CN101381825B - Environment friendly free-cutting bronze alloy processing technique - Google Patents
Environment friendly free-cutting bronze alloy processing technique Download PDFInfo
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- CN101381825B CN101381825B CN2008102307358A CN200810230735A CN101381825B CN 101381825 B CN101381825 B CN 101381825B CN 2008102307358 A CN2008102307358 A CN 2008102307358A CN 200810230735 A CN200810230735 A CN 200810230735A CN 101381825 B CN101381825 B CN 101381825B
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- 229910000906 Bronze Inorganic materials 0.000 title claims abstract description 15
- 238000005520 cutting process Methods 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 22
- 230000008018 melting Effects 0.000 claims abstract description 22
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 229910052718 tin Inorganic materials 0.000 claims abstract description 18
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 239000003610 charcoal Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- 239000000498 cooling water Substances 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 238000001354 calcination Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 4
- 239000010949 copper Substances 0.000 abstract description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 23
- 239000011701 zinc Substances 0.000 abstract description 17
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052759 nickel Inorganic materials 0.000 abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 11
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- -1 stibium Chemical compound 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 10
- 229910000912 Bell metal Inorganic materials 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- RUQACMGBLIBRPP-UHFFFAOYSA-N [Zn][Pb][Sn] Chemical compound [Zn][Pb][Sn] RUQACMGBLIBRPP-UHFFFAOYSA-N 0.000 description 4
- 239000010974 bronze Substances 0.000 description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 4
- JVCDUTIVKYCTFB-UHFFFAOYSA-N [Bi].[Zn].[Sn] Chemical compound [Bi].[Zn].[Sn] JVCDUTIVKYCTFB-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910020994 Sn-Zn Inorganic materials 0.000 description 1
- 229910009069 Sn—Zn Inorganic materials 0.000 description 1
- 229910009071 Sn—Zn—Bi Inorganic materials 0.000 description 1
- JSTMTCUPOJKSMH-UHFFFAOYSA-N [Ni].[Bi].[Zn].[Sn] Chemical compound [Ni].[Bi].[Zn].[Sn] JSTMTCUPOJKSMH-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
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Abstract
The invention relates to a technique for processing bronze alloy which is environment-friendly and easy to cut. The technique comprises the following steps of mixture, melting, refining, analysis, casting, straightening, saw cutting, inspection, package and warehousing. The compositions in weight percentage of the bronze alloy are 2.0 to 10.0 percent of tin, 3.0 to 12.0 percent of zinc, 2.0 to 8.0 percent of bismuth or 2.0 to 8.0 percent of the bismuth and 0.1 to 0.5 percent of nickel (plumbum, stibium, iron, phosphor, sulfur, silicon and aluminum), less than or equal to 0.5 percent of unavoidable impurities, and the balance being copper. The copper or the copper and the nickel are thrown into a smelting furnace hearth for smelting; the tin, the bismuth and the zinc are added into the smelting furnace hearth after melting; the liquid level is covered with calcined charcoal; after complete smelting, the temperature is raised and the refining is performed, wherein the temperature is between 1,100 and 1,250 DEG C and the time is between 10 and 30 minutes; after stirring and sampling, horizontal continuous casting is performed; and a crystallizer is a water-cooling crystallizer which is lined with a high-purity graphite sleeve, wherein the casting temperature is between 1,140 and 1,220 DEG C, the speed is between 15 and 30 meters per hour, and the cooling water pressure is between 0.01 and 0.05 MPa.
Description
Technical field
The invention belongs to the non-ferrous metal technical field, refer more particularly to a kind of environment friendly free-cutting bronze alloy complete processing.
Background technology
Tin zinc lead bronze alloy is owing to have castability, wear resistance, corrosion-resistant and easy machinability well, be mainly used in fields such as mechanical bearing, automobile device, processing wear resistant corrosion resistant part is as bearing shell, axle sleeve, cylinder sleeve, piston clutch coupling, friction plate etc.
In recent years along with the growing continuously and fast of China's economy, particularly the fast development of machine industry makes the steady-state growth year by year of tin zinc lead bronze materials demand amount.But, the lead in the copper alloy play improve the material cutting ability in, but have because contaminate environment, the harmful former thereby problem that will progressively be replaced.Since World Health Organization in 1992 (WTO) stipulate " lead content in the tap water is preferably in below the 0.01mg/L " in guidelines for drinking water quality since, the demand of Lead free cutting copper alloys and research have spread to multiple industries such as machinofacture and have come from building, water supply utensil industry.In recent years, countries in the world constantly have free-cutting copper alloy or environmental protection copper alloy to come out.Wherein, the free-cutting copper alloy that adopts bismuth to substitute plumbous exploitation becomes an important research direction.But bismuth resource-constrained and costing an arm and a leg, and castability, free cutting property, mechanical property that bismuthiferous copper alloy exists can not be taken into account problem simultaneously.
Summary of the invention
For addressing the above problem, the invention provides a kind of environment friendly free-cutting bronze alloy complete processing, this complete processing is to add Bi to constitute the bell metal of Cu-Sn-Zn-Bi or add the bell metal that nickel element constitutes Cu-Sn-Zn-Bi-Ni again in the Cu-Sn-Zn element; Because Pb is as the unavoidable impurities element, so content is extremely low in alloy, constitutes impurity content jointly with other inevitable Sb, Fe, P, S, Si, Al; This processing process is short, and production cost is low.
In order to realize the foregoing invention purpose, the present invention has adopted following technical scheme:
Described environment friendly free-cutting bronze alloy complete processing comprises batching, melting, refining, analysis, casting, aligning, sawing, inspection, packing warehouse-in, and wherein batching, melting, refining, analysis, casting processing technology division are as follows:
I, batching
Get Sn2.0～10.0 by weight percentage, Zn3.0～12.0, Bi2.0～8.0 or Bi2.0～8.0+Ni0.1～0.5, inevitable impurity Pb+Sb+Fe+P+S+Si+Al sum≤0.5%, the Cu surplus is prepared burden;
II, melting
Earlier Cu or Cu+Ni input smelting furnace are carried out melting, treat to add Sn, Bi, Zn again after Cu or Cu+Ni dissolve, liquid level covers and adopts the calcining charcoal to make insulating covering agent;
III, refining
Treat that raw material all melts the back intensification and carries out refining, 1100～1250 ℃ of refining temperatures, refining time 10～30 minutes;
IV, analysis
The stirring sampling is done the Chemical Composition analysis and is seen whether meet batching proportion;
V, casting
Carry out horizontal continuous-casting after sampling analysis is qualified, crystallizer adopts water mold liner high purity graphite cover, and 1140～1220 ℃ of casting temps were stopped cooling water pressure 0.01～0.05MPa 1～5 second in drop-down 1～5 second 15～30 meters/hour of casting speeds.
Owing to adopted technical scheme as mentioned above, the present invention has following superiority:
1, the present invention has castability preferably, be difficult for to adopt hot-work (hot rolling, extruding, forging are easy to crack), and so subsequent technique can adopt: horizontal casting-aligning-scale sawing-inspection-packing is put in storage etc.
2, the tin zinc bismuth bronze of processing and fabricating of the present invention or tin zinc bismuth nickel bronze alloy material, belong to environment-friendly copper alloy, technology is simple, quality is good, alloy mechanical property: tensile strength Rm 〉=240MPa, regulation disproportional extension strength Rp0.2 〉=120MPa, elongation A 〉=15%, hardness HB 〉=50, cutting ability: being equal to or slightly lower than the cutting ability of tin zinc lead bronze, is good tin zinc lead bronze alloy replacing product.
3, processing process of the present invention is short, and production cost is low.If the surface requirements strictness, can also increase between aligning and scale sawing operation strips off the skin stretches or the polishing operation.
Embodiment
Embodiment 1: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 4%, zinc 3%, bismuth 3%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.5%, copper surplus.
Melting: earlier Cu is dropped into smelting furnace and carry out melting, treat to add Sn, Bi, Zn again after Cu dissolves, liquid level is made insulating covering agent by the calcining charcoal.
Refining: treat that raw material all melts the back intensification and carries out refining, 1100 ℃ of refining temperatures, refining time 10 minutes.
Analyze: stir sampling and do the Chemical Composition analysis.
Casting; Carry out horizontal continuous-casting after sampling analysis is qualified, crystallizer adopts water mold liner high purity graphite cover, and 1140 ℃ of casting temps were stopped cooling water pressure 0.01MPa 1 second in drop-down 1 second 15 meters/hour of casting speeds.
Embodiment 2: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 6%, zinc 5%, bismuth 6%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.3%, copper surplus.
Melting: earlier Cu is dropped into smelting furnace and carry out melting, treat to add Sn, Bi, Zn again after Cu dissolves, liquid level is made insulating covering agent by the calcining charcoal.
Refining: treat that raw material all melts the back intensification and carries out refining, 1800 ℃ of refining temperatures, refining time 15 minutes.
Analyze: stir sampling and do the Chemical Composition analysis.
Casting; Carry out horizontal continuous-casting after sampling analysis is qualified, crystallizer adopts water mold liner high purity graphite cover, and 1180 ℃ of casting temps were stopped cooling water pressure 0.03MPa 3 seconds in drop-down 3 seconds 23 meters/hour of casting speeds.
Embodiment 3: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 10.0%, zinc 12.0%, bismuth 8%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.2%, copper surplus.
Melting: earlier Cu is dropped into smelting furnace and carry out melting, treat to add Sn, Bi, Zn again after Cu dissolves, liquid level is made insulating covering agent by the calcining charcoal.
Refining: treat that raw material all melts the back intensification and carries out refining, 1250 ℃ of refining temperatures, refining time 30 minutes.
Analyze: stir sampling and do the Chemical Composition analysis.
Casting; Carry out horizontal continuous-casting after sampling analysis is qualified, crystallizer adopts water mold liner high purity graphite cover, and 1220 ℃ of casting temps were stopped cooling water pressure 0.05MPa 5 seconds in drop-down 5 seconds 303 meters/hour of casting speeds.
Embodiment 4: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 4%, zinc 3%, bismuth 2.0%+ nickel 0.1%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.5%, copper surplus.
Melting: earlier Cu or Ni input smelting furnace are carried out melting, treat to add Sn, Bi, Zn again after Cu or Ni dissolve, liquid level is made insulating covering agent by the calcining charcoal.
Other technology is with embodiment 1.
Embodiment 5: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 5%, zinc 4%, bismuth 6.0%+ nickel 0.3%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.3%, copper surplus.
Melting: earlier Cu or Ni input smelting furnace are carried out melting, treat to add Sn, Bi, Zn again after Cu or Ni dissolve, liquid level is made insulating covering agent by the calcining charcoal.
Other technology is with embodiment 2.
Embodiment 6: make Φ 16.8 * 2000mm bell metal bar
Batching: prepare burden by weight percentage, wherein tin 6%, zinc 5%, bismuth 8.0%+ nickel 0.5%, unavoidable impurities Pb+Sb+Fe+P+S+Si+Al sum be 0.2%, copper surplus.
Melting: earlier Cu or Ni input smelting furnace are carried out melting, treat to add Sn, Bi, Zn again after Cu or Ni dissolve, liquid level is made insulating covering agent by the calcining charcoal.
Other technology is with embodiment 3.
Subsequent technique adopts in the foregoing description:
Aligning: adopt seven roller straighteners that bar is carried out straightening;
Sawing: adopt circular saw machine that the finished product bar is according to the contract required to carry out sawing;
Check: the bar to sawing carries out Chemical Composition, mechanical property, cutting ability inspection;
Packing warehouse-in: the bar after the passed examination is packed warehouse-in.
Each alloy element action division is as follows among the present invention:
Copper: have high conduction, heat conductivility and good solidity to corrosion, weight ratio is the highest in tin zinc bismuth bronze.
Tin: stanniferous copper alloy has stronger corrosion stability and wear resistance, and its mechanical property is high fairly good and nonmagnetic with processing performance, does not produce spark during impact, but easily air-breathing and generation segregation, for proof strength and plasticity, its content should not be too high, should be controlled in 2.0～10.0% scopes.
Zinc: zinc is one of important interpolation element in the copper alloy, can improve the flowability of tin and copper containing alloy, dwindles the Tc interval, alleviate segregation and exhaust, but should not add too much, otherwise can make alloy property not reach desirable requirement, its content should be controlled in 3.0～12.0% scopes.
Bismuth: fusing point is lower, solid solubility in copper alloy matrix is minimum, has the effect of molten metal supply between the dendrite that promotes alloy final set part, effectively reduces the casting flaw of copper alloy, improve the machinability of alloy, harmless as the substitute element of lead.Because bismuth is present in crystal boundary with the simple substance state, too high levels can cause the on the low side and hetero-organization defective of plasticity, has a strong impact on alloy property; Content is crossed to hang down and is not then reached the alloy property condition that requires, so its content should be strict controlled between 2～8%.
Nickel: improve the corrosion stability and the toughness of alloy, its content is strict controlled between 0.1～0.5%.
Owing to do not add lead, extremely low as the lead in the foreign matter content, and strictnesses such as unavoidable impurities element such as Pb, Sb, Fe, P, S, Si, Al be controlled to be≤0.5%.
Claims (1)
1. an environment friendly free-cutting bronze alloy complete processing comprises batching, melting, refining, analysis, casting, aligning, sawing, inspection, packing warehouse-in, it is characterized in that: the batching in this complete processing, melting, refining, analysis, casting division are as follows:
I, batching
Get Sn2.0～10.0 by weight percentage, Zn3.0～12.0, Bi2.0～8.0 or Bi2.0～8.0+Ni0.1～0.5, inevitable impurity Pb+Sb+Fe+P+S+Si+Al sum≤0.5%, the Cu surplus is prepared burden;
II, melting
Earlier Cu or Cu+Ni input smelting furnace are carried out melting, treat to add Sn, Bi, Zn again after Cu or Cu+Ni dissolve, liquid level covers and adopts the calcining charcoal to make insulating covering agent;
III, refining
Treat that raw material all melts the back intensification and carries out refining, 1100～1250 ℃ of refining temperatures, refining time 10～30 minutes;
IV, analysis
The stirring sampling is done the Chemical Composition analysis and is seen whether meet batching proportion;
V, casting
Carry out horizontal continuous-casting after sampling analysis is qualified, crystallizer adopts water mold liner high purity graphite cover, and 1140～1220 ℃ of casting temps were stopped cooling water pressure 0.01～0.05MPa 1～5 second in drop-down 1～5 second 15～30 meters/hour of casting speeds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102307358A CN101381825B (en) | 2008-10-27 | 2008-10-27 | Environment friendly free-cutting bronze alloy processing technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102307358A CN101381825B (en) | 2008-10-27 | 2008-10-27 | Environment friendly free-cutting bronze alloy processing technique |
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| CN101381825A CN101381825A (en) | 2009-03-11 |
| CN101381825B true CN101381825B (en) | 2010-04-14 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818285B (en) * | 2010-04-12 | 2011-08-17 | 浙江佳鑫铜业有限公司 | Brass alloy for environment-friendly drinking water pipe and pipe workpiece thereof |
| CN101845571A (en) * | 2010-06-23 | 2010-09-29 | 广州市安达汽车零件有限公司 | Copper base alloy material for sliding bearing |
| CN102345024B (en) * | 2011-09-30 | 2014-05-14 | 绍兴万龙精密机械制造有限公司 | Smelting process of nickel bronze |
| CN102828063A (en) * | 2012-09-18 | 2012-12-19 | 苏州天兼金属新材料有限公司 | Novel lead-free environment-friendly high-strength wear-resistant copper-base alloy bar and preparation method thereof |
| CN103555992B (en) * | 2013-11-08 | 2016-03-30 | 苏州天兼金属新材料有限公司 | A kind of leadless environment-friendly copper base alloy rod and manufacture method thereof |
| CN107620769A (en) * | 2016-12-30 | 2018-01-23 | 合肥美诚机械有限公司 | A kind of automobile-used new material bearing |
| CN119120981B (en) * | 2024-11-13 | 2025-03-21 | 中铝科学技术研究院有限公司 | CuCr-X alloy, preparation method and application thereof |
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|---|---|---|---|---|
| CN1461815A (en) * | 2002-05-29 | 2003-12-17 | 三越金属株式会社 | Leadless easy cutted brass ally material and its manufacturing method |
| CN101003871A (en) * | 2006-01-18 | 2007-07-25 | 江西理工大学 | Copper alloy with no lead |
| CN101148714A (en) * | 2007-10-29 | 2008-03-26 | 北京科技大学 | A high pressure resistant cast copper alloy |
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- 2008-10-27 CN CN2008102307358A patent/CN101381825B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461815A (en) * | 2002-05-29 | 2003-12-17 | 三越金属株式会社 | Leadless easy cutted brass ally material and its manufacturing method |
| CN101003871A (en) * | 2006-01-18 | 2007-07-25 | 江西理工大学 | Copper alloy with no lead |
| CN101148714A (en) * | 2007-10-29 | 2008-03-26 | 北京科技大学 | A high pressure resistant cast copper alloy |
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Application publication date: 20090311 Assignee: Hebei Ou Tong non-ferrous metal Products Co., Ltd Assignor: Zhonglu Luoyang Copper Industry Co., Ltd. Contract record no.: 2015110000035 Denomination of invention: Environment friendly free-cutting bronze alloy processing technique Granted publication date: 20100414 License type: Exclusive License Record date: 20150724 |
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