ASTM_B_958_-_B_958M_-_16.pdf

Designation:B958/B958M16Standard Specification forExtra-High-Strength and Ultra-High-Strength Class AZinc5%Aluminum-Mischmetal Alloy-Coated Steel CoreWire for Use in Overhead Electrical Conductors1This standard is issued under the fixed designation B958/B958M;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,extra-high-strength,andultra-high-strength,Class A coated zinc5%aluminum-mischmetal(Zn5AlMM)alloy-coated,steel core wire foruse in Overhead Electrical Conductors.1.2 This specification covers wire of diameter from 0.0500to 0.1900 in.inclusive 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.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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 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 ProductsB193 Test Method for Resistivity of Electrical ConductorMaterialsB750 Specification for GALFANE1277 Test Method for Analysis of Zinc-5%Aluminum-Mischmetal Alloys by ICP Emission SpectrometryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Standard:GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in GalfanAlloy(5%Al-0.04%La-0.04%Ce-Bal SHG Zn)33.Terminology3.1 Abbreviations:3.1.1 MMmischmetal3.1.2 Zn5AlMMzinc5%aluminum mischmetal alloy3.2 Definitions of Terms Specific to This Standard:3.2.1 Lot,nUnless 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.3.2.2 Product Code,nDefines product coating type,coat-ing class,and strength grade.3.2.2.1 Extra High Strength Grade Zn5AlMM,Class ACoateduse Code MA4.3.2.2.2 Ultra High Strength Grade Zn5AlMM,Class ACoateduse Code MA5.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size,4.1.2 Wire diameter in inches or millimeter(Section 13),4.1.3 Certification,if required(Section 18),4.1.4 Test report,if required(Section 18),and4.1.5 Package Size(Section 19).4.1.6 Product Code5.Materials and Manufacture5.1 The base metal shall be steel produced by the open-hearth,electric furnace,or basic oxygen process.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 Dec.1,2016.Published December 2016.Originallyapproved in 2008.Last previous edition approved in 2008 as B958 081.DOI:10.1520/B0958_B0958M-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.3Available from the International Lead Zinc Research Organization(ILZRO),1822 NC Highway 54 East,Suite 120,Durham NC 27713,http:/www.ilzro.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The wire shall be cold drawn and coated withZn5AlMM alloy to produce the desired properties.6.Chemical Composition6.1 The steel shall conform to the requirements prescribedin Table 1.6.2 Chemical analysis of the steel shall be conducted inaccordance with Test Methods,Practices,and TerminologyA751.6.3 The ingot form of zinc-5%aluminum-mischmetal alloyshall conform to Specification B750.6.3.1 For a two-step coating operation where the firstcoating is zinc(hot-dip galvanized or electro-galvanized),thefinal bath may have an aluminum content of up to 7.2%,toprevent depletion of the aluminum content of the bath.6.3.2 Method of Coating Material AnalysisRefer to Speci-fication B750.7.Tensile Test7.1 The Zn5AlMM-coated steel core wire shall conformto the tensile and elongation requirements prescribed in Table2,Table 3,Table 4,or Table 5 depending on which strengthgrade and unit base ordered.7.2 Tensile tests shall be conducted in accordance with TestMethod