ASTM_A_475_-_03_2014.pdf

Designation:A47503(Reapproved 2014)Standard Specification forZinc-Coated Steel Wire Strand1This standard is issued under the fixed designation A475;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers five grades of zinc-coated,steel wire strand,composed of a number of round,steel wires,with four weights of zinc coatings,suitable for use as guys,messengers,span wires,and for similar purposes.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 zinc coatings are:Class 1 andClasses A,B,and C.Minimum weights of zinc coatings aredescribed in Section 10.1.4 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-uctsB6 Specification for Zinc3.Terminology3.1 DefinitionsFor definitions of terms used in thisstandard,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,the minimum breaking strength of thestrand(see Section 7),and the class of coating(see Section 10).4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of strand in feet,4.1.2 Nominal strand diameter,number of wires,grade,andminimum breaking strength of strand(Section 7 and Table 1),4.1.3 Weight(class)of zinc coating(Section 10 and Table2),4.1.4 Length of strand in coils or on reels(Section 18),and4.1.5 ASTM designation and year of issue.5.Materials and Manufacture5.1 The base metal shall be steel made by any commerciallyaccepted steel making process and of such quality and puritythat,when drawn to the size of wire specified and coated withzinc,the finished strand and the individual wires shall be ofuniform quality and have the properties and characteristics asprescribed in this specification.5.2 The slab zinc,when used for the coating,shall be anygrade of zinc conforming to Specification B6.6.Stranding6.1 Unless otherwise specified,strand shall have a left lay.Aleft lay is defined as a counter-clockwise twist away from theobserver.All wires shall be stranded with uniform tension.Stranding shall be sufficiently close to ensure no appreciablereduction in diameter when stressed to 10%of the minimumbreaking strength.6.2 The 3-wire strand shall consist of three wires concen-trically twisted with a uniform pitch of not less than 14 normore than 20 the specified nominal diameter of the strand.6.3 The 7-wire strand shall consist of a center wire with a6-wire layer concentrically twisted over it with a uniform pitchof not more than 16 the specified nominal diameter of thestrand.1This 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 September 2014.Originallyapproved in 1962.Last previous edition approved in 2009 as A475-03(2009)1.DOI:10.1520/A0475-03R14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TABLE 1 Physical Properties of Zinc-Coated Steel Wire StrandNOTE1The numbers in boldface type indicate sizes and grades most commonly used and readily available.NominalDiameterof Strand,in.(mm)Numberof Wiresin StrandNominalDiameterof CoatedWires inStrand,in.(mm)ApproximateWeight ofStrand,lb/1000ft(kg/km)Minimum Breaking Strength of Strand,lbf(kN)Utilities GradeACommonGradeSiemens-MartinGradeHigh-StrengthGradeExtra High-StrengthGrade18(3.18)70.041(1.04)32(48).540(2.402)910(4.048)1 330(5.916)1 830(8.140)532(3.97)70.052(1.32)51(76).870(3.870)1 470(6.539)2 140(9.519)2 940(13.078)316(4.76)70.062(1.57)73(109).1 150(5.115)1 900(8.452)2 850(12.677)3 990(17.748)316(4.76)70.065(1.65)80(119)2 400(10.676)(1)B.732(5.56)30.104(2.64)88(131).1 400(6.228)2 340(10.409)3 500(15.569