ASTM B958-2008 Standard Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc&x2013 5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead Ele.pdf
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1、Designation: B 958 08Standard 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 B 958; the number immediately following the designati
2、on 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.1. Scope1.1 This specification covers round, ex
3、tra-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
4、 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
5、 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 Documents
6、2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsB 193 Test Me
7、thod for Resistivity of Electrical ConductorMaterialsB 750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE 1277 Test Method for Chemical Analysis of Zinc-5 %Aluminum-MischmetalAlloys by ICP Emission Spectrom-etryE29 Practice for Using Significant Dig
8、its 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
9、alloy3.2 Definitions of Terms Specific to This Standard:3.3 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.3.4 Product Code, nDefines product coating type, coatingclass,
10、and strength grade.Extra High Strength Grade Zn5AlMM, Class A Coated,use Code MA4.Ultra High Strength Grade Zn5AlMM, Class A Coated,use 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 diame
11、ter 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 Code1This test method is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct respons
12、ibility of Subcommittee B01.05 onConductors of Ferrous Metals.Current edition approved Nov. 1, 2008. Published December 2008.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
13、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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
14、19428-2959, United States.5. Materials and Manufacture5.1 The base metal shall be steel produced by the open-hearth, electric furnace, or basic oxygen process.5.2 The wire shall be cold drawn and coated withZn5AlMM alloy to produce the desired properties.6. Chemical Composition6.1 The steel shall co
15、nform to the requirements prescribedin Table 1.6.2 Chemical analysis of the steel shall be conducted inaccordance with Test Methods, Practices, and TerminologyA 751.6.3 The ingot form of zinc-5 % aluminum-mischmetal alloyshall conform to Specification B 750.6.3.1 For a two-step coating operation whe
16、re 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 toSpecification B 750.7. Tensile Test7.1 The Zn5AlMM-coated steel
17、core wire shall conformto the tensile and elongation requirements prescribed in Table2, Table 3, Table 4,orTable 5 depending on which strengthgrade and unit base ordered.7.2 Tensile tests shall be conducted in accordance with TestMethods and Definitions A 370, using the initial settings fordetermini
18、ng stress at 1 % extension given in Table 6 or Table7 of this specification.7.3 Test Specimens The 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
19、 testing machineshall be performed by drawing between wood blocks or bysome other equally satisfactory means.7.4 The nominal diameter requested shall be used to deter-mine the applicable strength specification from the tables.8. Wrap Test8.1 The material, as represented by the test specimens, shalln
20、ot fracture when the Zn5AlMM alloy-coated wire iswrapped at a rate not exceeding 15 turns/min in a close helixof at least eight turns around a cylindrical mandrel with adiameter equal to four times the specified diameter of the wireunder test, 6 5%.9. Coating Test9.1 The Zn5AlMM alloy-coated wire sh
21、all conform to thecoating requirements prescribed in Table 8 or Table 9.9.2 The coating test shall be conducted in accordance withTest Method A 90/A 90M.10. Adherence of Coating Test10.1 The Zn5AlMM alloy-coated wire shall be capable ofbeing wrapped in a close helix at a rate not exceeding 15turns/m
22、in around a cylindrical mandrel having a diameter asprescribed in Table 10 or Table 11, without cracking or flakingthe coating to such an extent that any Zn5AlMM alloy canbe removed by rubbing with the bare fingers.11. Joints11.1 No joints shall be made in the finished wire.TABLE 1 Chemical Requirem
23、entsElement Composition, %Carbon 0.50 to 1.00Manganese 0.40 to 1.30Phosphorus, max 0.035Sulfur, max 0.045Silicon 0.15 to 0.60TABLE 2 Grade 4 Extra-High-Strength Tensile RequirementsSpecified Diameter,in.Stressat 1% Extension,min, kpsiUltimateTensile Strength,min, kpsiElongationin 10 in.,min %0.0500
24、to 0.0899, incl 225 265 3.00.0900 to 0.1199, incl 220 260 3.00.1200 to 0.1399, incl 215 255 3.50.1400 to 0.1900, incl 210 250 3.5TABLE 3 Grade 4 Extra-High-Strength Tensile Requirements(Metric)Specified Diameter,mmStressat 1% Extension,min, MPaUltimateTensile Strength,min, MPaElongationin 250 mm,min
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