ASTM_B_452_-_09_2015.pdf

Designation:B45209(Reapproved 2015)Standard Specification forCopper-Clad Steel Wire for Electronic Application1This standard is issued under the fixed designation B452;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 bare round copper-clad steelwire for electronic application.1.2 Four classes of copper-clad steel wire are covered asfollows:1.2.1 Class 30HSNominal 30%conductivity hard-drawn,1.2.2 Class 30ANominal 30%conductivity annealed,1.2.3 Class 40HSNominal 40%conductivity hard-drawn,and1.2.4 Class 40ANominal 40%conductivity annealed.1.3 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are in SI units.2.Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterials2B258 Specification for Nominal Diameters and Cross-SectionalAreas ofAWG Sizes of Solid Round Wires Usedas Electrical Conductors22.3 National Institute of Standards and Technology:NBS Handbook 100Copper Wire Tables33.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size and class,3.1.2 Wire size,diameter in inches(see 5.3 and Table 1),3.1.3 Class of wire(see 1.2 and Table 1),3.1.4 Packaging and shipping(Section 10),3.1.5 If inspection is required(see 6.3.3),and3.1.6 Place of inspection(see 6.1).4.Material4.1 The wire shall consist of a core of homogeneousopen-hearth,electric-furnace,or basic-oxygen steel with acontinuous outer cladding of copper thoroughly bonded to thecore throughout and shall be of such quality as to meet therequirements of this specification(Note 1).NOTE1The copper-clad steel wire provides a high-strength conductorfor use in wire and cable where greater strength is required and a lowerconductivity can be tolerated.At high frequencies the reduced conductiv-ity is less pronounced due to concentration of the current in the outerperiphery of the wire.Minimum thickness of 6%and 10%of the radiusfor 30 and 40%conductivity material,respectively,has been establishedto facilitate the inspection of thickness on fine wires.5.General Requirements5.1 Tensile Strength and ElongationThe copper-clad steelwire shall conform to the tensile strength and elongationrequirements of Table 1.For intermediate sizes not listed inTable 1,the elongation requirements of the next smaller sizeshall apply;in the case of tensile strength,the requirements ofthe next larger size shall apply.5.2 ResistivityThe electrical resistivity at a temperature of20C shall not exceed the values prescribed in Table 2.SeeNote 2 for calculating electrical resistance.NOTE2Relationships which may be useful in connection with thevalues of electrical resistivity prescribed in this specification are shown inTable 3.Resistivity units are based on the International Annealed CopperStandard(IACS)adopted by IEC in 1913,which is158mm2/m at 20Cfor 100%conductivity.The value of 0.017241 mm2/m and the value of0.15328 g/m2at 20C are respectively the international equivalent ofvolume and weight resistivity of annealed copper equal to 100%conductivity.The latter term means that a copper wire 1 in.in length andweighing 1 g would have a resistance of 0.15328.This is equivalent toa resistivity value of 875.20 lb/mile2,which signifies the resistance ofa copper wire 1 mile in length weighing 1 lb.It is also equivalent,forexample,to 1.7241/cm of length of a copper bar 1 cm2in cross section.A complete discussion of this subject is contained in NBS Handbook 100.The use of five significant figures in expressing resistivity does not implythe need for greater accuracy of measurement than that specified in Test1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.06 onComposite Conductors.Current edition approved April 1,2015.Published April 2015.Originallyapproved in 1967.Last previous edition approved in 2009 as B452 09.DOI:10.1520/B0452-09R15.2For 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.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 States1 Method B193.The