ASTM A741-1998(2003) Standard Specification for Zinc-Coated Steel Wire Rope and Fittings for Highway Guardrail《高速公路护栏用镀锌钢丝绳和配件的标准规范》.pdf

1、Designation: A 741 98 (Reapproved 2003)Standard 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 revisio

2、n, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers34 and 1-in. 19 and 25-mmzinc-coated steel wire rope and fittings for use in

3、the construc-tion of highway guardrail.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in brackets are for informa-tion only.2. Referenced Documents2.1 ASTM Standards:A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc o

4、r Zinc-Alloy Coatings.2A 123/A 123M Specification for Zinc (Hot-Dip Galvanized)Coatings on Iron and Steel Products2A 153/A 153M Specification for Zinc Coating (Hot-Dip) onIron and Steel Hardware2A 370 Test Methods and Definitions for Mechanical Testingof Steel Products3A 902 Terminology Relating to

5、Metallic Coated Steel Prod-ucts2B 6 Specification for Zinc43. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology A 902.4. Ordering Information4.1 Orders for wire rope guardrail material purchased to thisspecification shall include the following:4.1.1

6、 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 designation and year of issue.NOTE 1A typical ordering description is as follows:34 -in. 19-mmdiameter, Zinc-Coated Wire Rope for

7、Guardrail, Type 1 Construction,Class A Coating, 80 000 lineal ft 24 300 m on forty 2 000-ft 608-mreels, ASTM A 741 .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 zinc-coated wires shall have the pr

8、opertiesas prescribed in this specification.5.2 ZincThe slab zinc when used for the coating shall beany grade of zinc conforming to Specification B 6.6. Mechanical Requirements6.1 Breaking StrengthThe zinc-coated steel wire ropeshall conform to the mechanical properties in Table 2 whentested in acco

9、rdance with Test Methods and Definitions A 370and employing a suitable gripping device as covered inSupplement VII of Test Methods and Definitions 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 Ductilit

10、y of SteelThe individual zinc-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 Z

11、inc CoatingThe class of zinc coating shallbe specified by the purchaser. The weight of the zinc coating onthe individual wires for the specified 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.

12、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 turns per minute around acylindrical steel mandrel equal to three times the nominaldiameter of the wire under test without the coating cracking orflaking to

13、such an extent that any zinc can be removed byrubbing 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.1This specification is under th

14、e jurisdiction of ASTM Committee A05 onMetallic Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition approved April 10, 2003. Published June 2003. Originallyapproved in 1976. Last previous edition approved in 1998 as A 741 98.2A

15、nnual Book of ASTM Standards, Vol 01.06.3Annual Book of ASTM Standards, Vol 01.03.4Annual Book of ASTM Standards, Vol 02.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.6 AppearanceThe individual wires shall be cylindricalin for

16、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 2. A right lay isdefined as a clockwi

17、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 braze

18、d-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 meta

19、l.All joints shall be 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 sha

20、ll be taken from eachlot. A lot shall consist of not more than 20 tons 18 metric tonsof 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

21、 cutfrom each size of 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 ropef

22、rom two different reels 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

23、and inspection shall be 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 mat

24、erial being furnished 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.

25、11. Packaging11.1 Current 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 informa

26、tion shall bepainted on the reel. The wooden reel shall be mountable 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.T

27、ABLE 1 Minimum Weight of CoatingNominal 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 24

28、4 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.

29、61, incl 0.85 1.70 2.55 259 518 778TABLE 2 Guard Cable RequirementsTypeDiameter,min, in.mmConstruction (No.of Strands 3 No. ofWires per Strand)BreakingStrength, min,lbf kNLength of Layof Strand, max,in. mmLength of Lay ofWires in Strand,max, in. mmDiameter of Coated Wires inStrand, in. mmI34 19 3 by

30、 7 25 000 110 7.5 190 4.5 114 0.117 to 0.124 2.97 to 3.15II34 19 6 by 19AIWRCB42 800 190CCvariableII(a)34 19 6 by 19Awire 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 2.84A6 by 19 classification may have from 15 to 26 wires per strand.BIWRC = indepe

31、ndent wire rope core.CLength of lay as specified by the manufacturer.A 741 98 (2003)212.2 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; zinc-coated car

32、bonsteel 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 infringement of suc

33、h 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 or for addit

34、ional 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 known to the

35、 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 (2003)3