1、Designation: B596 89 (Reapproved 2012)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 Department of Defense.1. Scope1.1 This specification covers a wrought allo
3、y 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 considered
4、 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 with
5、all hazards includingthose identified in the appropriate Material Safety Data Sheet(MSDS) for this product/material as provided by the manufac-turer, to establish appropriate safety and health practices, anddetermine the applicability of regulatory limitations prior touse.2. Referenced Documents2.1
6、ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsE8 Test Methods for Tension Testing of Metallic MaterialsE384 Test Method for Knoop and Vickers Hardness ofMaterials3. Materials and Manufacture3.1 Raw materials shall be of such quality
7、 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 properties.4. Chemical
8、 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 or Rockwell Superfi
9、cial), 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 Table 2, Table 3, Tab
10、le 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 SpecificationB476.7.1.1 Knoop hardn
11、ess 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 theaverage of the five inde
12、ntations. 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.7.1.3 All tests shall be conducted at room temperature, 65 to85F
13、(18 to 29C).7.2 Chemical analysis shall be performed by spectrochemi-cal or wet analysis methods. Fire assay is an acceptablealternative 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 fo
14、r 30 min at room temperature:7.3.1.1 Ferric Chloride (Fe Cl3)20 g,1This specification is under the jurisdiction 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 May
15、 1, 2012. Published May 2012. Originallyapproved in 1974. Last previous edition approved in 2006 as B596 89 (2006).DOI: 10.1520/B0596-89R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volum
16、e information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3.1.2 Hydrochloric Acid (HCl) (conc)80 mL, and7.3.1.3 Distilled Water250 mL.7.3.2 Remove the samples, th
17、oroughly 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 diameter is approximately one halfthe insi
18、de 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 spontaneous cracking,and if the samples do not
19、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 as listed below:8.1.1 Visual inspection a
20、t 103 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; gold alloy; lowcontact resistance; low e
21、nergy contact; non arcing contactAPPENDIX(Nonmandatory Information)X1. REFERENCE PROPERTIES FOR GOLDCOPPER ELECTRICAL CONTACT MATERIALX1.1 The following is a list of typical property valueswhich are useful for engineering calculations in electricalcontact design and application.AnnealedResistivityVc
22、mil/ft 76.4Vcm 12.7Density, g/cm317.32Solidus temperature,C 930TABLE 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) diameter)
23、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, HK 100A170 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,Annealed H
24、ard DrawnTensile strength, ksi (MPa) 65 max(450 max)80 min(550 min)Elongation in 2 in. or 50 mm, % 25 min 5 maxHardness, Knoop, HK 100A170 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 strength, ksi
25、 (MPa) 75 max(520 max)90 min(620 min)Elongation in 2 in. or 50 mm, % 15 min 3 maxHardness, Knoop, HK 100A170 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 max)90
26、 min(620 min)Elongation in 2 in. or 50 mm, % 15 min 3 maxHardness, Knoop, HK 100A170 max 200 minASee 7.1.1.B596 89 (2012)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expre
27、ssly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised
28、, 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 technical committee, which you may a
29、ttend. 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 Conshohocken, PA 19428-2959,United States
30、. 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 ASTM website (www.astm.org/COPYRIGHT/).B596 89 (2012)3
