1、Designation: A 741 98 (Reapproved 2009)1Standard Specification forZinc-Coated Steel Wire Rope and Fittings for HighwayGuardrail1This standard is issued under the fixed designation A 741; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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.1NOTEReapproved with editorial changes in May 2009.1. Scope1.1 This specification covers34 and 1-in. (19 and 25-mm
3、)zinc-coated steel wire rope and fittings for use in the construc-tion 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 st
4、andard.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 123/A 123M Specification for Zinc (Hot-Dip Galva-nized) Coatings on Iron and Steel ProductsA 153/A 153M Specification for Zinc Coating (Hot-
5、Dip) onIron and Steel HardwareA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for Zinc3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology A 902.
6、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 of zinc coating required (Table 1),4.1.4 Quantity of wire rope and length per reel, and4.1.5 ASTM
7、 designation and year of issue.NOTE 1A typical ordering description is as follows:34-in. (19-mm)diameter, Zinc-Coated Wire Rope for Guardrail, Type 1 Construction,Class A Coating, 80 000 lineal ft (24 300 m) on forty 2000-ft (608-m)reels, ASTM A 741 .5. Material5.1 Base MetalThe base metal shall be
8、steel made by anyprocess and shall be of such quality that the finished wire ropeand the individual zinc-coated wires shall have the propertiesas prescribed in this specification.5.2 ZincThe slab zinc when used for the coating shall beany grade of zinc conforming to Specification B6.6. Mechanical Re
9、quirements Mechanical Requirements6.1 Breaking StrengthThe zinc-coated steel wire ropeshall conform to the mechanical properties in Table 2 whentested in accordance with Test Methods and Definitions A 370and employing a suitable gripping device as covered inSupplement VII of Test Methods and Definit
10、ions A 370.6.2 ConstructionThe zinc-coated wire rope and indi-vidual wires shall conform to the dimension and constructionrequirements of Table 2.6.3 Ductility of SteelThe individual zinc-coated wiresshall be capable of being wrapped two turns in a close helix ata rate not exceeding 15 turns per min
11、ute 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 CoatingThe class of zinc coating shallbe specified by the purchaser. The weight of the zinc coating onthe individual wires for the specifi
12、ed class and appropriate wiresize shall not be less than that specified in Table 1 when testedin accordance with the stripping test of Test Method A 90 /A90M.6.5 Adherence of CoatingThe individual zinc-coatedwires shall be capable of being wrapped two turns in a closehelix at a rate not exceeding 15
13、 turns per minute around acylindrical steel mandrel equal to three times the nominaldiameter of the wire under test without the coating cracking or1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommi
14、ttee A05.12 on Wire Specifications.Current edition approved May 1, 2009. Published August 2009. Originallyapproved in 1976. Last previous edition approved in 2003 as A 741 98(2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.or
15、g. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.flaking to such an extent that any zinc can be removed byrubbing
16、with bare fingers. Loosening or detachment during theadherence test of superficial small particles of zinc formed bymechanical polishing of the surface of zinc-coated wire shallnot be considered cause for rejection.6.6 AppearanceThe individual wires shall be cylindricalin form, of uniform quality, a
17、nd 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 2. A right lay isdefined as a clockwise twist away from the o
18、bserver. 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 brazed-lap type. Joints mad
19、e 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 metal.All joints shall be
20、recoated after welding so that the joints shallhave protection from corrosion equivalent to the zinc-coatedwire 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 eachl
21、ot.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.9.3 A minimum of four wire test specimens shall be cutfrom each size of
22、main wires in the rope, selected at random fortesting 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 reel
23、s in the lot. If failure occurs in either ofthese tests, 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 b
24、e made at the place ofmanufacture unless otherwise 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
25、is in accordance with this speci-fication. When specified, 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 zinc-coated wire rope after fabrication.11. Packaging11.1 Curr
26、ent standard practice is to ship the wire rope 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 o
27、n the reel. The wooden reel shall be mountable so thatit will revolve and the rope will run off by pulling straightahead.TABLE 1 Minimum Weight of CoatingNominal Diameter of Coated WireWeight of Zinc Coating, minoz/ft2of Uncoated Wire Surface g/m2of Uncoated Wire Surfacein. mmClass ACoatingClass BCo
28、atingClass 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 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
29、.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 778TABLE 2 Guard Cable RequirementsTypeDiameter,min, in.(mm)Construction (No.of Strands 3 No. ofWires per Strand)BreakingStrength, min,lbf (kN)Len
30、gth 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)CCvariableII(a)34 (19) 6by19Awire strand core 42 800 (190) variableI
31、II 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.A 741 98 (2009)1212. Fittings12.1 The fittings shall be of the design calle
32、d 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 A 123/A 123M orA 153/A 153M, whichever applies.13. Keywords13.1 galvanized wire; steel wire; wire; zi
33、nc-coated carbonsteel 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 are expressly advised that determination of the validity of any such patent rights, and the riskof infrin
34、gement 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 revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard
35、 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 you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views
36、 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,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).A 741 98 (2009)13
