ASTM_A_741_-_11_2016.pdf

Designation:A74111(Reapproved 2016)Standard Specification forMetallic-Coated Steel Wire Rope and Fittings for HighwayGuardrail1This standard is issued under the fixed designation A741;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 covers34and 1-in.(19 and 25-mm)metallic-coated steel wire rope and fittings for use in theconstruction of highway guardrail.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 CoatingsA123/A123M Specification for Zinc(Hot-Dip Galvanized)Coatings on Iron and Steel ProductsA153/A153M Specification for Zinc Coating(Hot-Dip)onIron and Steel HardwareA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for ZincB750 Specification for GALFAN3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology A902.4.Ordering Information4.1 Orders for wire rope guardrail material purchased to thisspecification shall include the following:4.1.1 Diameter of wire rope,4.1.2 Type of wire rope construction,4.1.3 Class and Type of Metallic coatingZ for zinc(seeTable 1),M for Zinc-5%Aluminum-Mischmetal Alloy(seeTable 2),4.1.4 Quantity of wire rope and length per reel,and4.1.5 ASTM designation and year of issue.NOTE1A typical ordering description is as follows:34-in.(19-mm)diameter,Metallic-Coated Wire Rope for Guardrail,Type 1 Construction,Class ZA Coating,80 000 lineal ft(24 300 m)on forty 2000-ft(608-m)reels,ASTM A741.5.Material5.1 Base MetalThe base metal shall be steel made by anyprocess and shall be of such quality that the finished wire ropeand the individual metallic-coated wires shall have the prop-erties as prescribed in this specification.5.2 ZincTheslabzincorZinc-5%Aluminum-MischmetalAlloy when used for the coating shall be any gradeof zinc conforming to Specification B6 for Zinc coatings orSpecification B750 for Zinc-5%Aluminum-Mischmetal Alloycoatings.5.3 Coating Bath AnalysisThe bath metal used in continu-ous hot-dip Zn-5 Al-MM alloy-coated wire shall meet thechemical composition limits specified in Specification B750.6.Mechanical Requirements6.1 Breaking StrengthThe metallic-coated steel wire ropeshall conform to the mechanical properties in Table 3 whentested in accordance with Test Methods and Definitions A370and employing a suitable gripping device as covered inSupplement VII of Test Methods and Definitions A370.6.2 ConstructionThe metallic-coated wire rope and indi-vidual wires shall conform to the dimension and constructionrequirements of Table 3.6.3 Ductility of SteelThe individual metallic-coated wiresshall be capable of being wrapped two turns in a close helix ata rate not exceeding 15 turns per minute around a cylindricalsteel mandrel equal to three times the nominal diameter of thewire under test without cracking or breaking of the wire.6.4 Weight of Zinc Coating or Zinc-5%Aluminum-Mischmetal AlloyThe class of metallic coating weight shall1This 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 Nov.1,2016.Published November 2011.Originallyapproved in 1976.Last previous edition approved in 2011 as A741 111.DOI:10.1520/A0741-11R16.2For 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 be specified by the purchaser.The weight of the metalliccoating on the individual wires for the specified class andappropriate wire size shall not be less than that specified inTable 1 or Table 2 when tested in accordance with the strippingtest of Test Method A90/A90M.6.5 Adherence of CoatingThe individual metallic-coatedwires shall be capable of being wrapped two turns in a closehelix at a rate not exceeding 15 turns per minute around acylindrical steel mandrel equal to three times the nominaldiameter of the wire under test without the coating cracking orflaking to such an extent that any zinc or Zinc-5%Aluminum-Mischmetal Alloy can be removed by rubbing with barefingers.Loosening or detachment during the adherence test ofsuperficial small particles of zinc or Zin