ASTM_A_855_-_A_855M_-_03_2014.pdf

Designation:A855/A855M03(Reapproved 2014)Standard Specification forZinc-5%Aluminum-Mischmetal Alloy-Coated Steel WireStrand1This standard is issued under the fixed designation A855/A855M;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 five grades of zinc-5%aluminum-mischmetal(Zn-5 Al-MM)alloy-coated,steel wirestrand,composed of a number of round,steel wires,with fourweights of Zn-5 Al-MM alloy coatings,suitable for use asguys,messengers,span wires,and for similar purposes.Theproduct is intended for applications requiring corrosion resis-tance and formability.1.2 The five grades covered are as follows:1.2.1 Utilities,1.2.2 Common,1.2.3 Siemens-Martin,1.2.4 High-strength,and1.2.5 Extra high-strength,1.2.6 Minimum breaking strengths of strand for each gradeare described in Section 7.1.3 The four weights of coatings are:Class1 and Classes A,B,and C.Minimum weights of Zn-5 Al-MM alloy aredescribed in Section 10.1.4 This specification is applicable to orders in eitherinch-pound units(as A855)or acceptable SI units(as A855M).Inch-pound units and SI units are not necessarily equivalent.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in Ingot Form for Hot-Dip CoatingsE47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys(Withdrawn 1997)3E1277 Test Method for Chemical Analysis of Zinc-5%Aluminum-Mischmetal Alloys by ICP Emission Spec-trometry2.2 Other Standard:GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in Galfan Alloy(5-Al-0.04%La-0.04%Ce-Bal SHG Zn)43.Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology A902.3.2 Definitions of Terms Specific to This Standard:3.2.1 strandthe designation of the finished strand shall beexpressed as the nominal diameter of the strand,the number ofthe wires in the strand and the minimum breaking strength ofthe strand(see Section 7),and the class of coating(see Section10).4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of strand in feet metres,4.1.2 Nominal strand diameter,number of wires,grade,andminimum breaking strength of strand(Section 6 and Table 1),4.1.3 Weight(class)of Zn-5 Al-MM alloy coating(Section10 and Table 2),and4.1.4 Length of strand in coils or on reels(Section 18).4.1.5 ASTM designation and year of issue as A855 for inchpound and A855M for SI units.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 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 1986.Last previous edition approved in 2009 as A855/A855M 03(2009).DOI:10.1520/A0855_A0855M-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,2525 MeridianParkway,P.O.Box 12036,Research Triangle Park,NC 27709-2036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 individual 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-5Al-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 for tin)ICP Argon Plasma Spectro-metric(see Test Method E1277)or other methods.In case ofdispute,the results secured by Test Method E1277 shall be thebasis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium a