CN103088228A - Production method of high-strength high-conductivity copper alloy stranded wire - Google Patents
Production method of high-strength high-conductivity copper alloy stranded wire Download PDFInfo
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- CN103088228A CN103088228A CN2012103768837A CN201210376883A CN103088228A CN 103088228 A CN103088228 A CN 103088228A CN 2012103768837 A CN2012103768837 A CN 2012103768837A CN 201210376883 A CN201210376883 A CN 201210376883A CN 103088228 A CN103088228 A CN 103088228A
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Abstract
The invention discloses a production method of a high-strength high-conductivity copper alloy stranded wire. According to the composition of the copper alloy stranded wire, copper is used as the main component, 0-0.15 wt% of silver and 0.20-0.72 wt% of chromium are added, and the chromium is added in the form of a copper-chromium interalloy, thereby being beneficial to reducing the burning loss and controlling the composition. A protective gas is charged in the smelting furnace to form a gas protective atmosphere, thereby being beneficial to enhancing the quality of the material. According to the preparation method, a large-section copper alloy is subjected to hot rolling to obtain a rod or processed through an introduction rod. The production method comprises the following steps: carrying out solid solution treatment on the rod, carrying out cold rolling, aging, carrying out cold rolling, carrying out wire drawing, and rewinding to obtain a stranded wire. Within the given composition range, the high-strength high-conductivity copper alloy stranded wire for high-speed railways can be obtained according to the production method. The strength of the produced high-strength high-conductivity copper alloy stranded wire is higher than 570 MPa, and the conductivity is higher than 75%IACS.
Description
Technical field
The present invention relates to a kind of production method of high-intensity high-conductivity copper alloy twisted wire, be applicable to Highspeed Catenary, use as carrier cable and dropper line.
Background technology
High-speed railway is subject to extensively favor and comes from the remarkable advantage of itself: 1) shortened the Passenger Travel time, produced huge social benefit; 2) regional economic development along the line propelling and proportionality action have been played; 3) urban economy development along the line and territorial development have been promoted; 4) number of the enterprise increase along the line makes national tax increase corresponding to land tax; 4) save energy and environmental contamination reduction.
Along with Beijing-Tianjin inter-city railway, military wide high-speed railway, Zheng Xi high-speed railway, Shanghai and Nanjing inter-city high-speed rail, Shanghai-Hangzhou high ferro, Beijing-Shanghai express railway etc. are opened operation in succession, China's high ferro is leading world's high ferro development.Along with the development in epoch, the cry of accelerating development high-speed railway is also more and more higher.
High-speed railway is as the high-tech product that adapts to modern civilization and social progress, be at full speed, large capacity, lowly pollute, safe and reliable famous advanced person's the vehicles.Being widely used of it will reduce the social cost of communications and transportation greatly, thereby produce very large economic results in society.
Enter this century; increasingly serious along with environmental problem; brainstrust is thought; in the communications and transportation every profession and trade; from the energy consumption of unit freight volume, to the taking of environmental resources, to the protection of environmental quality, analysis-by-synthesis is come in the aspects such as the adaptation of physical environment and operation security, the advantage of railway is the most obvious.Therefore each developed country of Europe is after the road that has experienced one section complications, and re-examine and its transportation policy of adjustment are progressively retracted railway to emphasis, and in its strategy, an important ring is the planning and development high-speed railway.People generally believe, the developing china high-speed railway is imperative.High ferro just can become sensible most of China area into one " Chinese village " to China.
So far, the carrier cable of applied to high-speed railway touching net and dropper line use copper-magnesium alloy strand, although its intensity higher (567MPa), specific conductivity very low (being about 64%IACS).It uses as current carrying catenary and dropper line and is unfavorable for that electric current is carried and causes waste of energy, and reduces its work-ing life because of joule heating.That is to say, due to copper-magnesium alloy strand, the current-carrying poor performance, overload capacity is little, and thermal stability is poor, not only causes waste of energy, and has affected its use.Be difficult to satisfy high-speed electric railway to the new demand of carrier cable and dropper line.
Summary of the invention:
The invention provides the production method of the high-speed railway high-intensity high-conductivity copper alloy twisted wire that a kind of current-carrying performance is good, overload capacity is strong, thermal stability is good.
The technical solution used in the present invention is:
a kind of production method of high-intensity high-conductivity copper alloy twisted wire, described method is: take copper as matrix, wherein contain the silver of quality percentage mark 0 ~ 0.15% and 0.20 ~ 0.72% chromium hot-rolled rods or on to draw bar be raw material, with hot-rolled rods or on draw bar and carry out solution treatment, solid solution temperature is 948 ~ 965 ° of C, the solution treatment time is 80 ~ 90min, then carry out deflection and be 30 ~ 50% cold-rolling treatment, carry out again ageing treatment, aging temperature is 465 ~ 487 ℃, the ageing treatment time is 100 ~ 120min, carry out again the cold rolling pole base that obtains diameter 6 ~ 7mm of deflection 40%, then through 3 roads or 4 road wire drawings obtain the monofilament of diameter 2 ~ 3mm, again through after-combustion, obtain the high-intensity high-conductivity copper alloy twisted wire of twisted wire 1 * (7 ~ 19).
Described hot-rolled rods be by take copper as matrix, the diameter that obtains through hot rolling of the copper alloy that wherein contains the silver of quality percentage mark 0 ~ 0.15% and 0.20 ~ 0.72% chromium is the hot-rolled rods of 12mm.Chromium wherein adds in copper chromium master alloy mode.Chromium adds in copper chromium master alloy mode and is conducive to reduce scaling loss and control composition
Concrete, described hot-rolled rods makes by the following method: add cathode copper to make it to be incubated 1 hour after all fusings in smelting furnace, temperature is raised to 1200 ~ 1350 degree (preferred 1290 ℃), add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, add silver according to the content of silver in the copper matrix, be incubated again 30 minutes, flow in the foundry furnace that temperature is 1200 ~ 1300 degree after the refining slagging-off, carry out the semicontinuous casting of cupraloy by the traction casting equipment, obtain the cupraloy bar of diameter 90mm; The cupraloy bar of the diameter 90mm that obtains is carried out hot rolling, 900 ~ 950 ℃ of start rolling temperatures (preferred 910 ℃), finishing temperature is 500 ~ 550 ℃ (preferred 510 ℃), obtains the hot-rolled rods that diameter is 12mm; Take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with inert protective gas in smelting furnace; The furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with inert protective gas in foundry furnace.
Draw bar on described and be by take copper as matrix, wherein contain the silver of quality percentage mark 0 ~ 0.15% and the copper alloy of 0.20 ~ 0.72% chromium draws bar through the diameter that up-drawing method obtains on 12mm.Chromium wherein adds in copper chromium master alloy mode.
concrete, drawing bar on described makes by the following method: add cathode copper to make it to be incubated 1 hour after all fusings in smelting furnace, temperature is raised to 1200 ~ 1350 degree, add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, add silver according to the content of silver in the copper matrix, be incubated again 30 ~ 50 minutes, flow in the foundry furnace that temperature is 1200 ~ 1300 degree after the refining slagging-off, carry out the up casting of cupraloy by the traction casting equipment, lead speed remains on 400 ~ 450mm/min, obtain drawing pole stock on the cupraloy of diameter 12mm, and carry out wrap-up one-tenth dish, take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with inert protective gas in smelting furnace, the furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with inert protective gas in foundry furnace.
Described inert protective gas can be nitrogen or argon gas usually.
Hot-rolled rods of the present invention or on draw in bar, the quality percentage mark that contains silver is 0 ~ 0.15%, wherein 0 refer to be infinitely close to 0 and be not 0, the quality percentage mark that preferably contains silver is 0.08 ~ 0.11%.Hot-rolled rods of the present invention or on draw in bar, the quality percentage mark that contains chromium is preferably 0.32 ~ 0.72%, adds in copper chromium master alloy mode.
Silver, the chromium element that adds certain content in copper alloy of the present invention, produce with production technique provided by the invention, the tensile strength of resulting high-intensity high-conductivity copper alloy twisted wire can be more than 570MPa, specific conductivity is more than 75%IACS, be applicable to Highspeed Catenary, use as carrier cable and dropper line.
Embodiment:
The present invention will be further described with specific embodiment for the below, but protection scope of the present invention is not limited to this.
In the embodiment of the present invention, the production technique of hot-rolled rods is:
Add cathode copper to make it to be incubated 1 hour after all fusings in smelting furnace, temperature is raised to 129 degree, be 0.32% to add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, be 0.09% to add silver according to the content of silver in the copper matrix, be incubated again 30 minutes, flow into after the refining slagging-off in the foundry furnace that temperature is 1240 degree, carry out the semicontinuous casting of cupraloy by the traction casting equipment, obtain the cupraloy bar of diameter 90mm; The cupraloy bar of the diameter 90mm that obtains through 15 passage hot rollings, is obtained Φ 12mm hot-rolled rods, 910 ℃ of start rolling temperatures, finishing temperature is 510 ℃; Take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with nitrogen in smelting furnace; The furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with nitrogen in foundry furnace.
Change the content of silver, chromium in the copper matrix, but preparation process condition is constant, makes respectively Φ 12mm hot-rolled rods, the argentiferous 0.10% of Φ 12mm hot-rolled rods, argentiferous 0.10%, the chromium 0.61% of Φ 12mm hot-rolled rods, argentiferous 0.10%, the chromium 0.52% of argentiferous 0.09%, chromium 0.72%, the Φ 12mm hot-rolled rods of chromium 0.63%.
On draw bar preparation technology be:
add cathode copper to make it to be incubated 1 hour after all fusings in smelting furnace, temperature is raised to 1300 ℃, be 0.34% to add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, be 0.08% to add silver according to the content of silver in the copper matrix, be incubated again 50 minutes, flow in the foundry furnace that temperature is 1200 ~ 1300 degree after the refining slagging-off, carry out the up casting of cupraloy by the traction casting equipment, lead speed remains on 400mm/min, obtain drawing pole stock on the cupraloy of diameter 12mm, and carry out wrap-up one-tenth dish, take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with nitrogen in smelting furnace, the furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with nitrogen in foundry furnace.
Change the content of silver, chromium in the copper matrix, but preparation process condition is constant, makes respectively on the Φ 12mm that draws bar, argentiferous 0.09%, chromium 0.48% on the Φ 12mm that draws bar, argentiferous 0.08%, chromium 0.61% on the Φ 12mm that draws bar, argentiferous 0.11%, chromium 0.54% on the Φ 12mm of argentiferous 0.09%, chromium 0.66% to draw bar.
Embodiment 1
Take copper as matrix, the Φ 12mm hot-rolled rods of argentiferous 0.09%, chromium 0.32% is carried out solution treatment, and the solution treatment standard is 960 ° of C * 90min.Cold rolling reduction is 30 ~ 50%, then carries out ageing treatment, and the standard of ageing treatment is 470 ° of C * 120min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.1 through 4 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 19, tensile strength is 581MPa, and specific conductivity is at 75.5%IACS.
Embodiment 2
Take copper as matrix, the Φ 12mm hot-rolled rods of argentiferous 0.09%, chromium 0.72% is carried out solution treatment, and the solution treatment standard is 954 ° of C * 80min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 475 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 3.0 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 585MPa, and specific conductivity is at 75.3%IACS.
Embodiment 3
Take copper as matrix, the Φ 12mm hot-rolled rods of argentiferous 0.10%, chromium 0.52% is carried out solution treatment, and the solution treatment standard is 961 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 465 ° of C * 120min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.5 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 581MPa, and specific conductivity is at 75.6%IACS.
Embodiment 4
Take copper as matrix, the Φ 12mm hot-rolled rods of argentiferous 0.10%, chromium 0.61% is carried out solution treatment, and the solution treatment standard is 952 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 485 ° of C * 120min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.8 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 19, tensile strength is 578MPa, and specific conductivity is at 75.4%IACS.
Embodiment 5
Take copper as matrix, the Φ 12mm hot-rolled rods of argentiferous 0.10%, chromium 0.63% is carried out solution treatment, and the solution treatment standard is 965 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 485 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 3.0 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 582MPa, and specific conductivity is at 75.7%IACS.
Embodiment 6
Take copper as matrix, to draw bar on the Φ 12mm of argentiferous 0.08%, chromium 0.34% and carry out solution treatment, the solution treatment standard is 952 ° of C * 90min.Cold rolling reduction is 30 ~ 50%, then carries out ageing treatment, and the standard of ageing treatment is 470 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.1 through 4 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 19, tensile strength is 578MPa, and specific conductivity is at 75.4%IACS.
Embodiment 7
Take copper as matrix, to draw bar on the Φ 12mm of argentiferous 0.09%, chromium 0.66% and carry out solution treatment, the solution treatment standard is 956 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 472 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 3.0 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 581MPa, and specific conductivity is at 75.5%IACS.
Embodiment 8
Take copper as matrix, to draw bar on the Φ 12mm of argentiferous 0.11%, chromium 0.54% and carry out solution treatment, the solution treatment standard is 963 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 465 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.5 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 583MPa, and specific conductivity is at 75.1%IACS.
Embodiment 9
Take copper as matrix, to draw bar on the Φ 12mm of argentiferous 0.08%, chromium 0.61% and carry out solution treatment, the solution treatment standard is 951 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 487 ° of C * 100min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 2.8 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 19, tensile strength is 579MPa, and specific conductivity is at 75.3%IACS.
Embodiment 10
Take copper as matrix, to draw bar on the Φ 12mm of argentiferous 0.09%, chromium 0.48% and carry out solution treatment, the solution treatment standard is 948 ° of C * 90min.Cold rolling reduction is 30 ~ 45%, then carries out ageing treatment, and the standard of ageing treatment is 480 ° of C * 110min.Carry out the cold rolling pole base that obtains Φ 6 ~ 7mm of deflection 40% again, then obtain the monofilament of Φ 3.0 through 3 road wire drawings, then through after-combustion, obtain the twisted wire of twisted wire 1 * 7, tensile strength is 575MPa, and specific conductivity is at 75.3%IACS.
Claims (7)
1. the production method of a high-intensity high-conductivity copper alloy twisted wire, it is characterized in that described method is: take copper as matrix, wherein contain the silver of quality percentage mark 0 ~ 0.15% and 0.20 ~ 0.72% chromium hot-rolled rods or on to draw bar be raw material, with hot-rolled rods or on draw bar and carry out solution treatment, solid solution temperature is 948 ~ 965 ° of C, the solution treatment time is 80 ~ 90min, then carry out deflection and be 30 ~ 50% cold-rolling treatment, carry out again ageing treatment, aging temperature is 465 ~ 487 ℃, the ageing treatment time is 100 ~ 120min, carry out again the cold rolling pole base that obtains diameter 6 ~ 7mm of deflection 40%, then through 3 roads or 4 road wire drawings obtain the monofilament of diameter 2 ~ 3mm, again through after-combustion, obtain the high-intensity high-conductivity copper alloy twisted wire of twisted wire 1 * (7 ~ 19).
2. the method for claim 1, is characterized in that described hot-rolled rods is that diameter is the hot-rolled rods of 12mm.
3. method as claimed in claim 2, it is characterized in that described hot-rolled rods makes by the following method: add cathode copper to make it to be incubated 1 hour after all fusings in smelting furnace, temperature is raised to 1200 ~ 1350 degree, add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, add silver according to the content of silver in the copper matrix, be incubated again 30 minutes, flow in the foundry furnace that temperature is 1200 ~ 1300 degree after the refining slagging-off, carry out the semicontinuous casting of cupraloy by the traction casting equipment, obtain the cupraloy bar of diameter 90mm, the cupraloy bar of the diameter 90mm that obtains is carried out hot rolling, 900 ~ 950 ℃ of start rolling temperatures, finishing temperature is 500 ~ 550 ℃, obtains the hot-rolled rods that diameter is 12mm, take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with inert protective gas in smelting furnace, the furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with inert protective gas in foundry furnace.
4. the method for claim 1, it is characterized in that drawing on described bar and be diameter and be 12mm on draw bar.
5. method as claimed in claim 4, it is characterized in that drawing bar on described makes by the following method: add cathode copper to make it after all fusings insulation 1 hour in smelting furnace, temperature is raised to 1200 ~ 1350 degree, add copper chromium master alloy according to the content of chromium in the copper matrix, after it all dissolves, kept 30 minutes, add silver according to the content of silver in the copper matrix, be incubated again 30 ~ 50 minutes, flow in the foundry furnace that temperature is 1200 ~ 1300 degree after the refining slagging-off, carry out the up casting of cupraloy by the traction casting equipment, lead speed remains on 400 ~ 450mm/min, obtain drawing pole stock on the cupraloy of diameter 12mm, and carry out wrap-up one-tenth dish, take the sodium aluminum fluoride of oven dry and charcoal as insulating covering agent, and cover tightly the sealing lid of smelting furnace in fusion process in described smelting furnace, be filled with inert protective gas in smelting furnace, the furnace bottom of described foundry furnace is spread oven dry flake graphite insulating covering agent, and covers tightly the foundry furnace sealing lid in castingprocesses, is filled with inert protective gas in foundry furnace.
6. the method for claim 1, it is characterized in that described hot-rolled rods or on draw in bar, the quality percentage mark that contains silver is 0.08 ~ 0.11%.
7. the method for claim 1, it is characterized in that described hot-rolled rods or on draw in bar, the quality percentage mark that contains chromium is 0.32 ~ 0.72%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357707A (en) * | 2014-11-26 | 2015-02-18 | 农彩丽 | Novel copper alloy and preparation method thereof |
| CN104611592A (en) * | 2014-12-25 | 2015-05-13 | 芜湖市民泰铜业有限责任公司 | Smelting method of copper and iron intermediate alloy |
| CN105499302A (en) * | 2016-01-11 | 2016-04-20 | 赣州江钨拉法格高铁铜材有限公司 | Production method of pure copper stranded wire |
| CN107904432A (en) * | 2017-11-07 | 2018-04-13 | 江西理工大学 | A kind of method of stability contorting continuously casting copper chromium titanium-zirconium alloy bar component under atmospheric environment |
| CN108160963A (en) * | 2017-12-29 | 2018-06-15 | 安徽楚江高新电材有限公司 | The production method of contact nets in electrified railways carrier cable high-strength copper bar |
| CN108465787A (en) * | 2018-03-02 | 2018-08-31 | 陕西斯瑞新材料股份有限公司 | A kind of manufacturing process of asynchronous traction motor rotor chromium-bronze conducting bar |
| CN114507830A (en) * | 2022-01-20 | 2022-05-17 | 浙江力博实业股份有限公司 | Manufacturing method of high-strength high-conductivity copper-chromium-silver alloy |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357707A (en) * | 2014-11-26 | 2015-02-18 | 农彩丽 | Novel copper alloy and preparation method thereof |
| CN104611592A (en) * | 2014-12-25 | 2015-05-13 | 芜湖市民泰铜业有限责任公司 | Smelting method of copper and iron intermediate alloy |
| CN105499302A (en) * | 2016-01-11 | 2016-04-20 | 赣州江钨拉法格高铁铜材有限公司 | Production method of pure copper stranded wire |
| CN107904432A (en) * | 2017-11-07 | 2018-04-13 | 江西理工大学 | A kind of method of stability contorting continuously casting copper chromium titanium-zirconium alloy bar component under atmospheric environment |
| CN108160963A (en) * | 2017-12-29 | 2018-06-15 | 安徽楚江高新电材有限公司 | The production method of contact nets in electrified railways carrier cable high-strength copper bar |
| CN108160963B (en) * | 2017-12-29 | 2020-06-23 | 安徽楚江高新电材有限公司 | Production method of high-strength copper rod for catenary of contact network of electrified railway |
| CN108465787A (en) * | 2018-03-02 | 2018-08-31 | 陕西斯瑞新材料股份有限公司 | A kind of manufacturing process of asynchronous traction motor rotor chromium-bronze conducting bar |
| CN108465787B (en) * | 2018-03-02 | 2020-05-12 | 陕西斯瑞新材料股份有限公司 | Manufacturing process of chromium bronze conducting bar of asynchronous traction motor rotor |
| CN114507830A (en) * | 2022-01-20 | 2022-05-17 | 浙江力博实业股份有限公司 | Manufacturing method of high-strength high-conductivity copper-chromium-silver alloy |
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Application publication date: 20130508 |