1、Designation: A741 11 (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 revis
2、ion, 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 covers34 and 1-in. (19 and 25-mm)metallic-coated steel wire rope and fittings for
3、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
4、: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 Defi
5、nitions 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 Order
6、s 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
7、 rope and length per reel, and4.1.5 ASTM designation and year of issue.NOTE 1A 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. Ma
8、terial5.1 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 ZincThe slab zinc or Zinc-5 % Aluminum-Mischmetal Alloy when used f
9、or 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 spe
10、cified 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
11、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
12、 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
13、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
14、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 Internati
15、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1be 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 i
16、n 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 o
17、f 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 Zinc-5 % Aluminum-Mischmetal Alloy
18、 formed by mechanical polishing of thesurface of metallic-coated wire shall not be considered causefor rejection.6.6 AppearanceThe individual wires shall be cylindricalin form, of uniform quality, and free of imperfections notconsistent with good commercial practice. The coating shall becontinuous a
19、nd reasonably uniform.7. Wire Rope7.1 The wire rope shall be right regular lay, preformed, andof the type of construction shown in Table 3. A right lay isdefined as a clockwise twist away from the observer. The typeof construction shall be specified by the purchaser.8. Joints and Splices8.1 Individu
20、al WiresThe distance between joints in anytwo individual wires in a strand shall be not less than 18 in.(460 mm). Joints in individual wires shall be either butt-weldedor brazed-lap type. Joints made by butt welding shall have allflash removed. When the brazed-lap type of joint is used, theTABLE 1 M
21、inimum Weight of Coating for ZincNominal Diameter of Coated WireWeight of Zinc Coating, minoz/ft2of Uncoated Wire Surface g/m2of Uncoated Wire Surfacein. mmClass ACoatingClass BCoatingClass CCoatingClass ACoatingClass BCoatingClass CCoating0.040 to 0.061, incl 1.02 to 1.55, incl 0.40 0.80 1.20 122 2
22、44 3660.062 to 0.079, incl 1.58 to 2.01, incl 0.50 1.00 1.50 152 305 4580.080 to 0.092, incl 2.03 to 2.34, incl 0.60 1.20 1.80 183 366 5490.093 to 0.103, incl 2.36 to 2.62, incl 0.70 1.40 2.10 214 427 6400.104 to 0.119, incl 2.64 to 3.02, incl 0.80 1.60 2.40 244 488 7320.120 to 0.142, incl 3.05 to 3
23、.61, incl 0.85 1.70 2.55 259 518 778TABLE 2 Minimum Weight of Coating for Zinc-5 % Aluminum-Mischmetal AlloyNominal Diameter of Coated WireWeight of Zinc-5 %Aluminum-Mischmetal AlloyCoating, minoz/ft2of Uncoated Wire Surface g/m2of Uncoated Wire Surfacein. mmClass ACoatingClass BCoatingClass 1Coatin
24、gClass ACoatingClass BCoatingClass 1Coating0.040 to 0.061, incl 1.02 to 1.55, incl 0.40 0.80 0.20 122 244 610.062 to 0.079, incl 1.58 to 2.01, incl 0.50 1.00 0.25 152 305 760.080 to 0.092, incl 2.03 to 2.34, incl 0.60 1.20 0.30 183 366 920.093 to 0.103, incl 2.36 to 2.62, incl 0.70 1.40 0.30 214 427
25、 920.104 to 0.119, incl 2.64 to 3.02, incl 0.80 1.60 0.40 244 488 1220.120 to 0.142, incl 3.05 to 3.61, incl 0.85 1.70 0.40 259 518 122Class A Coating Weight (oz/ft2) in the 0.120 to 0.142, incl range was editorially corrected.TABLE 3 Guard Cable RequirementsTypeDiameter,min, in.(mm)Construction (No
26、.of Strands No. ofWires per Strand)BreakingStrength, min,lbf (kN)Length of Layof Strand, max,in. (mm)Length of Lay ofWires in Strand,max, in. (mm)Diameter of Coated Wires inStrand, in. (mm)I34 (19) 3 by 7 25 000 (110) 7.5 (190) 4.5 (114) 0.117 to 0.124 (2.97 to 3.15)II34 (19) 6by19AIWRCB42 800 (190)
27、CCvariableII(a)34 (19) 6by19Awire strand core 42 800 (190) variableIII 1 (25) 7 by 7 45 000 (200) 10 (254) 4.5 (114) 0.105 to 0.116 (2.67 to 2.84)A6 by 19 classification may have from 15 to 26 wires per strand.BIWRC = independent wire rope core.CLength of lay as specified by the manufacturer.A741 11
28、 (2016)2length of the lap shall be not less than three times the diameterof the wire and the overlapping faces shall be smooth, clean,properly fluxed, and completely covered by the brazing metal.All joints shall be recoated after welding so that the joints shallhave protection from corrosion equival
29、ent to the metallic-coated wire itself.8.2 Strand or RopeStrand or rope splices may only bemade when authorized in writing by the purchaser.9. Sampling and Testing9.1 One wire rope test specimen shall be taken from eachlot.Alot shall consist of not more than 20 tons (18 metric tons)of wire rope of o
30、ne size and type delivered at one time.9.2 The test specimen shall be of a length to performconveniently all tests prescribed in this specification.9.3 A minimum of four wire test specimens shall be cutfrom each size of main wires in the rope, selected at random fortesting for compliance with 6.2, 6
31、.3, 6.4, and 6.5.9.4 If an individual wire or the rope fails to meet anyrequirements of this specification, that reel shall be rejectedand two additional tests shall be made on samples of wire ropefrom two different reels in the lot. If failure occurs in either ofthese tests, the lot of wire rope sh
32、all be rejected. The lot maybe resubmitted for inspection after testing every reel for thecharacteristic in which the specimen failed and sorting out thedefective reels.10. Inspection10.1 All tests and inspection shall be made at the place ofmanufacture unless otherwise specified and shall be so con
33、-ducted as not to interfere unnecessarily with the operation ofthe works. The manufacturer shall afford the inspector repre-senting the purchaser all reasonable facilities to satisfy him thatthe material being furnished is in accordance with this speci-fication. When specified, inspection may be wai
34、ved and certi-fied copies of test reports furnished. The purchaser reserves theright to test individual wires for compliance to 6.2, 6.3, 6.4, and6.5, and the metallic-coated wire rope after fabrication.11. Packaging11.1 Current standard practice is to ship the wire rope onwooden reels. Each reel sh
35、all have the length, nominaldiameter, type of strand construction, weight of rope, and nameor trademark of the manufacturer plainly and indelibly markedon a strong tag, firmly attached, or this information shall bepainted on the reel. The wooden reel shall be mountable so thatit will revolve and the
36、 rope will run off by pulling straightahead.12. Fittings12.1 The fittings shall be of the design called for in the plansand shall have the properties necessary to develop the strengthof the wire rope.12.2 Fittings as shown in the plans shall have a uniformcoating of zinc conforming to Specifications
37、 A123/A123M orA153/A153M, whichever applies.13. Keywords13.1 galvanized wire; steel wire; wire; metallic-coated car-bon steel wireASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard a
38、re expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not
39、 revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which y
40、ou may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,Unite
41、d States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 11 (2016)3
