1、Designation: B522 01 (Reapproved 2017)Standard Specification forGold-Silver-Platinum Electrical Contact Alloy1This standard is issued under the fixed designation B522; 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 69 % gold
3、, 25 % silver, 6 %platinum alloy tubing, rod, wire, and sheet material for slidingelectrical 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 con
4、sidered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateSafety Data Sheet (SDS) for this product/mat
5、erial as providedby the manufacturer, to establish appropriate safety and healthpractices, and determine the applicability of regulatory limi-tations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established i
6、n 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. Referenced Documents2.1 ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal E
7、lectrical Contact Materials3. Manufacture3.1 Raw materials shall 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, annealing, turning, grinding, pickl
8、ing) as are requiredto produce the prescribed properties.4. Chemical Composition4.1 Material produced under the specification shall meet therequirements for chemical composition prescribed in Table 1.5. Mechanical and Electrical Requirements5.1 The contract or order may specify ultimate tensilestren
9、gth, elongation, microhardness (Knoop or Vickers), hard-ness (Rockwell 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
10、 andelongation.5.1.1 Knoop hardness indentations shall be made so that thelong axis of the indenter is parallel to the rolling or drawingdirection of the material.5.2 Mechanical and electrical properties shall conform tothe requirements of Table 2 and Table 3.5.3 All test specimens shall be the supp
11、lied size whenpractical.5.4 All tests are to be conducted at room temperature (65 to80F) (18 to 27C).6. General Requirements6.1 Specification B476 shall apply to all materials producedto this specification.7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by
12、the manufacturer as follows:7.1.1 Visual inspection of 10,7.1.2 Temper test (hardness or tensile),7.1.3 Dimensional tests, and7.1.4 Spectrographic or chemical analysis when indicatedby the purchase order.7.2 The purchaser shall perform such tests as are required toverify the quality of material proc
13、ured under this specification.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 April 1, 2017. Published April 2017. Or
14、iginallyapproved in 1970. Last previous edition approved in 2012 as B522 01 (2012).DOI: 10.1520/B0522-01R17.2For 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 stan
15、dards Document Summary page onthe ASTM website.Copyright ASTM International, 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 Dec
16、ision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.18. Keywords8.1 contact alloy; electrical contact alloy; gold-silver-platinumAPPENDIX(Nonmandatory Information)X1. REFERENC
17、E PROPERTIES OF GOLD-SILVER-PLATINUM ELECTRICAL CONTACT ALLOYX1.1 Table X1.1 provides a list of typical property valueswhich are useful for engineering calculations in electricalcontact design and application.TABLE 1 Chemical RequirementsElementComposition, weight %Class I Class IIGold 68.070.0 68.5
18、69.5Silver 23.526.5 24.525.5Platinum 5.07.0 5.56.5Selected base metals (Pb, Sb, Bi, Sn,As, Cd, Ge, Ti, and Ga), max. 0.01Sulfur, max . 0.01Total platinum group metal impurities, max 0.15 0.15Total base metal impurities, max 0.20 0.1TABLE 2 Mechanical Properties, Wire 0.010 to 0.020-in. (0.25 to0.51-
19、mm) Diameter Strip 0.003 to 0.020 in. (0.08 to 0.51 mm) thickPropertiesTemperAnnealed Work-HardenedKnoop hardness, 100-gf load(50 gf below 0.005 in. (0.13 mm)thick), HK70 to 105 120 to 170Ultimate tensile strength, psi, 35 000 to 45 000 60 000 to 85 000MPa 240 to 310 410 to 590Elongation in 2 in. or
20、 50 mm, % 25 min 1 minTABLE 3 Mechanical Properties, Wire over 0.020 to 0.060-in. (0.51to 1.52-mm) DiameterPropertiesTemperAnnealed Work-HardenedKnoop hardness, 100-gf load, HK 70 to 105 125 to 170Ultimate tensile strength, psi, 35 000 to 45 000 55 000 to 75 000MPa 240 to 310 380 to 520Elongation in
21、 2 in. or 50 mm, % 25 min 1 minTABLE X1.1 Typical Physical PropertiesPropertiesTemperAnnealed Work-HardenedResistivity, cmil/ft, 95 95cm 15.7 15.7Density,Ag/cm3, 16.0 16.0dwt/in.3169 169Solidus temperature,C 1025 1025Modulus of elasticity in tension, psi, 13 10613106MPa 89.6 10389.6 103Proportional
22、limit, psi, 18 000 30 000MPa 120 210Adwt is the abbreviation for pennyweight, which equals120 of a troy ounce.B522 01 (2017)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 ex
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25、y 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 Conshohocken, PA 19428-2959,United Sta
26、tes. 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:/ 01 (2017)3