CN104357732B - One utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting - Google Patents
One utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting Download PDFInfo
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Abstract
The present invention provides one to utilize the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting, belongs to rustless steel field.Follow the steps below: (1) returns the purified treatment of material, (2) fusing returns and expects to use the semicontinuous vacuum induction melting furnace of 500kg to carry out melting, being encased in crucible by 2～3 batches, return material point, carry out melting under vacuo, power transmission vacuum is not more than 0.67Pa；(3) add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred；(4) argon filling is added element and pours into a mould finished product alloy pig: use 100% return material vacuum melting technique scheme to produce ZG0Cr17Ni4Cu3Nb revert alloy, the program achieves precious metal element Cr, the reusing of Ni, Nb, reduce the production cost of foundry goods, produce alloy per ton and save expense about 40,000 yuan, producing ZG0Cr17Ni4Cu3Nb revert alloy 5 tons calculating per year, year, wound benefit was up to 200,000 yuan.
Description
Technical field
The present invention relates to rustless steel field, utilize ZG0Cr17Ni4Cu3Nb revert melting and casting not particularly to one
The method of rust steel.
Background technology
ZG0Cr17Ni4Cu3Nb is a kind of precipitation-hardening cast stainless steel, and it has, and intensity is high, plasticity is good, casting character is excellent
Good, there is good corrosion resistance, be widely used in manufacture at 320 DEG C of corrosion-resistant, wear-resisting gas turbine structures claimed below
Part.General produce ZG0Cr17Ni4Cu3Nb alloy pig method be with virgin material or return material use electric arc furnace load method melting or
Pouring into a mould alloy pig after intermediate frequency furnace melting, the alloy pig gas content in antivacuum lower production is close even beyond technology in this way
Requiring the upper limit, impurity content easily exceeds standard, it is difficult to meet the use requirement of gas turbine parts.Use vacuum induction melting
ZG0Cr17Ni4Cu3Nb alloy pig, can significantly reduce the gas in alloy and impurity content, chemical composition stability, mechanicalness
Can be beyond the 15% of prescription, it is sufficient to ensure the use requirement of part.
Due to ZG0Cr17Ni4Cu3Nb alloy large usage quantity in the production process of gas turbine precision castings, production creates
Substantial amounts of running channel, rising head and waste casting.In the production of foundry goods, the utilization rate of alloy is about 35%.Produce at present is a large amount of
Running channel, rising head and waste casting etc. return material and are the most effectively recycled, and cause the waste of metal material, destroy raw
State environment.
Summary of the invention
For the problems referred to above, one of the present invention utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting,
By with 100% ZG0Cr17Ni4Cu3Nb return material Utilization plan, with vaccum sensitive stove use fine vacuum high temperature refinery+
Under Si-Ba-Ca alloy deoxidation+vacuum, slagging-off+inert gas shielding alloying technology technology is produced and is met the conjunction that product use requires
Ingot, improves stock utilization, reduces the wasting of resources.Cr, Ni, Nb in alloy broadly falls into precious metal element,
Ensure that alloy expects Appropriate application to returning on the premise of using safety, production cost can be significantly reduced.For manufacturing gas turbine
Casting quality requires high and does not allow foundry goods to there is any defect, and therefore the metallurgical quality to alloy requires high, to composition and impurity
Content controls strict.
One of the present invention utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting, according to following step
Suddenly carry out:
(1) purified treatment of material is returned
Running channel, rising head and the waste casting produced in foundry production etc. is returned material barreling (5～6) hour, then to return
Material surface carries out blast, remove the corrosion on surface, formwork, be mingled with, burning into sand etc., by compressed air, returns is expected that surface block-by-block blows
Only, the foreign material of surface adhesion are removed；
(2) fusing returns material
Use the semicontinuous vacuum induction melting furnace of 500kg to carry out melting, 2～3 batches, return material point is encased in crucible, very
Carrying out melting under sky, power transmission vacuum is not more than 0.67Pa；
(3) add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred
The refining temperature of alloy controls in (1600～1620) DEG C；Refining time controls at (25～35) min, refining period vacuum
Degree is not more than 1.33Pa, adds the Si-Ca-Ba double deoxidizer accounting for alloy mass percentage composition 0.1% before alloy refine, completes to close
After gold refining, under vacuo alloy bath surface is carried out slagging-off operation；
(4) argon filling is added element and pours into a mould finished product alloy pig
Cooling time is more than 30min in high vacuum conditions, gets rid of the impurity in alloy；Freezing is filled with argon to melting after terminating
Room vacuum gauge pressure value is 0.075MPa～0.06MPa, then power transmission rushes film；Supplement the Mn and 0.15～0.2% adding 0.3%
Cu；After fusing under conditions of (1530～1550) DEG C, power transmission power (140～150) kW, refine (5～8)
Min, then pours into a mould, and becomes final alloy ingot.
Described Si-Ca-Ba double deoxidizer is: calsibar alloy, the most by mass percentage containing Si:55%～60%, Ca:
15%～20%, Ba:14%～18%.
Described return material refers to running channel, rising head and waste casting.
The chemical composition of described ZG0Cr17Ni4Cu3Nb is by mass percentage: C≤0.06, Cr (15.50-16.70),
Si(0.50-1.00)、Ni(3.80-4.60)、Cu(2.90-3.50)、Nb(0.20-0.40)、Al≤0.050、Ta≤0.050、
Sn≤0.020, N≤0.050, Mn≤0.70, S≤0.030, P≤0.040, for surplus Fe
Described step (2) fusing returns material particularly as follows: use the semicontinuous vacuum induction melting furnace of 500kg to carry out melting；By
A collection of return material installs in crucible, when vacuum reaches no more than 0.67Pa, starts power transmission fusing, first with (120～140)
KW power is to returning material heating (20～30) min, then with 200kW power to returning material heating (30～45) min, waits to expect
After surface becomes kermesinus, with 240～300kW power power transmissions, until material fine melt；Under vacuo second batch is returned material from adding
Material room adds in crucible, then by 240～300kW power power transmissions, until material fine melt；Return material by the 3rd batch to add from feed compartment
Enter in crucible, then by 240～300kW power power transmissions, until material fine melt；Every stove molten steel amount 480～500kg.
Described step (3) adds slagging-off under deoxidizer, fine vacuum high temperature refinery, vacuum, particularly as follows: after the most load melting,
Continue power transmission 15～20min, measure alloy melt temperature with contact thermocouple, when melt temperature reaches (1600～1620) DEG C
Time, add the Si-Ca-Ba double deoxidizer of 0.1%；Keeping working chamber's vacuum to be not more than 1.33Pa, power transmission power controls
(120～130) kW, makes alloy melt keep (25～35) min under this condition, utilizes high temperature and high vacuum condition,
Alloy is carried out refine, utilizes electromagnetic agitation to enable the impurity element of low melting point in revert alloy and low-density field trash to fill
Divide and float, carry out overturning crucible every 7min and operate 2 times, part field trash is adhered on sidewall of crucible, makes molten steel obtain only
Change, the oxygen in removing alloy, sulfur, nitrogen；After completing alloy refine, under the conditions of vacuum is not more than 1.33Pa, alloy is melted
The surface of body carries out slagging-off operation, after collecting the scum silica frost on surface, is promoted by deslagging device, closes push-pull valve and discharged out of the furnace by slag.
Described step (4) argon filling add element and pour into a mould finished product alloy pig particularly as follows: in high vacuum conditions alloy melt freezing
Time is more than 30min, makes molten steel face conjunctiva, gets rid of the gas in alloy further；Freezing is filled with argon to working chamber after terminating
Vacuum gauge pressure value is 0.075MPa～0.06MPa, then power transmission rushes film；Add the Cu of the Mn and 0.15%～0.2% of 0.3%,
After fusing under conditions of (1530～1550) DEG C, power transmission power (140～150) kW, refine (5～8) min, then will
Molten steel is poured in ingot mould.
The chemical composition of revert alloy of the present invention (with PDA-55002 type direct-reading spectrometer, TC-436 type gas analyser and
HCS-040G high frequency infrared ray carbon sulphur analyser is analyzed), mechanical performance all reach the level of virgin material alloy；N content in alloy is low
In 0.0065%, S content is less than 0.0045%；After (1150 ± 10) DEG C homogenization+(540 ± 5) DEG C Ageing Treatment, alloy
σ0.2More than 1030MPa, ψ higher than 45% (measuring with WDW-300 universal testing machine).
Using 100% return material vacuum melting technique scheme to produce ZG0Cr17Ni4Cu3Nb revert alloy, the program is real
Show precious metal element Cr, the reusing of Ni, Nb, reduced the production cost of foundry goods, produced alloy per ton and save expense
About 40,000 yuan, producing ZG0Cr17Ni4Cu3Nb revert alloy 5 tons calculating per year, year, wound benefit was up to 200,000 yuan.
Detailed description of the invention
Below by embodiment, the present invention is further explained.
Spectrogrph is PDA-55002 type direct-reading spectrometer.
Analyser is TC-436 type gas analyser and HCS-040G high frequency infrared ray carbon sulphur analyser.
Material properties test uses WDW-300 universal testing machine.
Embodiment 1
1) purified treatment of material, is returned
Running channel, rising head and the waste casting produced in foundry production etc. is returned material and first carries out barreling in 5 hours process, remove
The nitrogen-enriched layer of material surface, carries out blast to returning to material surface afterwards, removes the bur returned in material edge spike and remaining
Shells etc., reach any surface finish, then are blown off by return material surface block-by-block by compressed air, remove the foreign material of surface adhesion, through dividing
After picking, for revert alloy melting raw material.
2), fusing returns material
The semicontinuous vacuum induction melting furnace of 500kg is used to carry out melting.First return material is installed in crucible, when vacuum reaches
During to no more than 0.67Pa, start power transmission fusing, first with 120kW power to returning material heating 30min, then use 200kW merit
Rate is to returning material heating 30min, after material surface becomes kermesinus, with higher than 240kW power power transmission, until material fine melt.
Under vacuo second batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；
3rd batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；Every stove steel
The water yield 480～500kg.
3), add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred
After the most load melting, continue power transmission 15min, measure alloy melt temperature with contact thermocouple, when melt temperature reaches
During to 1620 DEG C, add the Si-Ca-Ba double deoxidizer of 0.1%.Working chamber's vacuum is kept to be not more than 1.33Pa, power transmission power
Control at 120kW, make alloy melt keep 35min under this condition, utilize high temperature and high vacuum condition, alloy is carried out
Refine, utilizes electromagnetic agitation to enable the impurity element of low melting point in revert alloy and low-density field trash fully to float, often
Carrying out overturning crucible every 7min to operate 2 times, adhere on sidewall of crucible by part field trash, make molten steel be purified, removing is closed
Oxygen in gold, sulfur, nitrogen；After completing alloy refine, under the conditions of vacuum no more than 1.33Pa, the surface of alloy melt is entered
Row slagging-off operation, after collecting the scum silica frost on surface, promotes deslagging device, closes push-pull valve and discharged out of the furnace by slag.
4), argon filling is added element and pours into a mould finished product alloy pig
Alloy melt cooling time is more than 30min in high vacuum conditions, makes molten steel face conjunctiva, gets rid of the gas in alloy further
Body；Freezing is filled with argon to working chamber's vacuum gauge pressure value after terminating be 0.06MPa, then power transmission rushes film；Add the Mn of 0.3%
With 0.15%～0.2% Cu, after fusing 1530 DEG C, under conditions of power transmission power 150kW, refine 8min, then by steel
Liquid is poured in ingot mould.
Use PDA-55002 type direct-reading spectrometer, TC-436 type gas analyser and HCS-040G high frequency-infrared analysis of carbon and sulfur
Instrument is analyzed the chemical composition of revert alloy, mechanical performance and is all reached the level of virgin material alloy；N content in alloy is:
0.0058%, S content is 0.0041%；After (1150 ± 10) DEG C homogenization+(540 ± 5) DEG C Ageing Treatment, the σ of alloy0.2
It is 49% for 1040MPa, ψ.
Embodiment 2
1) purified treatment of material, is returned
Running channel, rising head and the waste casting produced in foundry production etc. is returned material and first carries out barreling in 5.5 hours process, go
Except the nitrogen-enriched layer of material surface, expect that surface carries out blast to returning afterwards, remove the bur and remaining returned in material edge spike
Shell etc., reach any surface finish, then by compressed air, return material surface block-by-block blown off, remove the foreign material of surface adhesion, warp
After sorting, for revert alloy melting raw material.
2), fusing returns material
The semicontinuous vacuum induction melting furnace of 500kg is used to carry out melting.First return material is installed in crucible, when vacuum reaches
During to no more than 0.67Pa, start power transmission fusing, first with 140kW power to returning material heating 20min, then use 200kW merit
Rate is to returning material heating 30min, after material surface becomes kermesinus, with higher than 240kW power power transmission, until material fine melt.
Under vacuo second batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；
3rd batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；Every stove steel
The water yield 480～500kg.
3), add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred
After the most load melting, continue power transmission 20min, measure alloy melt temperature with contact thermocouple, when melt temperature reaches
During to 1600 DEG C, add the Si-Ca-Ba double deoxidizer of 0.1%.Working chamber's vacuum is kept to be not more than 1.33Pa, power transmission power
Control at 130kW, make alloy melt keep 25min under this condition, utilize high temperature and high vacuum condition, alloy is carried out
Refine, utilizes electromagnetic agitation to enable the impurity element of low melting point in revert alloy and low-density field trash fully to float, often
Carrying out overturning crucible every 7min to operate 2 times, adhere on sidewall of crucible by part field trash, make molten steel be purified, removing is closed
Oxygen in gold, sulfur, nitrogen；After completing alloy refine, under the conditions of vacuum no more than 1.33Pa, the surface of alloy melt is entered
Row slagging-off operation, after collecting the scum silica frost on surface, promotes deslagging device, closes push-pull valve and discharged out of the furnace by slag.
4), argon filling is added element and pours into a mould finished product alloy pig
Alloy melt cooling time is more than 30min in high vacuum conditions, makes molten steel face conjunctiva, gets rid of the gas in alloy further
Body；Freezing is filled with argon to working chamber's vacuum gauge pressure value after terminating be 0.07MPa, then power transmission rushes film；Add the Mn of 0.3%
With 0.15%～0.2% Cu, after fusing 1540 DEG C, under conditions of power transmission power 145kW, refine 7min, then by steel
Liquid is poured in ingot mould.
Use with PDA-55002 type direct-reading spectrometer, TC-436 type gas analyser and HCS-040G high frequency-infrared carbon sulphur content
Analyzer is analyzed the chemical composition of revert alloy, mechanical performance and is all reached the level of virgin material alloy；N content in alloy is:
0.0063%, S content is 0.0042%；After (1150 ± 10) DEG C homogenization+(540 ± 5) DEG C Ageing Treatment, the σ of alloy0.2
It is 48% for 1045MPa, ψ.
Embodiment 3
1) purified treatment of material, is returned
Running channel, rising head and the waste casting produced in foundry production etc. is returned material and first carries out barreling in 6 hours process, remove
The nitrogen-enriched layer of material surface, carries out blast to returning to material surface afterwards, removes the bur returned in material edge spike and remaining
Shells etc., reach any surface finish, then are blown off by return material surface block-by-block by compressed air, remove the foreign material of surface adhesion, through dividing
After picking, for revert alloy melting raw material.
2), fusing returns material
The semicontinuous vacuum induction melting furnace of 500kg is used to carry out melting.First return material is installed in crucible, when vacuum reaches
During to no more than 0.67Pa, start power transmission fusing, first with 130kW power to returning material heating 25min, then use 200kW merit
Rate is to returning material heating 40min, after material surface becomes kermesinus, with higher than 240kW power power transmission, until material fine melt.
Under vacuo second batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；
3rd batch is returned material and adds crucible from feed compartment, then with higher than 240kW power power transmission, until expecting fine melt；Every stove steel
The water yield 480～500kg.
3), add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred
After the most load melting, continue power transmission 18min, measure alloy melt temperature with contact thermocouple, when melt temperature reaches
During to 1610 DEG C, add the Si-Ca-Ba double deoxidizer of 0.1%.Working chamber's vacuum is kept to be not more than 1.33Pa, power transmission power
Control at 125kW, make alloy melt keep 30min under this condition, utilize high temperature and high vacuum condition, alloy is carried out
Refine, utilizes electromagnetic agitation to enable the impurity element of low melting point in revert alloy and low-density field trash fully to float, often
Carrying out overturning crucible every 7min to operate 2 times, adhere on sidewall of crucible by part field trash, make molten steel be purified, removing is closed
Oxygen in gold, sulfur, nitrogen；After completing alloy refine, under the conditions of vacuum no more than 1.33Pa, the surface of alloy melt is entered
Row slagging-off operation, after collecting the scum silica frost on surface, promotes deslagging device, closes push-pull valve and discharged out of the furnace by slag.
4), argon filling is added element and pours into a mould finished product alloy pig
Alloy melt cooling time is more than 30min in high vacuum conditions, makes molten steel face conjunctiva, gets rid of the gas in alloy further
Body；Freezing is filled with argon to working chamber's vacuum gauge pressure value after terminating be 0.075MPa, then power transmission rushes film；Add 0.3%
The Cu of Mn and 0.15%～0.2%, after fusing 1550 DEG C, under conditions of power transmission power 140kW, refine 6min, then
Molten steel is poured in ingot mould.
Use PDA-55002 type direct-reading spectrometer, TC-436 type gas analyser and HCS-040G high frequency-infrared analysis of carbon and sulfur
Instrument is analyzed the chemical composition of revert alloy, mechanical performance and is all reached the level of virgin material alloy；N content in alloy is:
0.0055%, S content is 0.0038%；After (1150 ± 10) DEG C homogenization+(540 ± 5) DEG C Ageing Treatment, the σ of alloy0.2
It is 46% for 1050MPa, ψ.
Claims (4)
1. one kind utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting, it is characterised in that according to following step
Suddenly carry out:
(1) purified treatment of material is returned
The running channel produced in foundry production, rising head and waste casting are returned material barreling (5～6) hour, then to returning material table
Face carries out blast, remove the corrosion on surface, formwork, be mingled with, burning into sand, by compressed air, return material surface block-by-block is blown off, clearly
Foreign material except surface adhesion；
(2) fusing returns material
Use the semicontinuous vacuum induction melting furnace of 500kg to carry out melting, 2～3 batches, return material point is encased in crucible, in vacuum
Under carry out melting, power transmission vacuum is not more than 0.67Pa；
(3) add under deoxidizer, fine vacuum high temperature refinery, vacuum and remove the gred
The refining temperature of alloy controls in (1600～1620) DEG C；Refining time controls at (25～35) min, refining period vacuum
Degree is not more than 1.33Pa, adds the Si-Ca-Ba double deoxidizer accounting for alloy mass percentage composition 0.1%, complete alloy before alloy refine
After refine, under vacuo alloy bath surface is carried out slagging-off operation；
(4) argon filling is added element and pours into a mould finished product alloy pig
Cooling time is more than 30min in high vacuum conditions, gets rid of the impurity in alloy；Freezing is filled with argon to melting after terminating
Room vacuum gauge pressure value is 0.075MPa～0.06MPa, then power transmission rushes film；Supplement the Mn's and 0.15～0.2% of addition 0.3%
Cu；After fusing under conditions of (1530～1550) DEG C, power transmission power (140～150) kW, refine (5～8) min,
Then pour into a mould, become final alloy ingot；
The chemical composition of described ZG0Cr17Ni4Cu3Nb is by mass percentage: C≤0.06, Cr (15.50-16.70), Si
(0.50-1.00)、Ni(3.80-4.60)、Cu(2.90-3.50)、Nb(0.20-0.40)、Al≤0.050、Ta≤0.050、Sn≤0.020、
N≤0.050, Mn≤0.70, S≤0.030, P≤0.040, for surplus Fe.
One the most according to claim 1 utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting,
It is characterized in that described step (2) fusing returns material particularly as follows: use the semicontinuous vacuum induction melting furnace of 500kg to carry out melting；
First return material is installed in crucible, when vacuum reaches no more than 0.67Pa, starts power transmission fusing, first with (120～140)
KW power is to returning material heating (20～30) min, then with 200kW power to returning material heating (30～45) min, treats material table
After face becomes kermesinus, with 240～300kW power power transmissions, until material fine melt；Under vacuo second batch is returned material from feed compartment
Add in crucible, then by 240～300kW power power transmissions, until material fine melt；Return material by the 3rd batch and add crucible from feed compartment
In, then by 240～300kW power power transmissions, until material fine melt；Every stove molten steel amount 480～500kg.
One the most according to claim 1 utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting,
It is characterized in that described step (3) to add under deoxidizer, fine vacuum high temperature refinery, vacuum to remove the gred, particularly as follows: all furnace charge melts
After change, continue power transmission 15～20min, measure alloy melt temperature with contact thermocouple, when melt temperature reaches (1600～1620)
DEG C time, add 0.1% Si-Ca-Ba double deoxidizer；Keeping working chamber's vacuum to be not more than 1.33Pa, power transmission power controls
(120～130) kW, makes alloy melt keep (25～35) min under this condition, utilizes high temperature and high vacuum condition, right
Alloy carries out refine, utilizes electromagnetic agitation to enable the impurity element of low melting point in revert alloy and low-density field trash abundant
Float, carry out overturning crucible every 7min and operate 2 times, part field trash is adhered on sidewall of crucible, makes molten steel be purified,
Oxygen in removing alloy, sulfur, nitrogen；After completing alloy refine, table to alloy melt under the conditions of vacuum is not more than 1.33Pa
Face carries out slagging-off operation, after collecting the scum silica frost on surface, is promoted by deslagging device, closes push-pull valve and discharged out of the furnace by slag.
One the most according to claim 1 utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting,
It is characterized in that described step (4) argon filling is added element and poured into a mould finished product alloy pig particularly as follows: alloy melt in high vacuum conditions
Cooling time is more than 30min, makes molten steel face conjunctiva, gets rid of the gas in alloy further；Freezing is filled with argon to molten after terminating
Refining room vacuum gauge pressure value is 0.075MPa～0.06MPa, then power transmission rushes film；The Mn's and 0.15%～0.2% of addition 0.3%
Cu, after fusing under conditions of (1530～1550) DEG C, power transmission power (140～150) kW, refine (5～8) min, so
After molten steel is poured in ingot mould.
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| CN201410567527.2A CN104357732B (en) | 2014-10-21 | 2014-10-21 | One utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting |
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| CN201410567527.2A CN104357732B (en) | 2014-10-21 | 2014-10-21 | One utilizes the ZG0Cr17Ni4Cu3Nb stainless method of revert melting and casting |
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| CN104357732B true CN104357732B (en) | 2016-09-28 |
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| CN106048387A (en) * | 2016-07-01 | 2016-10-26 | 宁国市开源电力耐磨材料有限公司 | Melting technology of wear-resisting high-manganese alloy steel |
| CN106244900A (en) * | 2016-08-23 | 2016-12-21 | 宁国市开源电力耐磨材料有限公司 | A kind of vacuum melting technique of high intensity manganese steel |
| CN111850424A (en) * | 2019-04-30 | 2020-10-30 | 大田精密工业股份有限公司 | Golf club head alloy material and golf club head |
| CN116814903B (en) * | 2023-07-13 | 2024-04-19 | 中国科学院金属研究所 | Vacuum induction smelting method for high-purity stainless steel |
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| CN102965535B (en) * | 2012-11-15 | 2014-12-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414 |
| CN103556004B (en) * | 2013-11-11 | 2015-10-21 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of K438 of employing revert prepares the preparation method of K438 alloy |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |
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