1、Designation:A36303(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 year of
2、 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 wire strandcompos
3、ed 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 parentheses are mathem
4、aticalconversions 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 Metallic Coated Steel Pr
5、od-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 size,4.1.2 Size and gr
6、ade 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 purity that when drawn to th
7、e 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 shall have a left lay with a un
8、iform 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 breaking strength.7.Preforming Strand7
9、.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 Strength and Weight8.1 The approxim
10、ate 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 jaws of the testing machine,bybrea
11、king 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 specified in 9.2,shall be not less than
12、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 of the testing machine1This specification is unde
13、r 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 1952.Last previous edition approved in 2009 as A363 03(
14、2009)1.DOI:10.1520/A0363-03R14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 from the position after application of the initial load,to theposition at initial failure in the test specimen.The separation ofthe jaws of the testing machine
15、 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 the testing machine.10.Ductility of Steel10.1 The individual wires o
16、f 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 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 coatin