ASTM A741–98

Designation: A 741 – 98 Standard Specification for Zinc-Coated Steel Wire Rope and Fittings for Highway Guardrail1 This standard is issued under the fixed designation A 741; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 This specification covers 3⁄4 and 1-in. (19 and 25-mm) 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 regarded as the standard. The values given in parentheses are for information only. 2. Referenced Documents 2.1 ASTM Standards: A 90/A 90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings.2 A 123/A 123M Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products2 A 153/A 153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware2 A 370 Test Methods and Definitions for Mechanical Testing of Steel Products3 A 902 Terminology Relating to Metallic Coated Steel Prod- ucts2 B 6 Specification for Zinc4 3. Terminology 3.1 Definitions—For definitions of terms used in this speci- fication, refer to Terminology A 902. 4. Ordering Information 4.1 Orders for wire rope guardrail material purchased to this specification 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, and 4.1.5 ASTM designation and year of issue. NOTE 1—A typical ordering description is as follows: 3⁄4 -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 2 000-ft (608-m) reels, ASTM A 741– . 5. Material 5.1 Base Metal—The base metal shall be steel made by any process and shall be of such quality that the finished wire rope and the individual zinc-coated wires shall have the properties as prescribed in this specification. 5.2 Zinc—The slab zinc when used for the coating shall be any grade of zinc conforming to Specification B 6. 6. Mechanical Requirements 6.1 Breaking Strength—The zinc-coated steel wire rope shall conform to the mechanical properties in Table 2 when tested in accordance with Test Methods and Definitions A 370 and employing a suitable gripping device as covered in Supplement VII of Test Methods and Definitions A 370. 6.2 Construction—The zinc-coated wire rope and indi- vidual wires shall conform to the dimension and construction requirements of Table 2. 6.3 Ductility of Steel—The individual zinc-coated wires shall be capable of being wrapped two turns in a close helix at a rate not exceeding 15 turns per minute around a cylindrical steel mandrel equal to three times the nominal diameter of the wire under test without cracking or breaking of the wire. 6.4 Weight of Zinc Coating—The class of zinc coating shall be specified by the purchaser. The weight of the zinc coating on the individual wires for the specified class and appropriate wire size shall not be less than that specified in Table 1 when tested in accordance with the stripping test of Test Method A 90 /A 90M. 6.5 Adherence of Coating—The individual zinc-coated wires shall be capable of being wrapped two turns in a close helix at a rate not exceeding 15 turns per minute around a cylindrical steel mandrel equal to three times the nominal diameter of the wire under test without the coating cracking or flaking to such an extent that any zinc can be removed by rubbing with bare fingers. Loosening or detachment during the adherence test of superficial small particles of zinc formed by mechanical polishing of the surface of zinc-coated wire shall not be considered cause for rejection. 1 This specification is under the jurisdiction of ASTM Committee A-5 on Metallic Coated Iron and Steel Products and is the direct responsibility of Subcommittee A05.12 on Wire Specifications. Current edition approved April 10, 1998. Published October 1998. Originally published as A 741 – 76. Last previous edition A 741 – 96. 2 Annual Book of ASTM Standards, Vol 01.06. 3 Annual Book of ASTM Standards, Vol 01.03. 4 Annual Book of ASTM Standards, Vol 02.04. 1 Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States. NOTICE: This standard has either been superceded and replaced by a new version or discontinued. Contact ASTM International (www.astm.org) for the latest information. 6.6 Appearance—The individual wires shall be cylindrical in form, of uniform quality, and free of imperfections not consistent with good commercial practice. The coating shall be continuous and reasonably uniform. 7. Wire Rope 7.1 The wire rope shall be right regular lay, preformed, and of the type of construction shown in Table 2. A right lay is defined as a clockwise twist away from the observer. The type of construction shall be specified by the purchaser. 8. Joints and Splices 8.1 Individual Wires—The distance between joints in any two individual wires in a strand shall be not less than 18 in. (460 mm). Joints in individual wires shall be either butt-welded or brazed-lap type. Joints made by butt welding shall have all flash removed. When the brazed-lap type of joint is used, the length of the lap shall be not less than three times the diameter of 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 shall have protection from corrosion equivalent to the zinc-coated wire itself. 8.2 Strand or Rope—Strand or rope splices may only be made when authorized in writing by the purchaser. 9. Sampling and Testing 9.1 One wire rope test specimen shall be taken from each lot. A lot 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 perform conveniently all tests prescribed in this specification. 9.3 A minimum of four wire test specimens shall be cut from each size of main wires in the rope, selected at random for testing for compliance with 6.2, 6.3, 6.4, and 6.5. 9.4 If an individual wire or the rope fails to meet any requirements of this specification, that reel shall be rejected and two additional tests shall be made on samples of wire rope from two different reels in the lot. If failure occurs in either of these tests, the lot of wire rope shall be rejected. The lot may be resubmitted for inspection after testing every reel for the characteristic in which the specimen failed and sorting out the defective reels. 10. Inspection 10.1 All tests and inspection shall be made at the place of manufacture unless otherwise specified and shall be so con- ducted as not to interfere unnecessarily with the operation of the works. The manufacturer shall afford the inspector repre- senting the purchaser all reasonable facilities to satisfy him that the material 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 the right to test individual wires for compliance to 6.2, 6.3, 6.4, and 6.5 and the zinc-coated wire rope after fabrication. 11. Packaging 11.1 Current standard practice is to ship the wire rope on wooden reels. Each reel shall have the length, nominal diam- eter, type of strand construction, weight of rope, and name or trademark of the manufacturer plainly and indelibly marked on a strong tag, firmly attached, or this information shall be painted on the reel. The wooden reel shall be mountable so that it will revolve and the rope will run off by pulling straight ahead. 12. Fittings 12.1 The fittings shall be of the design called for in the plans and shall have the properties necessary to develop the strength of the wire rope. TABLE 1 Minimum Weight of Coating Nominal Diameter of Coated Wire Weight of Zinc Coating, min oz/ft2 of Uncoated Wire Surface g/m2 of Uncoated Wire Surface in. mm Class ACoating Class B Coating Class C Coating Class A Coating Class B Coating Class C Coating 0.040 to 0.061, incl 1.02 to 1.55, incl 0.40 0.80 1.20 122 244 366 0.062 to 0.079, incl 1.58 to 2.01, incl 0.50 1.00 1.50 152 305 458 0.080 to 0.092, incl 2.03 to 2.34, incl 0.60 1.20 1.80 183 366 549 0.093 to 0.103, incl 2.36 to 2.62, incl 0.70 1.40 2.10 214 427 640 0.104 to 0.119, incl 2.64 to 3.02, incl 0.80 1.60 2.40 244 488 732 0.120 to 0.142, incl 3.05 to 3.61, incl 0.85 1.70 2.55 259 518 778 TABLE 2 Guard Cable Requirements Type Diameter, min, in. (mm) Construction (No. of Strands 3 No. of Wires per Strand) Breaking Strength, min, lbf(kN) Length of Lay of Strand, max, in. (mm) Length of Lay of Wires in Strand, max, in. (mm) Diameter of Coated Wires in Strand, in. (mm) I 3⁄4 (19) 3 by 7 25 000 (110) 7.5 (190) 4.5 (114) 0.117 to 0.124 (2.97 to 3.15) II 3⁄4 (19) 6 by 19A IWRCB 42 800 (190) C C variable II(a) 3⁄4 (19) 6 by 19A wire strand core 42 800 (190) C C variable III 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 2 NOTICE: This standard has either been superceded and replaced by a new version or discontinued. Contact ASTM International (www.astm.org) for the latest information. 12.2 Fittings as shown in the plans shall have a uniform coating of zinc conforming to Specifications A 123/A 123M or A 153/A 153M, whichever applies. 13. Keywords 13.1 galvinized wire; steel wire; wire; zinc-coated carbon steel wire ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of 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 and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make 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, United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website (www.astm.org). A 741 – 98 3 NOTICE: This standard has either been superceded and replaced by a new version or discontinued. Contact ASTM International (www.astm.org) for the latest information. 主营业务范围：ASTMASTMASTMASTM、NASNASNASNAS、NASMNASMNASMNASM、MILMILMILMIL、ISOISOISOISO、ENENENEN、 DINDINDINDIN、JISJISJISJIS等技术标准翻译；技术资料翻译；NADCAPNADCAPNADCAPNADCAP认证 标准资料翻译；国外技术标准中文版优惠低价代购等。 业务 QQQQQQQQ：2298175560229817556022981755602298175560 专业 专注于技术翻译 诚信 实惠 物超所值的服务可靠的质量保证