1、Designation: A363 03 (Reapproved 2014)Standard Specification forZinc-Coated (Galvanized) Steel Overhead Ground WireStrand1This standard is issued under the fixed designation A363; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 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.1. Scope1.1 This specification covers high-strength, extra-high-strength, and utilities grades of concentric lay steel wi
3、re strandcomposed 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 standard. The values given in paren
4、theses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminology Relating to Metall
5、ic Coated Steel Prod-uctsB6 Specification for Zinc3. Terminology3.1 DefinitionsFor definitions of terms used in thisspecification, refer to Terminology A902.4. Ordering Information4.1 Orders for strand purchased under this specificationshall include the following information:4.1.1 Quantity of each s
6、ize,4.1.2 Size and grade of strand (Table 1), and4.1.3 Class of zinc coating (Section 11 and 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 pur
7、ity that when drawn to the size of wire specifiedand coated with zinc, the finished strand will 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 B6.6. Stranding6.1 The strand shal
8、l have a left lay with a uniform pitch ofnot more than 16 times the nominal diameter of the 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 breakin
9、g strength.7. Preforming Strand7.1 Preformed strand shall be supplied when so specified bythe 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 S
10、trength and Weight8.1 The approximate weight per unit length of strand andthe minimum breaking 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
11、jaws of the testing machine, bybreaking within the jaws or within 1 in. (25.4 mm) of the jaws,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 s
12、pecified in 9.2, shall be not less than 5 % for thehigh-strength and for the516-in. (7.94-mm), 3-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
13、of the testing machine1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Productsand is the direct responsibility of Subcom-mittee A05.12 on Wire Specifications.Current edition approved Aug. 1, 2014. Published September 2014. Originallyapproved in 19
14、52. Last previous edition approved in 2009 as A363 03 (2009)1.DOI: 10.1520/A0363-03R14.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1from the position after application of the initial load, to theposition at initial failure in the t
15、est specimen. The separation ofthe jaws of the testing machine shall be approximately 2 ft(0.61 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
16、the testing machine.10. Ductility of Steel10.1 The individual wires 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.
17、 Weight of Coating11.1 The weight of zinc coating shall not be less 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 A90/A90M.12. Adherence of Coating12.1 The zinc coating shall adhere to the wire wi
18、thoutdelaminating and without being removable by rubbing with thebare 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. L
19、oosening ordetachment during the adhesion tests of superficial, 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 t
20、he construction of the strand.13.2 Electric-welded butt joints made 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
21、 the completed strand.14. Permissible Variations in Wire Size14.1 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
22、mm) for Wire Sizes 0.145 in. (3.683 mm) and 0.165 in.(4.191 mm).15. Workmanship, 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 sh
23、all be continuous and reasonably uniform.16. Sampling16.1 The number of samples to be taken shall be determinedby lot size as follows:Lot Size Number of Samples1 to 3 reels 1 from each reel4to30reels 3min31 reels or greater 4 min16.2 Each sample taken shall be subjected to all testsprescribed in Sec
24、tions 6, 8, and 9.16.3 In addition to the strand testing in 16.2 the individualwires 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 com
25、pliance to Section 14shall be discarded if any distortion of the wire occurred 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 te
26、sts made on the wires prior to stranding, unlessotherwise stipulated by 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
27、StrandNominal Diameterof Strand,in. (mm)Number ofWires inStrandNominal Diameterof Coated Wirein Strand,in. (mm)AApproximateWeight of Strand,lb/1000 ft (kg/km)Minimum Breaking Strength of Strand, lbf (kN)High-StrengthGradeExtra-High-StrengthGradeUtilities Grade516 (7.94) 3 0.145 (3.68) 171 (255) . .
28、. . . . 6500 (28.9)516 (7.94) 7 0.104 (2.64) 205 (305) 8000 (35.6) 11 200 (49.8) . . .38 (9.52) 7 0.120 (3.05) 273 (407) 10 800 (48.0) 15 400 (68.4) 11 500 (51.2)716 (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) . .
29、.AIt is recognized that the surfaces of heavy zinc coating, particularly those produced by hot galvanizing, are not perfectly 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
30、that would actually be satisfactory for usecould occur. Therefore, it is intended that these tolerances be used in gaging the uniform areas of the galvanized wire.TABLE 2 Minimum Weights of CoatingNominal Diameterof Coated Wire,in. (mm)Minimum Weight of Coating, oz/ft2(kg/m2) of Uncoated WireSurface
31、Class A Class B Class C0.104 (2.64) 0.80 (0.24) 1.60 (0.49) 2.40 (0.73)0.120 (3.05) 0.85 (0.26) 1.70 (0.52) 2.55 (0.78)0.145 (3.68) 0.90 (0.27) 1.80 (0.55) 2.70 (0.82)0.165 (4.19) 0.90 (0.27) 1.80 (0.55) 2.70 (0.82)A363 03 (2014)217. Inspection17.1 The manufacturer shall afford the inspector represe
32、nt-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 be made on the finishedstrand at the place of manufacture prior to shipment and shallbe so conducted as not to interfere unnecessar
33、ily 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 of thisspecification, two additional tests shall be made on samples ofwire or strand from the same coil or reel, and if failure o
34、ccursin 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 withstand normal service incident toshipping, hauling, and field erection.19.2 The completed strand shall be furnished in randomlen
35、gths. 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 lengthswhich are below the minimum limits shown in Table 3 butwhich are not less than 1500 ft (457 m) long. Each reel shall beclearly mark
36、ed 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,” thelength, size, grade of the strand, class of coating, ASTMSpecification A363, and the name or mark of the manufacturer.20. Keywo
37、rds20.1 coated overhead strand; steel wire strand; zinc-coatedoverhead strandASTM 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 validi
38、ty of any such patent rights, and the riskof 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 andif not revised, either reapproved or withdrawn. Your commen
39、ts are invited either for revision of this standard 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 no
40、t received a fair hearing you shouldmake 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 cop
41、ies) 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 22
42、2Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 3 Range of Strand Lengths per Reel for at Least 95 % ofthe Completed StrandNominal Diameterof Strand,in. (mm)Number ofWires inStrandLength in Feet (metres) of Strand PerReel for at Least 95 % of the OrderMin Max516 (7.94) 3 4700 (1430)
43、7900 (2410)516 (7.94) 7 4800 (1460) 7700 (2350)A38 (9.52) 7 3600 (1100) 5800 (1770)A716 (11.11) 7 4700 (1430) 7900 (2410)12 (12.7) 7 3600 (1100) 6100 (1860)APurchasers 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)diameter strand.A363 03 (2014)3
