ASTM_B_476_-_01_2017.pdf

Designation:B47601(Reapproved 2017)Standard Specification forGeneral Requirements for Wrought Precious Metal ElectricalContact Materials1This standard is issued under the fixed designation B476;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 general requirements commonto wrought precious metal electrical contact alloy products inthe form of sheet,strip,wire,and rod.Unless otherwisespecified in the purchase order or in an individual specification,these general requirements shall apply to wrought electricalcontact materials where indicated in the applicable productspecifications issued by ASTM.1.2 In case of conflict,the requirements on the purchaseorder,the individual specification,and this general specifica-tion shall prevail in the sequence named.1.3 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.1.4 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.1.5 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 The following documents of the issue in effect,on thedate of material purchase,form a part of this specification tothe extent referenced herein:2.2 ASTM Standards:2B63 Test Method for Resistivity of Metallically ConductingResistance and Contact MaterialsB772 Guide for Specifying the Chemical Compositions forElectrical Contact Materials(Arcing and Nonarcing)E3 Guide for Preparation of Metallographic SpecimensE8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical CompositionE112 Test Methods for Determining Average Grain SizeE384 Test Method for Microindentation Hardness of Mate-rials3.Terminology3.1 Definitions:3.1.1 lot,nthe quantity of material of the same type,size,and finish produced at one time from the same cast or heat,andheat treated in the same heat-treatment cycle.4.Ordering Information4.1 Orders for material to this specification shall include thefollowing information:4.1.1 Designation and revision date of this specification.4.1.1.1 If a revision date is not designated,the latest revisionshould be used.4.1.2 Designation and revision date of the applicable prod-uct specification.4.1.2.1 If a revision date is not designated,the latest revisionof the product specification should be used.4.1.3 Description of material form,4.1.4 Dimensions of the material,4.1.5 Total quantity of each size,4.1.6 Temper of the material(annealed,cold worked,etc.),4.1.7 Temper test(hardness or tensile)(Section 10),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 1968.Last previous edition approved in 2012 as B476 01(2012).DOI:10.1520/B0476-01R17.2For 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 4.1.8 Special requirements(if any),and4.1.9 Certification(Section 14).4.2 Specify the following,if required:4.2.1 Certificate of compliance of physical and chemicalrequirement.4.2.2 Test DataSpecify tests and analyses to be performe