meets the demands at 1300 degrees centigrade～1340 degrees centigrade after slowly cooling off.
Heating up in the iron liquid adding electric arc furnace that obtains behind the said blast furnace smelting, adjustment is with composition: the iron liquid that obtains behind the blast furnace smelting, after process thermometric and chemical ingredients are analysed, confirm its temperature and composition; Then, add in the electric arc furnace, obtain the composition and the temperature of original iron melt as required, smelt, adjustment composition and temperature are till obtaining satisfactory base iron.
Said base iron temperature and composition specific requirement are: 1450～1480 degrees centigrade of temperature, composition quality per-cent are 3.5%～3.8%C, 0.8%～1.2%Si; 0.1%～0.3%Mn;＜0.07%P,＜0.07%S, surplus is Fe and inevitable trace impurity.
Through nodularization, breed handle with microalloying after, the ultimate constituent mass percent of the ductile iron liquid of acquisition is: 3.5%～3.8%C, 1.8%～2.2%Si, 0.1%～0.3%Mn,＜0.04%P,＜0.03%S, 0.04%～0.07%Mg; 0.02%～0.04%RE, 0.01%～0.02%Sb, all the other are Fe and inevitable trace impurity.
The invention has the beneficial effects as follows: electric arc furnace can be controlled metallurgical process, thereby accurately control the chemical ingredients of iron liquid easily through the control melting technology, makes it to satisfy the requirement that the large-scale wind electricity nodular iron casting is produced.Shortened process is enhanced productivity greatly, practices thrift cost, to energy-saving and cost-reducing significant.
Embodiment
Below in conjunction with embodiment, further specify characteristic of the present invention and effect.
Embodiment 1
The molten iron that blast furnace smelting obtains, its temperature is 1200 degrees centigrade, chemical ingredients (mass percent) is 4.1%C, 0.8%Si, 0.6%Mn, 0.3%P, 0.2%S, surplus is Fe and inevitable trace impurity.Be poured in the electric arc furnace, heat up, through decarburization, increase silicon, fall manganese, after melting technologies such as desulfurization, dephosphorization handle; The composition (mass percent) that obtains base iron is 3.6%C, 0.9%Si, 0.2%Mn;＜0.04%P;＜0.06%S, surplus is Fe and inevitable trace impurity, temperature is 1450 degrees centigrade.
Use re-si-mg alloy to carry out spheroidizing this base iron, and then use ferro-silicon to carry out inoculation.After disposing, add the metal Sb of trace, the chemical ingredients (mass percent) of handling the final iron liquid of back acquisition is 3.5%C, 1.9%Si, 0.2%Mn, 0.04%P, 0.03%S, 0.05%Mg; 0.02%RE, 0.02%Sb, all the other are Fe and inevitable trace impurity.When this iron liquid is left standstill 1320 degrees centigrade of temperature, be molded in the wind-powered electricity generation unit wheel hub casts casting mold of 3MW, solidify the cooling cleaning of unpacking after 60 hours and obtain foundry goods.Foundry goods is carried out the analysis of body structure property, and the result shows that nodulizing grade is 2 grades, 5 grades of graphite pebbles sizes, room temperature tensile strength 420MPa, room temperature impelling strength MV 40J, Schwellenwert 26J ,-20 ℃ of impelling strength MV 12J, Schwellenwert 10J.Meet the requirement of wind-powered electricity generation foundry goods.
Embodiment 2
The molten iron that blast furnace smelting obtains, its temperature is 1260 degrees centigrade, chemical ingredients (mass percent) is 4.3%C, 1.2%Si, 0.5%Mn, 0.2%P, 0.2%S, surplus is Fe and inevitable trace impurity.Be poured in the electric arc furnace, heat up, through decarburization, increase silicon, fall manganese, after melting technologies such as desulfurization, dephosphorization handle; The composition (mass percent) that obtains base iron is 3.8%C, 1.2%Si, 0.2%Mn;＜0.05%P;＜0.06%S, surplus is Fe and inevitable trace impurity, temperature is 1460 degrees centigrade.
Use re-si-mg alloy that base iron is carried out spheroidizing, and then use ferro-silicon to carry out inoculation.After disposing, add the metal Sb of trace, the chemical ingredients (mass percent) of handling the final iron liquid of back acquisition is 3.8%C, 2.1%Si, 0.2%Mn, 0.05%P, 0.03%S, 0.06%Mg; 0.03%RE, 0.01%Sb, all the other are Fe and inevitable trace impurity.When this iron liquid is left standstill 1330 degrees centigrade of temperature, be molded in the wind-powered electricity generation unit wheel hub casts casting mold of 2MW, solidify the cooling cleaning of unpacking after 50 hours and obtain foundry goods.Foundry goods is carried out the analysis of body structure property, and the result shows that nodulizing grade is 2 grades, 5 grades of graphite pebbles sizes, room temperature tensile strength 415MPa, room temperature impelling strength MV 41J, Schwellenwert 28J ,-20 ℃ of impelling strength MV 14J, Schwellenwert 11J.Meet the requirement of wind-powered electricity generation foundry goods.
Claims (4)
1. the method for a blast-melted production wind-powered electricity generation foundry goods is primarily characterized in that: comprising:
1), adds and heat up in the electric arc furnace and the composition adjustment with the iron liquid that obtains behind the blast furnace smelting;
2) after original iron melt temperature and composition reach requirement, original iron melt is poured in the casting ladle, carried out desulfurization and spheroidizing with nodulizing agent; Described nodulizing agent is a re-si-mg alloy; The add-on of nodulizing agent is the 0.8-1.0% of iron liquid quality;
3) the iron liquid after the desulfurization spheroidizing is added nucleating agent and carry out inoculation; Nucleating agent is a ferro-silicon; The add-on of nucleating agent is the 0.4-0.6% of iron liquid quality;
4) iron liquid is carried out microalloying: the original iron melt after nodularization and the inoculation is added trace metal Sb carry out microalloying; Trace metal Sb add-on is 0.1% of an iron liquid quality;
5) through after the above processing, iron liquid is poured into casting mold, pouring temperature is the wind-powered electricity generation foundry goods that availability meets the demands at 1300 degrees centigrade～1340 degrees centigrade after slowly cooling off.
2. the method for a kind of blast-melted production wind-powered electricity generation foundry goods according to claim 1; It is characterized in that; Heating up in the iron liquid adding electric arc furnace that obtains behind the said blast furnace smelting, adjustment is: the iron liquid that obtains behind the blast furnace smelting with composition; After process thermometric and chemical ingredients are analysed, confirm its temperature and composition; Then, add in the electric arc furnace, obtain the composition and the temperature of original iron melt as required, smelt, adjustment composition and temperature are till obtaining satisfactory base iron.
3. the method for a kind of blast-melted production wind-powered electricity generation foundry goods according to claim 2 is characterized in that, said base iron temperature and composition specific requirement are: 1450～1480 degrees centigrade of temperature; Composition quality per-cent is 3.5%～3.8%C; 0.8%～1.2%Si, 0.1%～0.3%Mn,＜0.07%P;＜0.07%S, surplus is Fe and inevitable trace impurity.
4. the method for a kind of blast-melted production wind-powered electricity generation foundry goods according to claim 1 is characterized in that, through nodularization, breed handle with microalloying after; The ultimate constituent mass percent of the ductile iron liquid that obtains is: 3.5%～3.8%C; 1.8%～2.2%Si, 0.1%～0.3%Mn,＜0.04%P;＜0.03%S, 0.04%～0.07%Mg; 0.02%～0.04%RE, 0.01%～0.02%Sb, all the other are Fe and inevitable trace impurity.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103882175A (en) * | 2014-03-31 | 2014-06-25 | 江苏力源金河铸造有限公司 | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron |
| CN104988381A (en) * | 2015-07-17 | 2015-10-21 | 江苏吉鑫风能科技股份有限公司 | Large-section cast ferrite nodular cast iron and preparation method thereof |
| CN110284050A (en) * | 2019-07-29 | 2019-09-27 | 河北恒工机械装备科技有限公司 | A kind of Large-cross-section nodular cast iron profile and technique preventing chunky graphite formation |
| CN116254454A (en) * | 2022-11-18 | 2023-06-13 | 昌黎县众创精密机件有限公司 | Method for producing nodular cast iron profile by short-process arc continuous casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882175A (en) * | 2014-03-31 | 2014-06-25 | 江苏力源金河铸造有限公司 | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron |
| CN103882175B (en) * | 2014-03-31 | 2016-04-27 | 江苏力源金河铸造有限公司 | The method of a kind of molten iron production two kinds of trade mark low-temperature spheroidal irons |
| CN104988381A (en) * | 2015-07-17 | 2015-10-21 | 江苏吉鑫风能科技股份有限公司 | Large-section cast ferrite nodular cast iron and preparation method thereof |
| CN110284050A (en) * | 2019-07-29 | 2019-09-27 | 河北恒工机械装备科技有限公司 | A kind of Large-cross-section nodular cast iron profile and technique preventing chunky graphite formation |
| CN116254454A (en) * | 2022-11-18 | 2023-06-13 | 昌黎县众创精密机件有限公司 | Method for producing nodular cast iron profile by short-process arc continuous casting |
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Application publication date: 20120111 |