ASTM_B_522_-_01_2017.pdf

Designation:B52201(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 last 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,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 considered 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/material 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 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.Referenced Documents2.1 ASTM Standards:2B476 Specification for General Requirements for WroughtPrecious Metal Electrical 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,pickling)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 tensilestrength,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 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 supplied 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 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 procured 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.Originallyapproved 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 standards 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 Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 8.Keywords8.1 contact alloy;electrical contact alloy;gold-silver-platinumAPPENDIX(Nonmandatory Information)X1.REFERENCE 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 IClass II