WO2011120077A1 - Brass allloy - Google Patents
Brass allloy Download PDFInfo
- Publication number
- WO2011120077A1 WO2011120077A1 PCT/AU2011/000348 AU2011000348W WO2011120077A1 WO 2011120077 A1 WO2011120077 A1 WO 2011120077A1 AU 2011000348 W AU2011000348 W AU 2011000348W WO 2011120077 A1 WO2011120077 A1 WO 2011120077A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lead
- amount
- weight
- alloy
- dezincification
- Prior art date
Links
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
Definitions
- the invention relates to a brass alloy.
- the invention relates to a brass alloy having a low lead content.
- Brass is an alloy of copper and zinc in which the proportions of copper and zinc and other elements can be varied to create a range of brasses. Brasses also frequently contain lead to improve machinability or to act as a lubricant. When lead is added to brass, the lead, which is nearly insoluble in brass, becomes discrete particles distributed fairly evenly throughout the brass. Then, when the brass is machined to form a component the surplus brass is removed in chip form rather than as long coils when no lead is added. This allows more complex parts to be machined with much easier removal of the surplus material from the tooling and the machine and with significantly less power being required for the machining process.
- any low-lead alloy will still need to have acceptable machining properties.
- One attempt to achieve a low-lead copper alloy involves replacing some or all of the lead with silicon.
- a silicon copper alloy which is claimed to have industrially satisfactory properties contains 69 to 80% copper, 1.8 to 4% silicon, 0.02 to 0.4% lead with the remainder consisting of zinc (US 7056396).
- This silicon alloy may also contain small amounts of arsenic, antimony, aluminium, phosphorus, bismuth, tellurium and/or selenium depending on the desired final properties of the alloy.
- Another attempt to achieve a low-lead or essentially lead free copper alloy involves replacing some or all of the lead content with bismuth.
- Bismuth has several properties that are similar to lead and, in particular, is also nearly insoluble in an alloy of copper and zinc. Therefore, bismuth aids machinability in a similar way to lead.
- One example of an essentially lead free copper alloy contains 1.8 to 5% by weight of bismuth (US 5137658).
- Another example of a lead free wrought copper alloy contains at least 60% copper, at least 0.5% bismuth and at least one of phosphorus, indium or tin (US 5167726).
- a low-lead brass alloy can be produced that has the required five essential properties of good casting properties, good hot working properties, good cold working properties, good machining properties, good dezincification properties and also be less costly to produce than other low lead alloys so far developed.
- a small amount of lead in combination with bismuth, tin and a dezincification agent eg arsenic, phosphorus and antimony
- a brass alloy comprising:
- the amount of bismuth is about 0.7% by weight.
- the amount of lead is about 0.22% by weight.
- the amount of tin is about 0.3% by weight.
- the dezincification agent(s) is/are selected from arsenic, phosphorous, antimony and/or any other dezincification agent.
- the dezincification agents(s) is/are preferable present in an amount of 0.02 to 0.3%.
- the dezincification agent(s) is/are preferable present in an amount of 0.05 to 0.4%.
- the dezincification agent(s) is/are preferable present in an amount of 0.05 to 0.2%.
- the total amount of dezincification agent(s) is present in an amount of about 0.12% by weight.
- the dezincification agent(s) is arsenic and/or phosphorus.
- single dezincification agents are used but the use of mixtures of these agents is not excluded from the scope of the invention.
- phosphorous is often used when arsenic is either not acceptable or only acceptable in quantities insufficient to achieve the desired dezincification properties. Accordingly, it is envisaged that in such a situation a combination of arsenic and phosphorous in the alloy may be adopted.
- tin is more compatible with lead and bismuth than other elements e.g. aluminium and, in the above formulation, the proportions of lead, bismuth and tin have resulted in enhanced machining properties without adversely affecting the other properties. It is believed that it is the proportions of tin, lead, bismuth (and the presence of a dezincification agent) within the defined fairly narrow range that is important in this brass alloy in achieving the required five essential properties of good casting properties, good hot working properties, good cold working properties, good machining properties, good dezincification properties and also be less costly to produce than other low lead alloys so far developed.
- impurities may be present in each of the aspects and if present, no individual other element will be present in an amount of more than 0.2% by weight.
- impurities may be present in each of the aspects and if present, no individual other element will be present in an amount of more than 0.2% by weight.
- the ideal alloy will have as little lead and bismuth as possible given the potential application discussed whilst still retaining the desired acceptable machining properties.
- the amount of bismuth present is about 0.7% by weight.
- the zinc content is controlled by the need to comply with the Dezincification Requirements.
- Dezincification can be a problem in alloys containing more than 15% zinc.
- Dezincification selectively removes zinc from the alloy leaving behind copper rich porous structure that has significantly lower mechanical strength. The dezincification can progress through the brass weakening the entire component and causing it to leak.
- the alloy of the invention contains a dezincification agent(s) to provide the Dezincification Resistant properties that virtually all copper based products in contact with water now need to have.
- the brass alloy according to the invention can be produced using any known method. It can be produced using all new raw materials, or it can be produced using recycled alloy materials, or it can be produced using a combination of new and recycled materials.
- This example demonstrates a brass alloy according to the invention.
- a brass alloy was prepared having the following composition limits:
- the alloy was prepared using 70/30 copper/zinc alloy (purely copper and zinc with low impurities), 60/40 lead bearing brass scrap, bismuth, tin and copper arsenic alloy.
- Example 2
- a brass alloy was prepared having the following composition:
- the alloy was prepared using 70/30 copper/zinc alloy (purely copper and zinc with low impurities), pure bismuth, 60/40 lead bearing brass scrap, bismuth, tin, and copper arsenic alloy.
- Example 1 and Example 2 were found to have the required five essential properties of good casting properties, good hot working properties, good cold working properties, good machining properties, good dezincification properties and also be less costly to produce than other low lead alloys so far developed.
- the resultant alloys had:
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Domestic Plumbing Installations (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020127026413A KR20130029378A (en) | 2010-03-30 | 2011-03-29 | Brass alloy |
US13/638,412 US20130084207A1 (en) | 2010-03-30 | 2011-03-29 | Brass alloy |
AU2011235590A AU2011235590B2 (en) | 2010-03-30 | 2011-03-29 | Brass allloy |
EP11761819A EP2553130A1 (en) | 2010-03-30 | 2011-03-29 | Brass allloy |
CA2794915A CA2794915A1 (en) | 2010-03-30 | 2011-03-29 | Brass alloy |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010901340A AU2010901340A0 (en) | 2010-03-30 | Brass alloy | |
AU2010901340 | 2010-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011120077A1 true WO2011120077A1 (en) | 2011-10-06 |
Family
ID=44695829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2011/000348 WO2011120077A1 (en) | 2010-03-30 | 2011-03-29 | Brass allloy |
Country Status (7)
Country | Link |
---|---|
US (1) | US20130084207A1 (en) |
EP (1) | EP2553130A1 (en) |
KR (1) | KR20130029378A (en) |
CN (1) | CN102206772A (en) |
AU (1) | AU2011235590B2 (en) |
CA (1) | CA2794915A1 (en) |
WO (1) | WO2011120077A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ306429B6 (en) * | 2015-10-07 | 2017-01-18 | Comtes Fht A.S. | Machinable brass with a reduced lead content suitable for forming by cold rolling |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103667777B (en) * | 2013-11-27 | 2015-11-04 | 余姚市士森铜材厂 | A kind of leadless environment-friendly brass section bar of rolling and forming |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996039546A1 (en) * | 1995-06-06 | 1996-12-12 | Starline Manufacturing Company, Incorporated | Brass alloys |
CN101113501A (en) * | 2007-08-16 | 2008-01-30 | 宁波博威集团有限公司 | Low-lead-boron easy-cutting antimony brass alloy and method for manufacturing same |
CN101225487A (en) * | 2008-01-15 | 2008-07-23 | 胡旭红 | Arsenic-containing low-lead brass alloy |
CN101709404A (en) * | 2009-12-09 | 2010-05-19 | 浙江天申铜业有限公司 | Lead-free environment-friendly bismuth brass alloy rod or alloy ingot and preparation method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000087158A (en) * | 1998-09-11 | 2000-03-28 | Furukawa Electric Co Ltd:The | Copper alloy for semiconductor lead frame |
US20030095887A1 (en) * | 2000-06-30 | 2003-05-22 | Dowa Mining Co., Ltd. | Copper-base alloys having resistance to dezincification |
JP4296344B2 (en) * | 2003-03-24 | 2009-07-15 | Dowaメタルテック株式会社 | Copper alloy material |
CZ20032094A3 (en) * | 2003-08-01 | 2005-04-13 | Kovohutě Čelákovice A. S. | Architectural bronze |
JP3964930B2 (en) * | 2004-08-10 | 2007-08-22 | 三宝伸銅工業株式会社 | Copper-base alloy castings with refined crystal grains |
-
2010
- 2010-06-29 CN CN201010218203XA patent/CN102206772A/en active Pending
-
2011
- 2011-03-29 KR KR1020127026413A patent/KR20130029378A/en not_active Application Discontinuation
- 2011-03-29 AU AU2011235590A patent/AU2011235590B2/en not_active Withdrawn - After Issue
- 2011-03-29 EP EP11761819A patent/EP2553130A1/en not_active Withdrawn
- 2011-03-29 WO PCT/AU2011/000348 patent/WO2011120077A1/en active Application Filing
- 2011-03-29 US US13/638,412 patent/US20130084207A1/en not_active Abandoned
- 2011-03-29 CA CA2794915A patent/CA2794915A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996039546A1 (en) * | 1995-06-06 | 1996-12-12 | Starline Manufacturing Company, Incorporated | Brass alloys |
CN101113501A (en) * | 2007-08-16 | 2008-01-30 | 宁波博威集团有限公司 | Low-lead-boron easy-cutting antimony brass alloy and method for manufacturing same |
CN101225487A (en) * | 2008-01-15 | 2008-07-23 | 胡旭红 | Arsenic-containing low-lead brass alloy |
CN101709404A (en) * | 2009-12-09 | 2010-05-19 | 浙江天申铜业有限公司 | Lead-free environment-friendly bismuth brass alloy rod or alloy ingot and preparation method thereof |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ306429B6 (en) * | 2015-10-07 | 2017-01-18 | Comtes Fht A.S. | Machinable brass with a reduced lead content suitable for forming by cold rolling |
Also Published As
Publication number | Publication date |
---|---|
AU2011235590B2 (en) | 2014-01-09 |
AU2011235590A1 (en) | 2012-11-08 |
KR20130029378A (en) | 2013-03-22 |
CA2794915A1 (en) | 2011-10-06 |
EP2553130A1 (en) | 2013-02-06 |
US20130084207A1 (en) | 2013-04-04 |
CN102206772A (en) | 2011-10-05 |
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