1、Standard Specification for Metallic-Coated Steel Wire Rope and Fittings for Highway Guardrail AASHTO Designation: M 30-151ASTM Designation: A741-111American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-4d M 30-1 AASHTO St
2、andard Specification for Metallic-Coated Steel Wire Rope and Fittings for Highway Guardrail AASHTO Designation: M 30-151 ASTM Designation: A741-1111. SCOPE 1.1. This specification covers 3/4- and 1-in. (19- and 25-mm) metallic-coated steel wire rope and fittings for use in the construction of highwa
3、y guardrail. 1.2. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 111M/M 111, Zi
4、nc (Hot-Dip Galvanized) Coatings on Iron and Steel Products M 232M/M 232, Zinc Coating (Hot-Dip) on Iron and Steel Hardware T 65M/T 65, Mass Weight of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings T 244, Mechanical Testing of Steel Products 2.2. ASTM Standards: A902, Standard T
5、erminology Relating to Metallic Coated Steel Products B6-07, Standard Specification for Zinc B750, Standard Specification for GALFAN (Zinc-5% Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings 3. TERMINOLOGY 3.1. DefinitionsFor definitions of terms used in this specification, refer to AST
6、M A902. 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; 2015 by the American Association of State Highway and Transportation Officials.All rights res
7、erved. Duplication is a violation of applicable law.TS-4d M 30-2 AASHTO 4.1.3. Class and type of metallic coatingZ for zinc (see Table 2), M for zinc-5 percent aluminum-mischmetal alloy (see Table 3); 4.1.4. Quantity of wire rope and length per reel; and 4.1.5. AASHTO designation and year of issue.
8、Note 1A typical ordering description is as follows: 3/4-in. (19-mm) diameter, Metallic-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, M 30-_. 5. MATERIAL 5.1. Base MetalThe base metal shall be steel made by any proces
9、s 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. ZincThe slab zinc or zinc-5 percent aluminum-mischmetal alloy when used for the coating shall be any grade of zinc conforming to ASTM B6
10、-07 for zinc coatings or ASTM B750 for zinc-5 percent aluminum-mischmetal alloy coatings. 5.3. Coating Bath AnalysisThe bath metal used in continuous hot-dip zinc-5 percent aluminum-mischmetal alloy-coated wire shall meet the chemical composition limits specified in ASTM B750. 6. MECHANICAL REQUIREM
11、ENTS 6.1. Breaking StrengthThe zinc-coated steel wire rope shall conform to the mechanical properties given in Table 1 when tested in accordance with T 244 and employing a suitable gripping device as covered in Annex A7.3 of T 244. 6.2. ConstructionThe zinc-coated wire rope and individual wires shal
12、l conform to the dimension and construction requirements of Table 1. Table 1Guard Cable Requirements Type Diameter, min, in. (mm) Construction (No. of Strands 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. (
13、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 19aIWRCb42,800 (190) c c Variable II(a) 3/4(19) 6 by 19awire strand core 42,800 (190) c c Variable III 1 (25) 7 by 7 45,000 (200) 10 (254) 4.5 (114) 0.105
14、to 0.116 (2.67 to 2.95) a6-by-19 classification may have from 15 to 26 wires per strand. bIWRC = independent wire rope core. cLength of lay as specified by manufacturer. 6.3. Ductility of SteelThe individual zinc-coated wires shall be capable of being wrapped two turns in a close helix at a rate not
15、 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. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation
16、of applicable law.TS-4d M 30-3 AASHTO 6.4. Weight of Zinc Coating or Zinc-5 Percent Aluminum-Mischmetal AlloyThe class of zinc coating shall be specified by the purchaser. The weight of the metallic coating on the individual wires for the specified class and appropriate wire size shall not be less t
17、han that specified in Table 2 or Table 3 when tested in accordance with the stripping test of T 65M/T 65. Table 2Minimum Weight of Coating for Zinc Nominal Diameter of Coated Wire Weight of Zinc Coating, min in. mm oz/ft2 of Uncoated Wire Surface g/m2 of Uncoated Wire Surface Class A Coating Class B
18、 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
19、to 2.62, incl 0.70 1.40 2.10 214 427 641 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 2.55 259 519 778 6.5. Adherence of CoatingThe individual metallic-coated wires shall be capable of being wrapped two turns in a close helix at
20、 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 or zinc-5 percent aluminum-mischmetal alloy can be removed by rubbing with bare finger
21、s. Loosening or detachment during the adherence test of superficial small particles of zinc or zinc-5 percent aluminum-mischmetal alloy formed by mechanical polishing of the surface of metallic-coated wire shall not be considered cause for rejection. 6.6. AppearanceThe individual wires shall be cyli
22、ndrical in form, of uniform quality, and free of imperfections not consistent with good commercial practice. Each wire shall have a continuous metallic coating of reasonably uniform thickness. Table 3Minimum Weight of Coating for Zinc-5 Percent Aluminum-Mischmetal Alloy Nominal Diameter of Coated Wi
23、re Weight of Zinc-5% Aluminum-Mischmetal Alloy Coating, min in. mm oz/ft2 of Uncoated Wire Surface g/m2 of Uncoated Wire Surface Class A Coating Class B Coating Class A Coating Class B Coating 0.040 to 0.061, incl 1.02 to 1.55, incl 0.40 0.80 122 244 0.062 to 0.079, incl 1.58 to 2.01, incl 0.50 1.00
24、 152 305 0.080 to 0.092, incl 2.03 to 2.34, incl 0.60 1.20 183 366 0.093 to 0.103, incl 2.36 to 2.62, incl 0.70 1.40 214 427 0.104 to 0.119, incl 2.64 to 3.02, incl 0.80 1.60 244 488 0.120 to 0.142, incl 3.05 to 3.61, incl 0.85 1.70 259 519 7. WIRE ROPE 7.1. The wire rope shall be right regular lay,
25、 preformed, and of the type of construction shown in Table 1. A right lay is defined as a clockwise twist away from the observer. The type of construction shall be specified by the purchaser. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplicat
26、ion is a violation of applicable law.TS-4d M 30-4 AASHTO 8. JOINTS AND SPLICES 8.1. Individual WiresThe distance between joints in any two individual wires in a strand shall be not less than 457 mm (18 in.). Joints in individual wires shall be either butt-welded or brazed-lap type. Joints made by bu
27、tt 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 r
28、ecoated after welding so that the joints shall have protection from corrosion equivalent to the metallic-coated wire itself. 8.2. Strand or RopeStrand or rope splices may be made only when authorized in writing by the purchaser. 9. SAMPLING AND TESTING 9.1. One wire rope test specimen shall be taken
29、 from each lot. A lot shall consist of not more than 18 Mg (20 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 e
30、ach size of main wires in the rope, selected at random for testing for compliance with Sections 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 the wi
31、re 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 characteristics in which the specimen failed and sorting out the defective reels. 10. INSPECTION
32、 10.1. All tests and inspection shall be made at the place of manufacture unless otherwise specified and shall be so conducted as not to interfere unnecessarily with the operation of the works. The manufacturer shall afford the inspector representing the purchaser all reasonable facilities to satisf
33、y him that the material being furnished is in accordance with this specification. When specified, inspection may be waived and certified copies of test reports furnished. The purchaser reserves the right to test individual wires for compliance to Sections 6.2, 6.3, 6.4, and 6.5 and the metallic-coat
34、ed 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 diameter, type of strand construction, mass of rope, and name or trademark of the manufacturer plainly and indelibly marked on a strong tag
35、, 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
36、 to develop the strength of the wire rope. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4d M 30-5 AASHTO 12.2. Fittings as shown in the plans shall have a uniform coating of zinc conforming to M 11
37、1M/M 111 or M 232M/M 232, whichever applies. 13. KEYWORDS 13.1. Galvanized wire; steel wire; wire; metallic-coated carbon steel wire. 1In essential equivalence with ASTM A741-111except for the order of the tables. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
