1、Designation: B596 89 (Reapproved 2017)Standard Specification forGold-Copper Alloy Electrical Contact Material1This standard is issued under the fixed designation B596; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification covers a wrought
3、 alloy containinggold and copper in the form of wire, rod, strip, and tubing forelectrical contacts.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not consi
4、dered standard.1.3 The following precautionary statement pertains to thetest method portion only, Section 7, of this standard: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to become familiar
5、with all hazards includingthose identified in the appropriate Safety Data Sheet (SDS) forthis product/material as provided by the manufacturer, toestablish appropriate safety and health practices, and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard
6、 was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Refer
7、enced Documents2.1 ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsE8 Test Methods for Tension Testing of Metallic MaterialsE384 Test Method for Microindentation Hardness of Mate-rials3. Materials and Manufacture3.1 Raw materials shal
8、l be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification.3.2 The material shall be finished by such operations (coldworking, heat treating, annealing, turning, grinding, pickling)as are required to produce the prescribed pr
9、operties.4. Chemical Composition4.1 Materials produced under the specification shall meetthe requirements of chemical composition shown in Table 1.5. Mechanical Properties5.1 The contract or order may specify ultimate tensilestrength, elongation, microhardness (Knoop or Vickers), hard-ness (Rockwell
10、 or Rockwell Superficial), or a combination ofthese mechanical properties as temper criterion. If the contractor order does not specify a temper criterion, then the criterionfor temper designation will be ultimate tensile strength.5.2 The material shall conform to the mechanical propertiesshown in T
11、able 2, Table 3, Table 4,orTable 5.5.3 The material shall be free of stress corrosion (as tested)in accordance with 7.3.6. General Requirements6.1 Specification B476 shall apply to all materials producedto this specification.7. Test Methods7.1 Test methods shall be in accordance with SpecificationB4
12、76.7.1.1 Knoop hardness tests shall be in accordance with TestMethod E384. Material 0.005 in. (0.13 mm) in thickness (ordiameter) and larger shall be tested using a 100-g indenter load.A minimum of five hardness indentations shall be made oneach specimen. The hardness value reported shall be theaver
13、age of the five indentations. Material less than 0.005 in. inthickness (or diameter) shall be tested with a 50-g indenterload.7.1.2 All tension tests shall be in accordance with TestMethods E8 and test specimens shall be full cross section,when practical.1This specification is under the jurisdiction
14、 of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.Current edition approved April 1, 2017. Published April 2017. Originallyapproved in 1974. Last previous edition approved in 2012 as B596 89
15、 (2012).DOI: 10.1520/B0596-89R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International
16、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides a
17、nd Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.17.1.3 All tests shall be conducted at room temperature, 65 to85F (18 to 29C).7.2 Chemical analysis shall be performed by spectrochemi-cal or wet analysis methods. Fire assay is an acceptablealterna
18、tive method for gold analysis.7.3 The stress corrosion test shall be performed as follows:7.3.1 Immerse test samples in a test solution of the follow-ing proportions for 30 min at room temperature:7.3.1.1 Ferric Chloride (Fe Cl3)20 g,7.3.1.2 Hydrochloric Acid (HCl) (conc)80 mL, and7.3.1.3 Distilled
19、Water250 mL.7.3.2 Remove the samples, thoroughly rinse, and dry. Dis-card the solution; do not reuse.7.3.3 Examine for cracks visible to the naked eye.7.3.4 If no cracks are visible, carry out the followingprocedure:7.3.4.1 Compress the ring or tube samples with pliers overa mandrel whose outside di
20、ameter is approximately one halfthe inside diameter of the ring.7.3.4.2 Bend wire, rod or tube or strip samples 180 arounda pin whose diameter is approximately five times the wire orstrip thickness.7.3.4.3 The material shall be considered free of stresscorrosion if the samples do not exhibit spontan
21、eous cracking,and if the samples do not show a greater tendency to crack thansamples that have not been immersed in the test solution buthave been compressed in the same manner.8. Inspection and Testing8.1 Material furnished under this specification shall beinspected and tested by the manufacturer a
22、s listed below:8.1.1 Visual inspection at 10 magnification.8.1.2 Tension or hardness test, or both, for temper verifica-tion.8.1.3 Dimensional inspection.8.1.4 Chemical analysis when indicated by the purchaseorder.8.1.5 Stress corrosion test.9. Keywords9.1 coin gold; contacts; electrical contacts; g
23、old alloy; lowcontact resistance; low energy contact; non arcing contactTABLE 1 Chemical RequirementsElement Weight, %Gold 89.091.0Copper balance 9.011.0Total, noble metal impurities 0.2 maxTotal, all other impurities 0.2 maxTABLE 2 Mechanical Properties of Wire (0.005 to 0.020 in. (0.13to 0.51 mm)
24、diameter)PropertyTemper,Annealed Hard DrawnTensile strength, ksi (MPa) 75 max(520 max)90 min(620 min)Elongation in 2 in. or 50 mm, % 15 min 3 maxHardness, Knoop, HK100A170 max 200 minASee 7.1.1.TABLE 3 Mechanical Properties of Wire (Over 0.020 to 0.060 in.(0.51 to 1.52 mm) diameter)PropertyTemper,An
25、nealed Hard DrawnTensile strength, ksi (MPa) 65 max(450 max)80 min(550 min)Elongation in 2 in. or 50 mm, % 25 min 5 maxHardness, Knoop, HK100A170 max 200 minASee 7.1.1.TABLE 4 Mechanical Properties of Strip (0.003 to 0.015 in. (0.076to 0.38 mm) thick)PropertyTemper,Annealed Hard RolledTensile streng
26、th, ksi (MPa) 75 max(520 max)90 min(620 min)Elongation in 2 in. or 50 mm, % 15 min 3 maxHardness, Knoop, HK100A170 max 200 minASee 7.1.1.TABLE 5 Mechanical Properties of Tubing (0.025 to 2.0 in. (0.64to 51 mm) outside diameter)PropertyTemper,Annealed Hard DrawnTensile strength, ksi (MPa) 75 max(520
27、max)90 min(620 min)Elongation in 2 in. or 50 mm, % 15 min 3 maxHardness, Knoop, HK100A170 max 200 minASee 7.1.1.B596 89 (2017)2APPENDIX(Nonmandatory Information)X1. REFERENCE PROPERTIES FOR GOLDCOPPER ELECTRICAL CONTACT MATERIALX1.1 The following is a list of typical property values whichare useful
28、for engineering calculations in electrical contactdesign and application.AnnealedResistivitycmil/ft 76.4cm 12.7Density, g/cm317.32Solidus temperature,C 930ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
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30、very five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible tec
31、hnical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
32、cken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 89 (2017)3
