CN101787403B - Short process production technique for preparing casting of wind power generation equipment - Google Patents
Short process production technique for preparing casting of wind power generation equipment Download PDFInfo
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- CN101787403B CN101787403B CN2010101028326A CN201010102832A CN101787403B CN 101787403 B CN101787403 B CN 101787403B CN 2010101028326 A CN2010101028326 A CN 2010101028326A CN 201010102832 A CN201010102832 A CN 201010102832A CN 101787403 B CN101787403 B CN 101787403B
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Abstract
The invention discloses a short process production technique for preparing a casting of wind power generation equipment, relates to the manufacturing of cast iron alloy and is a short process production technique for preparing a thick and large section casting of the wind power generation equipment; the short process production technique includes that: molten iron obtained through the sintering of iron ore and the reduction of blast furnace smelting receives dephosphorization and desulfurization treatment and is injected into a medium-frequency induction furnace for smelting continuously with steel scrap and scrap returns, meanwhile the composition of the molten iron is regulated, and then spheroidization and inoculation are carried out to obtain the thick and large section casting for the wind power generation equipment after the final step of cast molding. The invention adopts the short process technique and accordingly improves the production efficiency; a cupola furnace is replaced by the medium-frequency induction furnace to accurately control the impurities and temperature of the molten iron and also have the effects of environmental protection and energy-saving and consumption reduction; core-spun yarns are adopted for the processes of dephosphorization, desulfurization, spheroidization and inoculation so that the treatments are quick and efficient, the number of graphite balls is effectively increased, and the thick and large section casting of high quality for the wind power generation equipment is obtained.
Description
Technical field
Technical scheme of the present invention relates to the manufacturing of cast iron alloy, specifically a kind of productive technology of short flow for preparing casting of wind power generation equipment.
Background technology
The important composition parts of wind power plant are foundry goods mostly, and for example the wheel hub of blade, gear housing and mechanical stand etc. all are foundry goods in the wind power generation plant.Because wind power plant usually is installed on the inland or ocean of high height above sea level, temperature is lower, Working environment is more abominable, and wind power plant is huge, especially the position of parts such as gear housing and wheel hub installation is higher, therefore lifting and maintenance all are difficult for carrying out, and this just requires these foundry goods reliablely and stablely to move more than 20 years.In addition, the foundry goods of aerogenerator mostly is main bearing part, so require these massive casting when using reliably and with long-term, also has stable mechanical property.
Because the mechanical property of spheroidal graphite cast iron is much better than graphitic pig iron, even approaches steel, and has good castability, so casting of wind power generation equipment adopts spheroidal graphite cast iron more.Along with wind power plant develops to large vol, high quality and high life direction, require the size of casting of wind power generation equipment to increase gradually, also with regard to increasing (can reach more than the 200mm), this makes casting of wind power generation equipment be classified as the category of thick and large section casting parts to its section.But the increase of thickness tends to produce problems such as foundry goods core abnormal nodularizing, and this can influence the use properties of thick and large section casting parts.In order to comply with the trend that casting of wind power generation equipment cross dimensions and thickness increase, must guarantee that wind power plant has stable mechanical property with thick and large section casting parts and guarantees that they have good toughness under microthermal climate and various severe environment, therefore requirements at the higher level have just been proposed its production technique, comprise the chemical ingredients of wanting strict control foundry goods, promptly to reduce the wherein content of P and S impurity, the content of strict control Mn and Si, guarantee the excellent metallurgical quality, will guarantee good nodularization and pregnant effect in addition.
Current, the conventional Production Flow Chart of casting of wind power generation equipment is: blast-melted casting cooling forms pig iron, arrives foundry through transportation, again with it with meltings in cupola furnace such as steel scrap and foundry returns, after spheroidization and inoculation, pour into a mould again.Ironmaking and casting are two links of separating in this flow process, and blast-melted heat is by loss and waste, and the remelting of the pig iron can cause air-breathing again and impurity increases in cupola furnace, and making influence the increase of the labile factor of metallurgical quality.Simultaneously, the general employing poured method and carried out spheroidizing in the above-mentioned flow process, promptly molten iron poured into the bottom and added in the nodularization bag of nodulizing agent, and this method efficient is low and seriously polluted, and the nodularization effect is not good yet; Breed the mode that then employing is repeatedly bred, comprise with stream method, mould cavity inoculation and sprue cup and educate methods such as silk breeds, in the preparation process of thick and large section casting parts, be prone to the decaying spheroidisation phenomenon, can't increase number of graphite ball effectively.In addition, be the cupola furnace of fuel with the coke, can give off a large amount of CO in the fusion process
2And SO
2, environment is polluted, run counter to and reduce greenhouse gas emission and energy-saving and cost-reducing megatrend in the world.This shows, be necessary very much to improve the technological process of production of existing casting of wind power generation equipment.
CN101348846A discloses blast furnace-intermediate frequency furnace duplexing smelting short process production technology, though wherein mention the short flow process technology of melting, does not relate to the production of casting of wind power generation equipment and the thick and large section problem of foundry goods.CN101407884A has disclosed the melting technology of a kind of wind energy plant with foundry goods, the melting technology of wherein said cast of wind energy apparatus is the new pig iron and steel scrap to be put into electric melting furnace melt, then the heat of molten iron is wasted in the blast furnace, and the remelting of the pig iron can cause disadvantageous effect to the quality of molten iron in the electric furnace, breeding in this patent technology need just can be finished for four times simultaneously, spheroidization and inoculation process complexity, wayward.
Summary of the invention
Technical problem to be solved by this invention is: a kind of productive technology of short flow for preparing casting of wind power generation equipment is provided, owing to adopt abbreviated system, the molten iron that comes out from blast furnace pours into pig iron without cooling, handle directly injection medium-frequency induction furnace of back in dephosphorization treatment and desulfurization, in medium-frequency induction furnace, carry out the composition adjustment, after spheroidization and inoculation casting, thereby having overcome prior art uses in the production of thick and large section casting parts at wind power plant, the instability of metallurgical quality, the nodularization poor effect, the spheroidization and inoculation process is complicated and wayward, be prone to the decaying spheroidisation phenomenon in the preparation process, can't increase number of graphite ball effectively, and the many shortcomings that cause environmental pollution.
The present invention solves this technical problem the technical scheme that is adopted: a kind of productive technology of short flow for preparing casting of wind power generation equipment is a kind of productive technology of short flow for preparing wind power plant with thick and large section casting parts, and concrete steps are as follows:
The first step, the sintering of iron ore and blast furnace smelting reduction
Iron ore is pulverized and the smart powder of iron is made in magnetic separation, then iron essence powder sintering is become agglomerate, again agglomerate is delivered in 1500 ℃～1550 ℃ the blast furnace, with coke the agglomerate smelting reduction is become molten iron through hot blast;
In second step, dephosphorization and desulfurization are handled
The molten iron that the first step is obtained goes in the insulation bag, the insulation bag is transported to the feeding wire machine place by track, feeding wire machine feeds the cored-wire with thin steel band parcel dephosphorizing agent in this insulation bag, this dephosphorizing agent add-on is 2%～5% of this molten steel quality per-cent, and this dephosphorizing agent is to be CaO 42%～45%, Fe by composition
2O
344%～46% and CaF
29%～14% powder mass of making simultaneously feeds the nitrogen gas generation eddy flow to this insulation bag bottom, and wherein molten iron is stirred dephosphorization, and after this, feeding wire machine is with thin steel band parcel CaC
2The cored-wire of sweetening agent feeds in this insulation bag, and this sweetening agent add-on is 0.8%～2% of this molten steel quality per-cent, feeds the nitrogen gas generation eddy flow to this insulation bag bottom simultaneously, stirs, and makes the desulfurizing iron in this insulation bag, skims then;
The 3rd step, the adjustment of medium-frequency induction furnace melting and hot metal composition
Molten iron after the second step dephosphorization and the desulfurization processing is injected medium-frequency induction furnace carry out melting, the temperature of medium-frequency induction furnace is controlled at 1480 ℃～1500 ℃, molten iron is carried out after spectral detection analyzes composition, be molten iron 75%～80% by mass percentage, the ratio of foundry returns 10%～12.5% and steel scrap 10%～12.5%, foundry returns and steel scrap added carry out the hot metal composition adjustment in this medium-frequency induction furnace, making the C in the molten iron is 3.45%～3.55%, Si is 0.6%～0.7%, this molten iron, foundry returns and steel scrap carry out the medium-frequency induction furnace melting together under the induction stirring condition, described foundry returns is the underproof foundry goods that carries out remelting;
The 4th step, nodularization and inoculation
The molten iron that the medium-frequency induction furnace melting of the 3rd step is come out injects casting ladle, casting ladle moves to the feeding wire machine place by track, when the molten iron temperature in casting ladle is 1440 ℃～1450 ℃, feeding wire machine feeds the cored-wire with thin steel band parcel yttrium-base heavy rare earth composite nodulizer powder in this molten iron, feed nitrogen from this casting ladle bottom simultaneously, carry out spheroidizing, this nodulizing agent add-on is 1.5%～1.6% of this molten steel quality per-cent, after the spheroidizing, feeding wire machine feeds the cored-wire with thin steel band parcel nucleating agent powder in this molten iron again, feed nitrogen from this casting ladle bottom simultaneously, carry out inoculation, this innoculant adding quantity is 1.25%～1.35% of this molten steel quality per-cent, skim then, described yttrium-base heavy rare earth composite nodulizer is to be Mg6.5%～8.5% by composition, Re 2%～3.5%, Si 45%～50%, Ca 1%～2%, Ba 1%～2% and all the other powder masss of making for Fe, Y accounts for 50%～60% among the above-mentioned Re, and described nucleating agent is to be Si 70%～75% by composition, Ba 1%～3%, Ca 0.75%～1.5% and all the other powder masss of making for Fe;
The 5th step, casting
Molten iron after the 4th step nodularization and the inoculation is directly poured into the wind power plant thick and large section casting parts, and the wind power plant that makes thus with the final chemical ingredients of thick and large section casting parts is: C 3.4%～3.5%, Si 1.9%～2.0%, Mn≤0.25%, S≤0.015%, P≤0.035%, Ti≤0.035%, Re≤0.015, Mg 0.045%～0.06% and all the other are Fe;
Above-mentioned cored-wire all is meant the filamentary material made from thin steel band parcel desired substance powder, and above-mentioned all percentage ratios are mass percent.
Above-mentioned a kind of productive technology of short flow for preparing casting of wind power generation equipment, wherein to pour into wind power plant be 100mm～300mm with the section radial dimension of thick and large section casting parts the 5th step.
Above-mentioned a kind of productive technology of short flow for preparing casting of wind power generation equipment, wherein involved equipment blast furnace, insulation bag, feeding wire machine, medium-frequency induction furnace and casting ladle are the known general-purpose equipment of this technical field; Involved pulverizing, magnetic separation, sintering, melting, induction stirring and pouring technology are the known ordinary process of this technical field; Make the raw material of dephosphorizing agent, sweetening agent, nodulizing agent, nucleating agent and cored-wire and method and be that this technical field those of ordinary skill can know and grasp.
The invention has the beneficial effects as follows:
Compare with the production technique of thick and large section casting parts with conventional wind power plant, the present invention has the following advantages:
(1) technology of the present invention is owing to adopt abbreviated system, the molten iron that comes out from blast furnace is without cooling and pour into pig iron, thereby avoided the molten iron heat by loss and waste, also saved the time of pig iron cooling and remelting, improved production efficiency, and when in medium-frequency induction furnace, adding steel scrap and foundry returns,, improved the melting efficiency after steel scrap and foundry returns add because just there is molten iron in this in the medium-frequency induction furnace.
(2) in technology of the present invention, owing to replace cupola furnace with medium-frequency induction furnace, medium-frequency induction furnace does not use coke, thereby does not have carburetting to increase the problem of sulphur, and the composition of molten iron is more stable; The medium-frequency induction furnace controllability is good, and is higher to the precision of molten iron temperature control; Owing to saved blast-melted cooling and pig iron remelting, make air-breathing and be mingled with minimizing, thereby reach the effect of purifying molten iron.These characteristics of the present invention have guaranteed that wind power plant is good with the metallurgical quality of thick and large section casting parts, the product percent of pass height.
(3) in technology of the present invention, molten iron carries out induction stirring in medium-frequency induction furnace, makes that the composition of molten iron and temperature are even, and composition is easy to adjust, helps obtaining high quality wind power plant thick and large section casting parts.
(4) process using medium-frequency induction furnace of the present invention replaces cupola furnace to carry out melting, adopts the electric energy coke for replacing to act as a fuel, and has reduced because of CO
2And SO
2Discharging is played protection environment and energy-saving and cost-reducing effect to atmospheric pollution.
(5) in the technology of the present invention, dephosphorization, desulfurization, nodularization and breed and all use its cored-wire make dephosphorization, desulfurization, nodularization and inoculation instant effect and efficient height, the simple and control easily of spheroidization and inoculation process, the decaying spheroidisation phenomenon can not occur in the preparation process, increase number of graphite ball effectively.Cored-wire is fed method in the molten iron fast with feeding wire machine, compare with traditional dephosphorization, desulfurization, nodularization and inoculation method, react more abundant, consumption is more saved, and effect is better.In addition, the cored-wire method is safe and reliable, and is little to environmental influence, all having good result aspect hot metal composition adjustment, dephosphorization and desulfurization removal of impurities and the spheroidization and inoculation, promoted molten steel quality thus, guarantees the final fine wind power plant thick and large section casting parts that obtains.
(6) though mention the short flow process technology of melting in the disclosed blast furnace of CN101348846A-intermediate frequency furnace duplexing smelting short process production technology, but not carrying out dephosphorization and desulfurization in this technology handles, molten iron is impure more, molten iron is not carried out the nodularization process yet, therefore this technology is difficult to be applied to spheroidal graphite cast iron production, more can not be used for the production of wind power plant with thick and large section casting parts.Handle and in technology of the present invention, carried out dephosphorization and desulfurization, make molten iron purer, also use cored-wire that molten iron is carried out spheroidizing, good nodularization effect is arranged, help improving the performance of foundry goods, thereby technology of the present invention can be applicable to the production of wind power plant with thick and large section casting parts fully.
In sum, the present invention adopts abbreviated system, improved production efficiency, guaranteed that hot metal composition is stable, the impurity in the molten iron and the temperature of molten iron are able to accurate control, the dephosphorization of molten iron, desulfurization, nodularization and pregnant effect are good, thereby obtain good metallurgical quality and good nodularization effect, make the wind power plant of producing have excellent mechanical property and low-temperature flexibility with thick and large section casting parts.Than existing technology of producing the wind-power electricity generation foundry goods, a kind of productive technology of short flow for preparing casting of wind power generation equipment of the present invention has outstanding substantive distinguishing features and obvious improvement.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a kind of schema for preparing the productive technology of short flow of casting of wind power generation equipment of the present invention.
Embodiment
Fig. 1 brief description a kind of productive technology of short flow for preparing casting of wind power generation equipment of the present invention: the molten iron that obtains through the sintering of iron ore and blast furnace smelting reduction is after dephosphorization and desulfurization are handled, inject medium-frequency induction furnace and add steel scrap and foundry returns continuation melting, carry out the adjustment of hot metal composition simultaneously, adopt the cored-wire method to carry out nodularization and inoculation then, last casting makes the wind power plant thick and large section casting parts.
Embodiment 1
The first step, the sintering of iron ore and blast furnace smelting reduction
Iron ore is pulverized and the smart powder of iron is made in magnetic separation, then iron essence powder sintering is become agglomerate, again agglomerate is delivered in 1500 ℃ the blast furnace, with coke the agglomerate smelting reduction is become molten iron through hot blast;
In second step, dephosphorization and desulfurization are handled
The molten iron that the first step is obtained goes in the insulation bag, the insulation bag is transported to the feeding wire machine place by track, feeding wire machine feeds the cored-wire with thin steel band parcel dephosphorizing agent during this insulation wraps, and this dephosphorizing agent add-on is 2% of this molten steel quality per-cent, and this dephosphorizing agent is to be CaO 42%, Fe by composition
2O
344% and CaF
214% powder mass of making simultaneously feeds the nitrogen gas generation eddy flow to this insulation bag bottom, and wherein molten iron is stirred dephosphorization, and after this, feeding wire machine is with thin steel band parcel CaC
2The cored-wire of sweetening agent feeds in this insulation bag, and this sweetening agent add-on is 0.8% of this molten steel quality per-cent, feeds the nitrogen gas generation eddy flow to this insulation bag bottom simultaneously, stirs, and makes the desulfurizing iron in this insulation bag, skims then;
The 3rd step, the adjustment of medium-frequency induction furnace melting and hot metal composition
Molten iron after the second step dephosphorization and the desulfurization processing is injected medium-frequency induction furnace carry out melting, the temperature of medium-frequency induction furnace is controlled at 1480 ℃, molten iron is carried out after spectral detection analyzes composition, be the ratio of molten iron 75%, foundry returns 12.5% and steel scrap 12.5% by mass percentage, foundry returns and steel scrap added carry out the hot metal composition adjustment in this medium-frequency induction furnace, make that C in the molten iron is 3.45%, Si is 0.6%, this molten iron, foundry returns and steel scrap carry out the medium-frequency induction furnace melting together under the induction stirring condition;
The 4th step, nodularization and inoculation
The molten iron that the medium-frequency induction furnace melting of the 3rd step is come out injects casting ladle, casting ladle moves to the feeding wire machine place by track, when the molten iron temperature in casting ladle is 1440 ℃, feeding wire machine feeds the cored-wire with thin steel band parcel yttrium-base heavy rare earth composite nodulizer powder in this molten iron, feed nitrogen from this casting ladle bottom simultaneously, carry out spheroidizing, this nodulizing agent add-on is 1.5% of this molten steel quality per-cent, after the spheroidizing, feeding wire machine feeds the cored-wire with thin steel band parcel nucleating agent powder in this molten iron again, feed nitrogen from this casting ladle bottom simultaneously, carry out inoculation, this innoculant adding quantity is 1.25% of this molten steel quality per-cent, skim then, described yttrium-base heavy rare earth composite nodulizer is to be Mg 6.5% by composition, Re 2%, Si 45%, Ca 1%, Ba 1% and all the other are the powder mass that Fe makes, and Y accounts for 50% among the above-mentioned Re, and described nucleating agent is to be Si 70% by composition, Ba 1%, Ca 0.75% and all the other powder masss of making for Fe;
The 5th step, casting
Molten iron after the 4th step nodularization and the inoculation is directly poured into the wind power plant thick and large section casting parts that the section radial dimension is 100mm, and the wind power plant that makes thus is that C3.4%, Si 1.9%, Mn≤0.25%, S≤0.015%, P≤0.035%, Ti≤0.035%, Re≤0.015, Mg 0.045% and all the other are Fe with the final chemical ingredients of thick and large section wind-powered electricity generation foundry goods.
Embodiment 2
The first step, the sintering of iron ore and blast furnace smelting reduction
Iron ore is pulverized and the smart powder of iron is made in magnetic separation, then iron essence powder sintering is become agglomerate, again agglomerate is delivered in 1525 ℃ the blast furnace, with coke the agglomerate smelting reduction is become molten iron through hot blast;
In second step, dephosphorization and desulfurization are handled
The molten iron that the first step is obtained goes in the insulation bag, the insulation bag is transported to the feeding wire machine place by track, feeding wire machine feeds the cored-wire with thin steel band parcel dephosphorizing agent during this insulation wraps, and this dephosphorizing agent add-on is 3.5% of this molten steel quality per-cent, and this dephosphorizing agent is to be CaO 44%, Fe by composition
2O
345% and CaF
211% powder mass of making simultaneously feeds the nitrogen gas generation eddy flow to this insulation bag bottom, and wherein molten iron is stirred dephosphorization, and after this, feeding wire machine is with thin steel band parcel CaC
2The cored-wire of sweetening agent feeds in this insulation bag, and this sweetening agent add-on is 1.4% of this molten steel quality per-cent, feeds the nitrogen gas generation eddy flow to this insulation bag bottom simultaneously, stirs, and makes the desulfurizing iron in this insulation bag, skims then;
The 3rd step, the adjustment of medium-frequency induction furnace melting and hot metal composition
Molten iron after the second step dephosphorization and the desulfurization processing is injected medium-frequency induction furnace carry out melting, the temperature of medium-frequency induction furnace is controlled at 1490 ℃, molten iron is carried out after spectral detection analyzes composition, be the ratio of molten iron 77%, foundry returns 11.5% and steel scrap 11.5% by mass percentage, foundry returns and steel scrap added carry out the hot metal composition adjustment in this medium-frequency induction furnace, make that C in the molten iron is 3.5%, Si is 0.65%, this molten iron, foundry returns and steel scrap carry out the medium-frequency induction furnace melting together under the induction stirring condition;
The 4th step, nodularization and inoculation
The molten iron that the medium-frequency induction furnace melting of the 3rd step is come out injects casting ladle, casting ladle moves to the feeding wire machine place by track, when the molten iron temperature in casting ladle is 1445 ℃, feeding wire machine feeds the cored-wire with thin steel band parcel yttrium-base heavy rare earth composite nodulizer powder in this molten iron, feed nitrogen from this casting ladle bottom simultaneously, carry out spheroidizing, this nodulizing agent add-on is 1.55% of this molten steel quality per-cent, after the spheroidizing, feeding wire machine feeds the cored-wire with thin steel band parcel nucleating agent powder in this molten iron again, feed nitrogen from this casting ladle bottom simultaneously, carry out inoculation, this innoculant adding quantity is 1.3% of this molten steel quality per-cent, skim then, described yttrium-base heavy rare earth composite nodulizer is to be Mg 7% by composition, Re 2.5%, Si 47%, Ca 1.5%, Ba 1.5% and all the other are the powder mass that Fe makes, and Y accounts for 55% among the above-mentioned Re, and described nucleating agent is to be Si 72% by composition, Ba 2%, Ca 1% and all the other powder masss of making for Fe;
The 5th step, casting
Molten iron after the 4th step nodularization and the inoculation is directly poured into the wind power plant thick and large section casting parts that the section radial dimension is 200mm, and the wind power plant that makes thus is that C3.44%, Si 1.95%, Mn≤0.25%, S≤0.015%, P≤0.035%, Ti≤0.035%, Re≤0.015, Mg 0.053% and all the other are Fe with the final chemical ingredients of thick and large section wind-powered electricity generation foundry goods.
Embodiment 3
The first step, the sintering of iron ore and blast furnace smelting reduction
Iron ore is pulverized and the smart powder of iron is made in magnetic separation, then iron essence powder sintering is become agglomerate, again agglomerate is delivered in 1550 ℃ the blast furnace, agglomerate is reduced into molten iron through hot blast and coke;
In second step, dephosphorization and desulfurization are handled
The molten iron that the first step is obtained goes in the insulation bag, the insulation bag is transported to the feeding wire machine place by track, feeding wire machine feeds the cored-wire with thin steel band parcel dephosphorizing agent during this insulation wraps, and this dephosphorizing agent add-on is 5% of this molten steel quality per-cent, and this dephosphorizing agent is to be CaO 45%, Fe by composition
2O
346% and CaF
29% powder mass of making simultaneously feeds the nitrogen gas generation eddy flow to this insulation bag bottom, and wherein molten iron is stirred dephosphorization, and after this, feeding wire machine is with thin steel band parcel CaC
2The cored-wire of sweetening agent feeds in this insulation bag, and this sweetening agent add-on is 2% of this molten steel quality per-cent, feeds the nitrogen gas generation eddy flow to this insulation bag bottom simultaneously, stirs, and makes the desulfurizing iron in this insulation bag, skims then;
The 3rd step, the adjustment of medium-frequency induction furnace melting and composition
Molten iron after the second step dephosphorization and the desulfurization processing is injected medium-frequency induction furnace carry out melting, the temperature of medium-frequency induction furnace is controlled at 1500 ℃, molten iron is carried out after spectral detection analyzes composition, be the ratio of molten iron 80%, foundry returns 10% and steel scrap 10% by mass percentage, foundry returns and steel scrap added carry out the hot metal composition adjustment in this medium-frequency induction furnace, make C 3.55%, Si 0.7% in the molten iron, this molten iron, foundry returns and steel scrap carry out the medium-frequency induction furnace melting together under the induction stirring condition;
The 4th step, nodularization and inoculation
The molten iron that the medium-frequency induction furnace melting of the 3rd step is come out injects casting ladle, casting ladle moves to the feeding wire machine place by track, when the molten iron temperature in casting ladle is 1450 ℃, feeding wire machine feeds the cored-wire with thin steel band parcel yttrium-base heavy rare earth composite nodulizer powder in this molten iron, feed nitrogen from this casting ladle bottom simultaneously, carry out spheroidizing, this nodulizing agent add-on is 1.6% of this molten steel quality per-cent, after the spheroidizing, feeding wire machine feeds the cored-wire with thin steel band parcel nucleating agent powder in this molten iron again, feed nitrogen from this casting ladle bottom simultaneously, carry out inoculation, this innoculant adding quantity is 1.35% of this molten steel quality per-cent, skim then, described yttrium-base heavy rare earth composite nodulizer is to be Mg 8.5% by composition, Re 3.5%, Si 50%, Ca 2%, Ba 2% and all the other are the powder mass that Fe makes, and Y accounts for 60% among the above-mentioned Re, and described nucleating agent is to be Si 75% by composition, Ba 3%, Ca 1.5% and all the other powder masss of making for Fe;
The 5th step, casting
Molten iron after the 4th step nodularization and the inoculation is directly poured into the wind power plant thick and large section casting parts that the section radial dimension is 300mm, and the wind power plant that makes thus is that C3.5%, Si 2.0%, Mn≤0.25%, S≤0.015%, P≤0.035%, Ti≤0.035%, Re≤0.015, Mg 0.06% and all the other are Fe with the final chemical ingredients of thick and large section wind-powered electricity generation foundry goods.
Foundry returns described in the foregoing description is the underproof foundry goods that carries out remelting.
Cored-wire described in the foregoing description all is filamentary materials made from thin steel band parcel desired substance powder.
Used percentage ratio is mass percent in the foregoing description.
Equipment blast furnace, insulation bag, feeding wire machine, medium-frequency induction furnace and casting ladle involved in the foregoing description are the known general-purpose equipment of this technical field; The spectral detection of involved pulverizing, magnetic separation, sintering, melting, molten iron, induction stirring and pouring technology are the known ordinary process operation of this technical field; Make the raw material of dephosphorizing agent, sweetening agent, nodulizing agent, nucleating agent and cored-wire and method and be that this technical field those of ordinary skill can know and grasp.
Claims (1)
1. productive technology of short flow for preparing casting of wind power generation equipment is characterized in that: be a kind of productive technology of short flow for preparing wind power plant with thick and large section casting parts, concrete steps are as follows:
The first step, the sintering of iron ore and blast furnace smelting reduction
Iron ore is pulverized and the smart powder of iron is made in magnetic separation, then iron essence powder sintering is become agglomerate, again agglomerate is delivered in 1500 ℃～1550 ℃ the blast furnace, with coke the agglomerate smelting reduction is become molten iron through hot blast;
In second step, dephosphorization and desulfurization are handled
The molten iron that the first step is obtained goes in the insulation bag, the insulation bag is transported to the feeding wire machine place by track, feeding wire machine feeds the cored-wire with thin steel band parcel dephosphorizing agent in this insulation bag, this dephosphorizing agent add-on is 2%～5% of this molten steel quality per-cent, and this dephosphorizing agent is to be CaO 42%～45%, Fe by composition
2O
344%～46% and CaF
29%～14% powder mass of making simultaneously feeds the nitrogen gas generation eddy flow to this insulation bag bottom, and wherein molten iron is stirred dephosphorization, and after this, feeding wire machine is with thin steel band parcel CaC
2The cored-wire of sweetening agent feeds in this insulation bag, and this sweetening agent add-on is 0.8%～2% of this molten steel quality per-cent, feeds the nitrogen gas generation eddy flow to this insulation bag bottom simultaneously, stirs, and makes the desulfurizing iron in this insulation bag, skims then;
The 3rd step, the adjustment of medium-frequency induction furnace melting and hot metal composition
Molten iron after the second step dephosphorization and the desulfurization processing is injected medium-frequency induction furnace carry out melting, the temperature of medium-frequency induction furnace is controlled at 1480 ℃～1500 ℃, molten iron is carried out after spectral detection analyzes composition, be molten iron 75%～80% by mass percentage, the ratio of foundry returns 10%～12.5% and steel scrap 10%～12.5%, foundry returns and steel scrap added carry out the hot metal composition adjustment in this medium-frequency induction furnace, making the C in the molten iron is 3.45%～3.55%, Si is 0.6%～0.7%, this molten iron, foundry returns and steel scrap carry out the medium-frequency induction furnace melting together under the induction stirring condition, described foundry returns is the underproof foundry goods that carries out remelting;
The 4th step, nodularization and inoculation
The molten iron that the medium-frequency induction furnace melting of the 3rd step is come out injects casting ladle, casting ladle moves to the feeding wire machine place by track, when the molten iron temperature in casting ladle is 1440 ℃～1450 ℃, feeding wire machine feeds the cored-wire with thin steel band parcel yttrium-base heavy rare earth composite nodulizer powder in this molten iron, feed nitrogen from this casting ladle bottom simultaneously, carry out spheroidizing, this nodulizing agent add-on is 1.5%～1.6% of this molten steel quality per-cent, after the spheroidizing, feeding wire machine feeds the cored-wire with thin steel band parcel nucleating agent powder in this molten iron again, feed nitrogen from this casting ladle bottom simultaneously, carry out inoculation, this innoculant adding quantity is 1.25%～1.35% of this molten steel quality per-cent, skim then, described yttrium-base heavy rare earth composite nodulizer is to be Mg 6.5%～8.5% by composition, Re 2%～3.5%, Si 45%～50%, Ca 1%～2%, Ba 1%～2% and all the other powder masss of making for Fe, Y accounts for 50%～60% among the above-mentioned Re, and described nucleating agent is to be Si 70%～75% by composition, Ba 1%～3%, Ca 0.75%～1.5% and all the other powder masss of making for Fe;
The 5th step, casting
Molten iron after the 4th step nodularization and the inoculation is directly poured into the wind power plant thick and large section casting parts, the wind power plant that makes thus with the final chemical ingredients of thick and large section casting parts is: C 3.4%～3.5%, Si 1.9%～2.0%, Mn≤0.25%, S≤0.015%, P≤0.035%, Ti≤0.035%, Re≤0.015, Mg 0.045%～0.06% and all the other are Fe, and this step is described, and to pour into wind power plant be 100mm～300mm with the section radial dimension of thick and large section casting parts;
Above-mentioned cored-wire all is meant the filamentary material made from thin steel band parcel desired substance powder, and above-mentioned all percentage ratios are mass percent.
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| CN101905313A (en) * | 2010-07-29 | 2010-12-08 | 苏州市海威特铸造厂 | Method for casting main spindle box |
| CN102304602A (en) * | 2011-08-23 | 2012-01-04 | 林州市银桥机械制造有限公司 | Vermicular cast iron produced through short process production, production method and application thereof |
| CN102672117A (en) * | 2012-04-27 | 2012-09-19 | 阳城县绿色铸造研发中心 | Process method for duplex production of HT200 and HT250 castings by blast furnace and intermediate-frequency furnace |
| CN102732676A (en) * | 2012-07-10 | 2012-10-17 | 常州常瑞天力动力机械有限公司 | Shortened-smelting-charging-sequence refining crystal material production process |
| CN103341492B (en) * | 2013-06-25 | 2016-01-20 | 常州凯达重工科技有限公司 | For roll and the production technology thereof of rolling heavy section steel |
| CN103924148A (en) * | 2014-03-18 | 2014-07-16 | 中信重工机械股份有限公司 | A large section and low temperature nodular cast iron and casting method thereof |
| CN104099443B (en) * | 2014-07-14 | 2016-02-24 | 张家港市广大机械锻造有限公司 | CrMo steel waste material dephosphorization protects chromium smelting technology |
| CN104874744A (en) * | 2015-05-20 | 2015-09-02 | 柳州市百田机械有限公司 | Casting method of crank case |
| CN105838979A (en) * | 2016-06-14 | 2016-08-10 | 福建省德赛泵业有限公司 | Ductile iron and manufacturing method thereof |
| CN107119168B (en) * | 2017-06-13 | 2018-11-30 | 磐石华兴汽车零部件制造有限公司 | A kind of method of blast-melted short route casting high-quality casting |
| CN108311704A (en) * | 2018-01-03 | 2018-07-24 | 湖南精量重工科技有限公司 | A kind of precision casting production technology |
| CN109762955A (en) * | 2019-02-26 | 2019-05-17 | 江苏亚峰合金材料有限公司 | A kind of dedicated nodulizer of wind power plant casting |
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