ASTM_B_684_-_B_684M_-_16.pdf

Designation:B684/B684M16Standard Specification forPlatinum-Iridium Electrical Contact Materials1This standard is issued under the fixed designation B684/B684M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript 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.Scope*1.1 This specification covers an 85%platinum15%iridium alloy,and a 90%platinum10%iridium alloy,in theform of rod,wire,strip,and sheet material for electricalcontacts.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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.2.Referenced Documents2.1 ASTM Standards:2B277 Test Method for Hardness of Electrical Contact Mate-rialsB476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsB542 Terminology Relating to Electrical Contacts and TheirUseE8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE384 Test Method for Microindentation Hardness of Mate-rials3.Terminology3.1 For definitions of terms related to electrical contactmaterials,refer to Terminology B542.4.General Requirements4.1 The requirements of Specification B476 shall apply toall materials produced to this specification.4.2 In addition,when a section with a title identical to thatreferenced in 4.1 appears in this specification,it containsadditional requirements which supplement those appearing inSpecification B476.5.Ordering Information5.1 Include the following information when placing ordersfor product under this specification,as applicable:5.1.1 ASTM designation and year of issue,5.1.2 Grade of material(see Table 1),5.1.3 Temper(annealed or work hardened,see Table 2 andTable 3),5.1.4 Form(rod,wire,sheet,or strip),5.1.5 Dimensions and tolerances,5.1.6 Quantity,total weight or total length or number ofpieces of each size,5.1.7 Heat identification or traceability details,if required,5.1.8 Certification and/or Test Report,if required.6.Materials and Manufacture6.1 Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification.6.2 The material shall be finished by such operations(coldworking,annealing,turning,grinding,or pickling)as arerequired to produce the prescribed properties.7.Chemical Composition7.1 Material produced under the specification shall meet therequirements of chemical composition prescribed in Table 1.7.2 By agreement between purchaser and manufacturer,analysis may be required and limits established for elements orcompounds not specified in the table of chemical composition.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 June 1,2016.Published June 2016.Originallyapproved in 1981.Last previous edition approved in 2012 as B684 97(2012).DOI:10.1520/B0684_B0684M-16.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1Analysis is regularly made for the elements for which specificlimits are listed.If,however,the presence of“other”elements is suspectedor indicated in the course of routine analysis,further analysis shall bemade to determine that the total of these“other”elements and the listedimpurities is not in excess of the total impurities limit.8.Mechanical Property Requirements8.1 The contract or purchase order may specify ultimatetensile strength,elongation,microhardness(Knoop orVickers),hardness(Rockwell or Rockwell Superficial),or acombination of these mechanical properties as temper crite-rion.If the contract or order does not specify a temper criterion,then the criterion for temper designation will be ultimatetensile strength.8.2 The mechanical prop