1、Designation: A741 11Standard 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 l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers34 and 1-in. (19 and 25-mm)metallic-coated steel wire rope and fittings for use in theconstru
3、ction 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 M
4、ethod 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 Mecha
5、nical Testingof Steel ProductsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for ZincB750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, r
6、efer 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 % Alum
7、inum-Mischmetal Alloy (seeTable 2),4.1.4 Quantity of wire 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 (
8、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 ZincThe sl
9、ab zinc or Zinc-5 % Aluminum-Mischmetal Alloy 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-
10、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
11、 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 cap
12、able 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 c
13、lass of metallic coating weight shallbe specified by the purchaser. The weight of the metallic1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition ap
14、proved Nov. 1, 2011. Published November 2011. Originallyapproved in 1976. Last previous edition approved in 2009 as A741 98(2009)1.DOI: 10.1520/A0741-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSt
15、andards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.coating on the individual w
16、ires 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 close
17、helix 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.
18、 Loosening or detachment during the adherence test ofsuperficial small particles of zinc or Zinc-5 % Aluminum-Mischmetal Alloy formed by mechanical polishing of thesurface of metallic-coated wire shall not be considered causefor rejection.6.6 AppearanceThe individual wires shall be cylindricalin for
19、m, of uniform quality, and free of imperfections notconsistent with good commercial practice. The coating shall becontinuous and 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 clockwi
20、se twist away from the observer. The typeof construction shall be specified by the purchaser.8. Joints and Splices8.1 Individual 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 bra
21、zed-lap type. Joints made by butt welding shall have allflash removed. When the brazed-lap type of joint is used, thelength 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 me
22、tal.All joints shall be recoated after welding so that the joints shallhave protection from corrosion equivalent 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 speci
23、men shall be taken from eachlot.Alot shall consist of not more than 20 tons (18 metric tons)of wire rope of one 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.TABLE 1 Minimum Weight of Coating for ZincN
24、ominal 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 1.20 122 244 3660.062 to 0.079, incl 1.58 to
25、 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 3.61, incl 0.85 1.70 2.55 259 518 7
26、78TABLE 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 1CoatingClass ACoatingClass BCoatingClass
27、 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 0.30 214 427 920.104 to 0.119, incl 2.64 to 3.
28、02, incl 0.80 1.60 0.40 244 488 1220.120 to 0.142, incl 3.05 to 3.61, incl 0.80 1.70 0.40 259 518 122TABLE 3 Guard Cable RequirementsTypeDiameter,min, in.(mm)Construction (No.of Strands 3 No. ofWires per Strand)BreakingStrength, min,lbf (kN)Length of Layof Strand, max,in. (mm)Length of Lay ofWires i
29、n 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)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 t
30、o 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 1129.3 A minimum of four wire test specimens shall be cutfrom each size of main wires in the rope, selected at random fortesti
31、ng for compliance with 6.2, 6.3, 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 t
32、ests, the lot of wire rope shall 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
33、specified and shall be so con-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 spe
34、cified, inspection may be waived 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
35、 onwooden reels. Each reel shall have the length, nominal diam-eter, type of strand construction, weight of rope, and name ortrademark of the manufacturer plainly and indelibly marked ona strong tag, firmly attached, or this information shall bepainted on the reel. The wooden reel shall be mountable
36、 so thatit will revolve and the 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 zi
37、nc conforming to Specifications A123/A123M orA153/A153M, whichever applies.13. Keywords13.1 galvanized wire; steel wire; wire; metallic-coated car-bon steel wireSUMMARY OF CHANGESCommittee A05 has identified the location of selected changes to this standard since the last issue(A741 98(2009)1) that
38、may impact the use of this standard. (November 1, 2011)(1) Added Zinc-5 %Aluminum-MischmetalAlloy coated wireas an alternative wire choice.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this s
39、tandard are 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
40、andif not 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
41、, which you 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 19428-2
42、959,United 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 ASTM website (www.astm.org/COPYRIGHT/).A741 113
