1、Designation:B52012(Reapproved 2017)Standard Specification forTin-Coated,Copper-Clad Steel Wire for ElectronicApplication1This standard is issued under the fixed designation B520;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the yea
2、r 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 tin-coa
3、ted copper-clad steelwire for electronic application.1.2 Four classes of tin-coated copper-clad steel wire arecovered as follows:1.2.1 Class T30HSNominal 30%conductivity,hard-drawn,1.2.2 Class T30ANominal 30%conductivity,annealed,1.2.3 Class T40HSNominal 40%conductivity,hard-drawn,and1.2.4 Class T40
4、ANominal 40%conductivity,annealed.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.1.3.1 ExceptionThe SI values for resistivity and vol
5、umeare to be regarded as standard.1.4 The following safety hazards caveat pertains only to thetest method portion,Section 6,of this specification: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
6、 establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.(WarningConsideration should be givento toxicity and flammability when selecting solvent cleaners.)1.5 This international standard was developed in accor-dance with international
7、ly 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 is
8、sue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterialsB258 Specification for Nominal Diameters and Cross-SectionalAreas ofAWG Sizes of Solid Round Wires Usedas El
9、ectrical ConductorsB452 Specification for Copper-Clad Steel Wire for Elec-tronic Application2.3 National Institute of Standards and Technology:3NBS Handbook 100 Copper Wire Tables3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quant
10、ity of each size.3.1.2 Wire size(see 5.3 and Table 1),3.1.3 Class of wire(see 1.2),3.1.4 Package size and shipping(see 7.1.7 and Section 9),packaging inspection if required(see 9.3.3),3.1.5 Special package marking,if required,and3.1.6 Place of inspection(see 9.1).4.Material4.1 The basis material sha
11、ll consist of copper-clad steel wireconforming to the product description,quality and specifica-tion requirements of Specification B452.4.2 The tin-coated wire shall consist of the basis wire coatedwith tin.The tin used for coating shall be commercially pure(Note 1).For purposes of this specificatio
12、n,the tin shall beconsidered“commercially pure”if the total of other elements,1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.06 onBi-Metallic Conductors.Current edition approved April 1,2017.Published A
13、pril 2017.Originallyapproved in 1970.Last previous edition approved in 2012 as B520 12.DOI:10.1520/B0520-12R17.2For 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 standa
14、rds Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis int
15、ernational 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)Comm
16、ittee.1 exclusive of copper,does not exceed 1%.Notwithstanding theprevious sentence,chemical analysis of the tin coating or of thetin used for coating shall not be required under this specifica-tion.Adequacy of the tin coating is assured by the continuity ofcoating and adherence of coating requirements(see 5.4 and5.5).The quality of the tin-coated wire shall be such that thefinished product meets the properties and requirements in thisspecification.NOTE1It is necessary that the coating of the ti
