1、Designation: A 363 03Standard Specification forZinc-Coated (Galvanized) Steel Overhead Ground WireStrand1This standard is issued under the fixed designation A 363; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers high-strength, extra-high-strength, and utilities grades of concentric lay steel wire strandcompo
3、sed of three wires or seven wires with Class A, Class B,or Class C zinc coatings specifically intended for use asoverhead ground wires or static wires for electric powertransmission lines.1.2 The values stated in inch-pound units are to be regardedas the standard. The SI units given in brackets are
4、forinformation only.2. Referenced Documents2.1 ASTM Standards:A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 902 Terminology Relating to Metallic-Coated Steel Prod-uctsB 6 Specification for Zinc3. Terminology3.1 DefinitionsFor definition
5、s of terms used in thisspecification, refer to Terminology A 902.4. Ordering Information4.1 Orders for strand purchased under this specificationshall include the following information:4.1.1 Quantity of each size,4.1.2 Size and grade of strand (Table 1), and4.1.3 Class of zinc coating (Section 11 and
6、 Table 2).4.1.4 ASTM designation and year of issue.5. Materials and Manufacture5.1 The base metal shall be steel produced by any commer-cially accepted steel making process and shall be of suchquality and purity that when drawn to the size of wire specifiedand coated with zinc, the finished strand w
7、ill have theproperties and characteristics prescribed in this specification.5.2 The slab zinc when used for the coating shall be anygrade of zinc conforming to Specification B 6.6. Stranding6.1 The strand shall have a left lay with a uniform pitch ofnot more than 16 times the nominal diameter of the
8、 strand. Aleft lay is defined as a counter-clockwise twist away from theobserver. Stranding shall be sufficiently close to ensure nosignificant reduction in diameter when stressed to 10 % of theminimum breaking strength.7. Preforming Strand7.1 Preformed strand shall be supplied when so specified byt
9、he purchaser. Strand is preformed when the component wiresare set to the helical form which they assume in the product byany means of process other than by merely laying them aboutthe strand core.8. Breaking Strength and Weight8.1 The approximate weight per unit length of strand andthe minimum break
10、ing strength of the finished strand shall beas specified in Table 1.8.2 A test in which the breaking strength is below theminimum specified and which may have been caused by theslipping of the specimen in the jaws of the testing machine, bybreaking within the jaws or within 1 in. 25.4 mm of the jaws
11、,or by the improper socketing of a specimen shall be disre-garded and another sample from the same coil or reel shall betested.9. Elongation9.1 The elongation of the strand in 24 in. 610 mm,determined as specified in 9.2, shall be not less than 5 % for thehigh-strength and for the516-in. 7.94-mm, 3-
12、wire utilitiesgrades, and 4 % for the extra-high-strength and for the “-in.9.52-mm, 7-wire Utilities grades.9.2 The elongation shall be measured as the percentageincrease in separation between the jaws of the testing machinefrom the position after application of the initial load, to theposition at i
13、nitial failure in the test specimen. The separation of1This 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 approved October 1, 2003. Published Decemb
14、er 2003. Originallyapproved in 1952. Last previous edition approved in 1998 as A 363 98.1*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.the jaws of the testing machine
15、 shall be approximately 2 ft0.61 m when under an initial load equal to 10 % of therequired minimum breaking strength of the strand. The elon-gation values shall be recorded only for specimens that breakover 1 in. 25.4 mm from jaws of the testing machine.10. Ductility of Steel10.1 The individual wire
16、s of the completed strand shall notfracture when wrapped at a rate not exceeding 15 turns perminute in a close helix of at least two turns around a cylindricalmandrel equal to three times the nominal diameter of the wireunder test.11. Weight of Coating11.1 The weight of zinc coating shall not be les
17、s than thatspecified in Table 2.11.2 Weight of Coating TestThe zinc coating shall betested for weight by a stripping test in accordance with TestMethod A 90/A 90M.12. Adherence of Coating12.1 The zinc coating shall adhere to the wire withoutdelaminating and without being removable by rubbing with th
18、ebare fingers after the individual wires have been wrapped at arate not exceeding 15 turns per minute, in a close helix of atleast two turns around a cylindrical mandrel equal to threetimes the nominal diameter of the wire under test. Loosening ordetachment during the adhesion tests of superficial,
19、smallparticles of zinc formed by mechanical polishing of the surfaceof zinc-coated wire shall not be considered cause for rejection.13. Joints and Splices13.1 There shall be no joints of any kind made in thefinished wire entering into the construction of the strand.13.2 Electric-welded butt joints m
20、ade prior to the start ofcold drawing of the wire are permitted; however, no electric-welded butt joints of the wire shall be made during the colddrawing application.13.3 There shall be no strand joints or strand splices in anylength of the completed strand.14. Permissible Variations in Wire Size14.
21、1 The diameter of the zinc-coated wire forming thestrand shall conform to the nominal diameter shown in Table 1within a tolerance of 60.004 in. 0.102 mm for Wire Sizes0.104 in. 2.642 mm and 0.120 in. 3.048 mm and 60.005 in.0.127 mm for Wire Sizes 0.145 in. 3.683 mm and 0.165 in.4.191 mm.15. Workmans
22、hip, Finish, and Appearance15.1 The zinc-coated wire shall be uniform in diameter andshall be free from splints, scales, inequalities, flaws, and otherimperfections not consistent with good commercial practice.The coating shall be continuous and reasonably uniform.16. Sampling16.1 The number of samp
23、les to be taken shall be determinedby lot size as follows:Lot Size Number of Samples1 to 3 reels 1 from each reel4 to 30 reels 3 min31 reels or greater 4 min16.2 Each sample taken shall be subjected to all testsprescribed in Sections 6, 8, and 9.16.3 In addition to the strand testing in 16.2 the ind
24、ividualwires from the strand samples shall be tested for compliancewith Sections 10, 11, 12, and 14. Select all three wires inthree-wire strand, and four of the wires in seven-wire strand.Individual wire samples selected for compliance to Section 14shall be discarded if any distortion of the wire oc
25、curred duringthe stranding operation.16.4 Instead of testing the wires from the completed strandin accordance with 16.3, the producer may elect to establishcompliance with Sections 10, 11, 12, and 14 of this specifica-tion by tests made on the wires prior to stranding, unlessotherwise stipulated by
26、the purchaser. However, if the producermakes this election, the purchaser shall still reserve the right totest wires from the completed strand for compliance.TABLE 1 Physical Properties of Zinc-Coated Steel Overhead Ground Wire StrandNominal Diameterof Strand,in. mmNumber ofWires inStrandNominal Dia
27、meterof Coated Wirein Strand,in. mmAApproximateWeight of Strand,lb/1000 ft kg/kmMinimum Breaking Strength of Strand, lbf kNHigh-Strength Grade Extra-High-Strength Grade Utilities Grade516 7.94 3 0.145 3.68 171 255 . . . . . . 6500 28.9516 7.94 7 0.104 2.64 205 305 8000 35.6 11 200 49.8 . . .38 9.52
28、7 0.120 3.05 273 407 10 800 48.0 15 400 68.4 11 500 51.2716 11.11 7 0.145 3.68 399 595 14 500 64.5 20 800 92.5 . . .12 12.7 7 0.165 4.19 517 770 18 800 83.6 26 900 119.6 . . .AIt is recognized that the surfaces of heavy zinc coating, particularly those produced by hot galvanizing, are not perfectly
29、smooth and devoid of irregularities. If thetolerances shown above are rigidly applied to such irregularities that are inherent to the product, unjustified rejections of wire that would actually be satisfactory for usecould occur. Therefore, it is intended that these tolerances be used in gaging the
30、uniform areas of the galvanized wire.TABLE 2 Minimum Weights of CoatingNominal Diameterof Coated Wire,in. mmMinimum Weight of Coating, oz/ft2kg/m2 of Uncoated WireSurfaceClass A Class B Class C0.104 2.64 0.80 0.24 1.60 0.49 2.40 0.730.120 3.05 0.85 0.26 1.70 0.52 2.55 0.780.145 3.68 0.90 0.27 1.80 0
31、.55 2.70 0.820.165 4.19 0.90 0.27 1.80 0.55 2.70 0.82A36303217. Inspection17.1 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable facilities to satisfy him that thematerial is being furnished in accordance with this specifica-tion. All tests and inspection shall b
32、e made on the finishedstrand at the place of manufacture prior to shipment and shallbe so conducted as not to interfere unnecessarily with theoperation of the works.18. Rejection18.1 In case there is a reasonable doubt in the first trial as tothe failure of the wire or strand to meet any requirement
33、 of thisspecification, two additional tests shall be made on samples ofwire or strand from the same coil or reel, and if failure occursin either of these tests, the strand shall be rejected.19. Packaging and Package Marking19.1 The completed strand shall be furnished on reelssufficiently sturdy to w
34、ithstand normal service incident toshipping, hauling, and field erection.19.2 The completed strand shall be furnished in randomlengths. At least 95 % of the lengths shall be within theminimum and maximum limits shown in Table 3. Not morethan 5 % of a total length ordered may be furnished in lengthsw
35、hich are below the minimum limits shown in Table 3 butwhich are not less than 1500 ft 457 m long. Each reel shall beclearly marked to show the length of the strand containedthereon.19.3 Each reel shall have a strong tag securely fastened to itshowing the name of the material “ground wire strand,” th
36、elength, size, grade of the strand, class of coating, ASTMSpecification A 363, and the name or mark of the manufacturer.20. Keywords20.1 coated overhead strand; steel wire strand; zinc-coatedoverhead strandSUMMARY OF CHANGESCommittee A05 has identified the location of selected changes to this standa
37、rd since the last issue (A 363 - 98)that may impact the use of this standard.A 363 - 03:(1) Renumbered sections to meet Form or through the ASTM website(www.astm.org).TABLE 3 Range of Strand Lengths per Reel for at Least 95 % ofthe Completed StrandNominal Diameterof Strand,in. mmNumber ofWires inStr
38、andLength in Feet metres of Strand PerReel for at Least 95 % of the OrderMin Max516 7.94 3 4700 1430 7900 2410516 7.94 7 4800 1460 7700 2350A38 9.52 7 3600 1100 5800 1770A716 11.11 7 4700 1430 7900 241012 12.7 7 3600 1100 6100 1860APurchasers may procure maximum lengths up to 12 000 ft 3660 m for516-in.7.94-mm diameter strand and up to 9400 ft 2860 m for38-in. 9.52-mm diameterstrand.A363033
