ASTM_A_925_-_03_2014.pdf

Designation:A92503(Reapproved 2014)Standard Specification forZinc-5%Aluminum-Mischmetal Alloy-Coated SteelOverhead Ground Wire Strand1This standard is issued under the fixed designation A925;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.1.Scope1.1 This specification covers high-strength,extra-high-strength,and utilities grades of concentric lay steel wire strandcomposed of three wires or seven wires with Class A,Class B,or Class C zinc-5%aluminum-mischmetal(Zn-5 Al-MM)alloy coatings specifically intended for use as overhead groundwires or static wires for electric power transmission lines.1.2 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.2.Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB750 Specification for GALFAN(Zinc-5%Aluminum-Mischmetal)Alloy in Ingot Form for Hot-Dip CoatingsE27 Method for Spectrographic Analysis of Zinc and ZincAlloys by the Solution-Residue Technique(Withdrawn1985)3E47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys(Withdrawn 1997)32.2 Other Standard:4GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in Galfan Alloy(5-Al-0.04%La-0.04%Ce-Bal SHG Zn)3.Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology A902.4.Ordering Information4.1 Orders for strand purchased under this specificationshall include the following information:4.1.1 Quantity of each size,4.1.2 Size and grade of strand(Table 1),4.1.3 Class of Zn-5 Al-MM alloy coating(Section 11 andTable 2),and4.1.4 ASTM designation and year of issue.5.Materials and Manufacture5.1 Base MetalThe base metal shall be steel made by anycommercially accepted steel making process and of suchquality and purity that,when drawn to the size of wire specifiedand coated with Zn-5 Al-MM alloy,the finished strand and theindividual wires shall be of uniform quality and have theproperties and characteristics as prescribed in this specifica-tion.5.2 Coating Bath AnalysisThe bath metal used in continu-ous hot-dip Zn-5 Al-MM alloy coating shall meet the chemicalcomposition limits specified in Specification B750.5.2.1 For a two-step coating operation where the firstcoating is zinc(hot-dip galvanized or electrogalvanized)thefinal bath may have an aluminum content of up to 7.2%,toprevent depletion of the aluminum content of the bath.5.2.2 Method of AnalysisThe determination of chemicalcomposition shall be made in accordance with suitable chemi-cal(see Test Method E47),spectrochemical(see Method E27),or other methods.In case of dispute,the results secured by TestMethod E47 shall be the basis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium and lanthanum in a Zn-5Al-MM alloy has been established by the International LeadZinc Research Organization(Standard Practice GF-1).6.Stranding6.1 The strand shall have a left lay with a uniform pitch ofnot more than 16 times the nominal diameter of the strand.Aleft lay is defined as a counter-clockwise twist away from the1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Productsand is the direct responsibility of Subcom-mittee A05.12 on Wire Specifications.Current edition approved Aug.1,2014.Published August 2014.Originallyapproved in 1994.Last previous edition approved in 2009 as A925 03(2009)1.DOI:10.1520/A0925-03R14.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from International Lead Zinc Research Organization,292 MadisonAve.,New York,NY 10017.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 observer.Stranding shall be sufficiently close to ensure nosignificant reduction in diameter when stressed to 10%of theminimum breaking strength.7.Preforming Strand7.1 Preformed strand shall be supplied when so specified bythe purchaser.Strand is preformed when the component wiresare set to the helical form which they assume in the product byany means of process other than by merely laying them aboutthe strand core.8.Breaking Strength and Weight8.1 The approximate weight per unit length of strand andthe minimum breaking strength of the finished stra