EP3908682A1 - Pb-free cu-zn alloy - Google Patents
Pb-free cu-zn alloyInfo
- Publication number
- EP3908682A1 EP3908682A1 EP21716326.0A EP21716326A EP3908682A1 EP 3908682 A1 EP3908682 A1 EP 3908682A1 EP 21716326 A EP21716326 A EP 21716326A EP 3908682 A1 EP3908682 A1 EP 3908682A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- free
- content
- alloy according
- product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910001297 Zn alloy Inorganic materials 0.000 title 1
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 97
- 239000000956 alloy Substances 0.000 claims abstract description 97
- 229910017518 Cu Zn Inorganic materials 0.000 claims abstract description 19
- 229910017752 Cu-Zn Inorganic materials 0.000 claims abstract description 19
- 229910017943 Cu—Zn Inorganic materials 0.000 claims abstract description 19
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000000137 annealing Methods 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 235000012438 extruded product Nutrition 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 abstract description 9
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- 239000000523 sample Substances 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000000047 product Substances 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910001369 Brass Inorganic materials 0.000 description 9
- 239000010951 brass Substances 0.000 description 9
- 239000011135 tin Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005242 forging Methods 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 239000011265 semifinished product Substances 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Definitions
- the invention relates to a Pb-free Cu-Zn alloy, in particular for the production of alloy products used under lubricated conditions.
- This alloy is also used to manufacture components that are used in hydraulics, such as distributor plates.
- This known alloy has the following composition (data in% by weight): Cu: 57.0 - 59.0%, Mn: 1.5 - 3.0%, Al: 1, 3 - 2.3%, Si: 0.3 - 1.3%, the remainder zinc and unavoidable impurities. Permissible admixtures are tolerated (data in% by weight): Ni: max. 1.0%, Fe: max. 1.0%, Sn: max. 0.4%, Pb: 0.2 - 0.8 %. As can be seen from the material designation already given, this previously known alloy contains Pb.
- the special brass alloy CW713R is characterized by versatile application properties, such as high wear and cavitation resistance, lubricant compatibility and sufficient mechanical properties, especially with regard to the strength and toughness of the alloy product. These also include good machinability.
- the element Pb is incorporated into brass alloys to achieve the desired machinability. For health and environmental reasons, efforts have recently been made to lay out lead-free brass alloys. Efforts are made, if possible, not to forego the properties brought about by the Pb element in the alloy.
- DE 102005017 574 A1 describes a wear-resistant brass alloy for synchronizer rings with an optional lead content.
- the composition (data in% by weight) is 57.5 - 59% copper, 2 - 3.5% manganese, 1 - 3% aluminum, 0.9 - 1.5% silicon, 0.15 - 0.4 % Iron, 0-1% lead, 0-1% nickel, 0-0.5% tin and the remainder zinc.
- WO 2014/152619 A1 discloses a brass alloy for turbochargers with the following composition, optionally containing lead (data in% by weight): 57-60% copper, 1.5-3.0% manganese, 1.3-2.3% Aluminum, 0.5-2.0% silicon, 0-1% nickel, 0-1% iron, 0-0.4% tin, 0-0.1% lead and the remainder zinc.
- JP S56-127741 A specifies a brass alloy with the following composition (data in% by weight): 54-66% copper, 1.0-5.0% manganese, 1.0-5.0% aluminum, 0 , 2 - 1, 5% silicon, 0.5 - 4.0% nickel, 0.1 - 2.0% iron, 0.2 - 2.0% tin and the remainder zinc.
- the invention is based on the object of proposing a Pb-free Cu-Zn alloy which is basically suitable for an application or use for which the alloy CuZn37Mn3AI2PbSi described above for the prior art is also suitable was. It would be desirable if the mechanical strength properties would even be improved compared to this textilekann th special brass alloy, but without having to accept losses in terms of cold and hot formability and machinability.
- Unavoidable impurities in the alloy are permitted at 0.05% by weight per element, whereby the sum of the unavoidable impurities does not exceed 0.15% by weight.
- This alloy is characterized above all by the selection of the alloy elements Ni, Fe and Sn, as well as by the claimed contents of these elements in the alloy composition in relation to the other alloy elements, especially Mn, Al and Si.
- This balanced alloy composition ensures particularly good properties of the alloy product in terms of cold and hot formability, machinability, strength and wear resistance, the latter especially under lubricated conditions.
- Bi is used as a Pb substitute in other special brass alloys, but the alloy according to the invention does not use Bi.
- the previously known alloy CuZn37Mn3AI2PbSi also has good hot formability
- the subject matter of the claimed alloy not only has particularly good hot formability, but also good cold formability. The latter was not the case with the previously known alloy.
- the alloy structure contains a proportion of ⁇ mixed crystals of less than 3 - 5%.
- the same advantages of stress relief annealing also apply to extruded products, whereby a structure with a mixed crystal content of 10-15% can also be achieved by the thermal treatment mentioned.
- the strength values achievable with this alloy and the surprisingly significantly better cavitation resistance than comparative alloys were not foreseeable for the people involved in the development of this alloy.
- the alloy products produced from the alloy according to the invention by forging have a 0.2% yield strength between 330 and 350 MPa, which is significantly more than was usual with forgings of the alloy CuZn37Mn3AI2PbSi (values from 230 to 300 MPa).
- the tensile strength of alloy products made from the alloy of the invention is 600 to 640 MPa. In the case of the previously known alloy CuZn37Mn3AI2PbSi, the tensile strength values are usually between 590 and 670 MPa. Somewhat higher tensile strength values can also be achieved with special treatments.
- the special properties of an alloy product made from this alloy are based on the fact that the Si content is preferably not less than the Ni content. Furthermore, the Sn content of the alloy is preferably adjusted so that it is a maximum of only 50% of the Ni content or a maximum of 50% of the Si content. The Ni content is preferably not less than the Si content, deviations of up to 0.075% being tolerated.
- the Fe content also plays a role in interaction with the other elements. The Fe content is preferably about 0.05% to 0.1% by weight less than the Ni content.
- FIGS. 1a, 1b show photomicrographs of the sample 1 in the pressing state from the start of the pressing (FIG. 1a along the pressing direction; FIG. 1b transversely to the pressing direction).
- Figures 2a, 2b show corresponding microstructural images from the end of the press.
- the samples cut from the pressed rods were thermally relaxed in a subsequent step, namely for three hours at 360 ° C. Solid solution content of about 14% has been formed. The proportion of intermetallic phases is a good 3%.
- FIGS. 3a, 3b show microstructural images of sample 2 after the stress relief annealing described above.
- the intermetallic phases are designated with IMP.
- the HBW hardness was measured as HBW 2.5 / 62.5.
- the structure of the comparative sample CW713R in the pressed state is dominated by ⁇ -phases with a proportion of ⁇ -mixed crystal phase of around 10%.
- the Pb contained in this alloy has a grain-refining effect and serves as a chip breaker.
- FIG. 4 shows a microstructure in sample CW713R in the pressed state and after an annealing treatment, corresponding to that of sample 2.
- the proportion of a mixed crystal phase is approximately 40-45%.
- FIGS. 5a, 5b The resulting microstructure of a preliminary product forged in this way for a distributor plate for a hydraulic application is shown in FIGS. 5a, 5b.
- FIG. 5a shows the microstructure at the edge
- FIG. 5b shows the microstructure in the core of the forged product.
- the proportion of a-phase increases significantly, up to about 40%.
- the alloy product according to the invention can be drawn directly. However, intermediate annealing before drawing is preferred in order to achieve an alloy product that is as stress-free as possible. Furthermore, additional investigations with the alloy compositions of samples 1 and 2 for differently set material states have shown that the tensile strength R m , the 0.2% proof stress, the elongation at break and the hardness HB also for directly drawn or for drawn after an intermediate annealing step Samples compared to semi-finished products made from the comparative alloy CW713R are significantly higher. The same was found for the variants of the specimens for a material condition after a final stress-relieving anneal.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Sliding-Contact Bearings (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202020101700.4U DE202020101700U1 (en) | 2020-03-30 | 2020-03-30 | Pb-free Cu-Zn alloy |
PCT/EP2021/058264 WO2021198236A1 (en) | 2020-03-30 | 2021-03-30 | Pb-free cu-zn alloy |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3908682A1 true EP3908682A1 (en) | 2021-11-17 |
EP3908682B1 EP3908682B1 (en) | 2022-08-17 |
Family
ID=75377759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21716326.0A Active EP3908682B1 (en) | 2020-03-30 | 2021-03-30 | Pb-free cu-zn alloy |
Country Status (9)
Country | Link |
---|---|
US (1) | US20230091831A1 (en) |
EP (1) | EP3908682B1 (en) |
JP (1) | JP2023520678A (en) |
KR (1) | KR20220155437A (en) |
CN (1) | CN115103921A (en) |
BR (1) | BR112022015524A2 (en) |
DE (1) | DE202020101700U1 (en) |
ES (1) | ES2927042T3 (en) |
WO (1) | WO2021198236A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021118907A1 (en) * | 2021-07-21 | 2023-01-26 | Diehl Brass Solutions Stiftung & Co. Kg | Lead-free brass alloy and uses thereof |
CN115198139B (en) * | 2022-08-31 | 2023-06-09 | 宁波金田铜业(集团)股份有限公司 | Wear-resistant brass alloy bar and preparation method thereof |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56127741A (en) | 1980-03-06 | 1981-10-06 | Honda Motor Co Ltd | Abrasion resistant copper alloy |
DE102005017574A1 (en) | 2005-04-16 | 2006-10-26 | Diehl Metall Stiftung & Co.Kg | Copper-zinc alloy and use of such an alloy |
PL2806044T3 (en) * | 2007-06-28 | 2018-03-30 | Wieland-Werke Ag | Copper-zinc alloy, method for its manufacture and use |
DE102007063643B4 (en) * | 2007-06-28 | 2012-07-26 | Wieland-Werke Ag | Copper-zinc alloy, method of manufacture and use |
TW201114926A (en) * | 2009-10-29 | 2011-05-01 | Globe Union Ind Corp | Eco-frienly brass alloy |
CN101787461B (en) * | 2010-03-02 | 2014-11-19 | 路达(厦门)工业有限公司 | Environment-friendly manganese brass alloy and manufacturing method thereof |
CN102251142A (en) * | 2011-07-25 | 2011-11-23 | 龙工(上海)桥箱有限公司 | Spherical hinge material for travel motor |
CN102851533A (en) * | 2012-09-26 | 2013-01-02 | 宁波正元铜合金有限公司 | Complex brass, preparation method and application thereof |
US10287653B2 (en) * | 2013-03-15 | 2019-05-14 | Garrett Transportation I Inc. | Brass alloys for use in turbocharger bearing applications |
DE102013008822A1 (en) * | 2013-05-24 | 2014-11-27 | Wieland-Werke Ag | Mine for pens and use |
CN103589903B (en) * | 2013-08-16 | 2016-04-20 | 武汉泛洲中越合金有限公司 | A kind of high-strength wear-resistant copper alloy and manufacture method thereof |
CN103725922B (en) * | 2014-01-16 | 2017-06-20 | 沈阳亚欧星海铜业有限公司 | A kind of unleaded silicon brass alloy and preparation method |
DE102014106933A1 (en) * | 2014-05-16 | 2015-11-19 | Otto Fuchs Kg | Special brass alloy and alloy product |
DE102014014239B4 (en) * | 2014-09-25 | 2024-04-11 | Wieland-Werke Ag | Electrical connecting element |
DE202016102696U1 (en) * | 2016-05-20 | 2017-08-29 | Otto Fuchs - Kommanditgesellschaft - | Special brass alloy as well as special brass alloy product |
JP2019178694A (en) * | 2018-03-30 | 2019-10-17 | 株式会社Ihi | Supercharger |
CN109930025A (en) * | 2019-03-22 | 2019-06-25 | 广东出入境检验检疫局检验检疫技术中心 | A kind of leadless environment-friendly free-cutting brass material |
-
2020
- 2020-03-30 DE DE202020101700.4U patent/DE202020101700U1/en active Active
-
2021
- 2021-03-30 US US17/790,947 patent/US20230091831A1/en active Pending
- 2021-03-30 KR KR1020227037503A patent/KR20220155437A/en unknown
- 2021-03-30 JP JP2022558022A patent/JP2023520678A/en active Pending
- 2021-03-30 BR BR112022015524A patent/BR112022015524A2/en unknown
- 2021-03-30 EP EP21716326.0A patent/EP3908682B1/en active Active
- 2021-03-30 ES ES21716326T patent/ES2927042T3/en active Active
- 2021-03-30 WO PCT/EP2021/058264 patent/WO2021198236A1/en unknown
- 2021-03-30 CN CN202180014863.2A patent/CN115103921A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
KR20220155437A (en) | 2022-11-22 |
EP3908682B1 (en) | 2022-08-17 |
CN115103921A (en) | 2022-09-23 |
ES2927042T3 (en) | 2022-11-03 |
WO2021198236A1 (en) | 2021-10-07 |
US20230091831A1 (en) | 2023-03-23 |
JP2023520678A (en) | 2023-05-18 |
DE202020101700U1 (en) | 2021-07-01 |
BR112022015524A2 (en) | 2022-10-11 |
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