ASTM_B_498_-_B_498M_-_08_2016.pdf

Designation:B498/B498M08(Reapproved 2016)Standard Specification forZinc-Coated(Galvanized)Steel Core Wire for Use inOverhead Electrical Conductors1This standard is issued under the fixed designation B498/B498M;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.1.Scope1.1 This specification covers round,zinc-coated,steel corewire with two classes of zinc coating for use in overheadelectrical conductors.1.2 This specification covers wire of diameter from 0.0500to 0.1900 in.or 1.27 to 4.82 mm,inclusive.1.3 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.2.Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsB6 Specification for ZincB193 Test Method for Resistivity of Electrical ConductorMaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Terminology3.1 Definitions:3.1.1 lotunless otherwise specified in the contract ororder,a lot shall consist of all coils of wire of the samediameter and unit lengths submitted for inspection at the sametime.3.1.2 product codeDefines product coating type,coatingclass and strength grade.Two product codes for productproduced to this specification:Class A Zinc Coated(CodeGA2);and Class C Zinc Coated(Code GC2).4.Classification4.1 The wire is furnished in two classes of coating,Class Aor Class C,as specified,in conformance with the requirementsof Section 10 and Table 6 or Table 7.5.Ordering Information5.1 Orders for material under this specification shall includethe following information:5.1.1 Quantity of each size,5.1.2 Wire diameter in inches or millimeters(Section 14),5.1.3 Product Code(see 3.1.2 and 4.1),5.1.4 Certification,if required(Section 19),5.1.5 Test report,if required(Section 19),and5.1.6 Package size(Section 20).5.1.7 Order Example:Five multiple lengths of 12 000 ft.each,0.1327 in.GA2 wire,packaged onto wooden nonreturn-able reels,with certified test report.6.Materials and Manufacture6.1 The base metal shall be steel produced by the open-hearth,electric-furnace,or basic-oxygen process.6.2 The wire shall be cold drawn and coated with zinc toproduce the desired properties.6.3 The slab zinc used for coating shall be high-grade orbetter,conforming to Specification B6.7.Chemical Composition7.1 The steel shall conform to the requirements prescribedin Table 1.7.2 Chemical analysis shall be conducted in accordancewith Test Methods,Practices,and Terminology A751.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.05 onConductors of Ferrous Metals.Current edition approved Oct.1,2016.Published October 2016.Originallypublished as B498 69 to replace B245 and B261.Last previous edition approvedin 2008 as B498/B498M 08.DOI:10.1520/B0498_B0498M-08R16.2For 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 States1 8.Tensile Test8.1 The zinc-coated steel core wire shall conform to thetensile and elongation requirements prescribed in Table 2 orTable 3.8.2 Tensile tests shall be conducted in accordance with TestMethods and Definitions A370,using the initial settings fordetermining stress at 1%extension given in Table 4 or Table5 of this specification.8.3 Test SpecimensThe test specimens shall be free ofbends or kinks other than the curvature resulting from the usualcoiling operations.Any hand straightening necessary to permitinsertion of the specimen in the jaws of the testing machineshall be performed by drawing between wood blocks or bysome other equally satisfactory means.9.Wrap Test9.1 The material,as represented by the test specimens,shallnot fracture when the galvanized wire is wrapped at a rate notexceeding 15 turns/min in a close helix of at least eight turnsaround a cylindrical mandrel with a diameter equal to twotimes the specified diameter of the wire under test,65%.10.Coating Tes