1、Designation: A925 03 (Reapproved 2014)Standard Specification forZinc-5 % Aluminum-Mischmetal Alloy-Coated SteelOverhead Ground Wire Strand1This standard is issued under the fixed designation A925; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the 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 concen
3、tric lay steel wire strandcomposed of three wires or seven wires with Class A, Class B,or Class C zinc-5 % aluminum-mischmetal (Zn-5 Al-MM)alloy coatings specifically intended for use as overhead groundwires or static wires for electric power transmission lines.1.2 The values stated in inch-pound un
4、its are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Z
5、inc or Zinc-Alloy CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE27 Method for Spectrographic Analysis of Zinc and ZincAlloys by the Solution-Residue Technique (Withdrawn1985)3E
6、47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys (Withdrawn 1997)32.2 Other Standard:4GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in Galfan Alloy (5-Al-0.04 %La-0.04 % Ce-Bal SHG Zn)3. Terminology3.1 DefinitionsFor definitions of terms used in this sp
7、eci-fication 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 grade of strand (Table 1),4.1.3 Class of Zn-5 Al-MM alloy coating (Section 11 andTable 2), and4.1.4
8、 ASTM designation and year of issue.5. Materials and Manufacture5.1 Base MetalThe base metal shall be steel made by anycommercially accepted steel making process and of suchquality and purity that, when drawn to the size of wire specifiedand coated with Zn-5 Al-MM alloy, the finished strand and thei
9、ndividual wires shall be of uniform quality and have theproperties and characteristics as prescribed in this specifica-tion.5.2 Coating Bath AnalysisThe bath metal used in continu-ous hot-dip Zn-5 Al-MM alloy coating shall meet the chemicalcomposition limits specified in Specification B750.5.2.1 For
10、 a two-step coating operation where the firstcoating is zinc (hot-dip galvanized or electrogalvanized) thefinal bath may have an aluminum content of up to 7.2 %, toprevent depletion of the aluminum content of the bath.5.2.2 Method of AnalysisThe determination of chemicalcomposition shall be made in
11、accordance with suitable chemi-cal (see Test Method E47), spectrochemical (see Method E27),or other methods. In case of dispute, the results secured by TestMethod E47 shall be the basis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium and lantha
12、num in a Zn-5Al-MM alloy has been established by the International LeadZinc Research Organization (Standard Practice GF-1).6. Stranding6.1 The strand shall 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 tw
13、ist away from the1This 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 August 2014. Originallyapproved in 1994. Last
14、 previous edition approved in 2009 as A925 03 (2009)1.DOI: 10.1520/A0925-03R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page o
15、nthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from International Lead Zinc Research Organization, 292 MadisonAve., New York, NY 10017.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
16、 United States1observer. 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 bythe purchaser. Strand is preformed when the component wire
17、sare 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 breaking strength of the finished strand shall beas specified
18、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,or by the improper socketing of a specimen shall be d
19、isre-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 in accordance with 9.2, shall be not less than 5 %for the high-strength and for the516-in. (7.94-mm), three-wireutilities grades, and 4 % for the extra
20、-highstrength and for the38-in. (9.52-mm), seven-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 initial failure in the test specimen.
21、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 the testing ma
22、chine.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. Weight of Coa
23、ting11.1 The weight of Zn-5 Al-MM alloy coating shall not beless than that specified in Table 2.11.2 Weight of Coating TestThe Zn-5 Al-MM alloy coat-ing shall be tested for weight by a stripping test in accordancewith Test Method A90/A90M.12. Adherence of Coating12.1 The Zn-5Al-MM alloy coating shal
24、l adhere to the wirewithout delaminating and without being removable by rubbingwith the bare fingers after the individual wires have beenwrapped at a rate not exceeding 15 turns per minute, in a closehelix of at least two turns around a cylindrical mandrel equal tothree times the nominal diameter of
25、 the wire under test.Loosening or detachment during the adhesion tests ofsuperficial, small particles of Zn-5 Al-MM alloy formed bymechanical polishing of the surface of Zn-5 Al-MM alloy-coated wire shall not be considered cause for rejection.13. Joints and Splices13.1 There shall be no joints of an
26、y kind made in thefinished wire entering into the 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
27、strand joints or strand splices in anylength of the completed strand.14. Permissible Variations in Wire Size14.1 The diameter of the Zn-5 Al-MM alloy-coated wireforming the strand shall conform to the nominal diametershown in Table 2 within a tolerance of 60.004 in. (0.102 mm)for wire sizes 0.104 in
28、. (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).TABLE 1 Physical Properties of Zn-5 Al-MM Alloy-Coated Steel Overhead Ground Wire StrandNominal Diameter ofStrand, in. (mm)Number of Wires inStrandNominal Diameter ofCoated Wire
29、 in Strand,in. (mm)Approximate Weight ofStrand, lb/1000 ft (kg/km)Minimum Breaking Strength of Strand, lbf (kN)High-Strength GradeExtra-High-StrengthGradeUtilities Grade516 (7.94) 3 0.145 (3.68) 171 (255) . . . . . . 6500 (28.9)516 (7.94) 7 0.104 (2.64) 205 (305) 8000 (35.6) 11 200 (49.8) . . .38 (9
30、.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) . . .TABLE 2 Minimum Weights of CoatingNominal Diameterof Coated Wire,in. (mm)Minimum Weight of
31、 Coating of UncoatedWire Surface, oz/ft2(g/m2)Class A Class B Class C0.104 (2.64) 0.80 (245) 1.60 (490) 2.40 (730)0.120 (3.05) 0.85 (260) 1.70 (520) 2.55 (780)0.145 (3.68) 0.90 (275) 1.80 (550) 2.70 (825)0.165 (4.19) 0.90 (275) 1.80 (550) 2.70 (825)A925 03 (2014)215. Workmanship, Finish, and Appeara
32、nce15.1 The Zn-5Al-MM alloy-coated wire shall be uniform indiameter and shall be free from splints, scales, inequalities,flaws, and other imperfections not consistent with good com-mercial practice. The coating shall be continuous and reason-ably uniform.16. Sampling16.1 The number of samples to be
33、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 Sections 6, 8, and 9.16.3 In addition to the strand testing in 16.2, the individualwires
34、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 occurred during
35、the 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 the purchaser
36、. However, if the producermakes this election, the purchaser shall still reserve the right totest wires from the completed strand for compliance.17. Inspection17.1 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable facilities to satisfy him that thematerial is bei
37、ng 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 unnecessarily with theoperation of the works.18. Rejection18.1 In case there is a reasonable do
38、ubt 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 occursin either of these tests, the strand shall be rejected.19. Packaging and Package
39、 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 randomlengths. At least 95 % of the lengths shall be within theminimum and maximum limits show
40、n in Table 3. Not morethan 5 % of a total length ordered may be furnished in lengthsthat are below the minimum limits shown in Table 3 but whichare 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 stron
41、g tag securely fastened to itshowing the name of the material “ground wire strand,” thelength, size, grade of the strand, class of coating, ASTMspecification number (A925), and the name or mark of themanufacturer.20. Keywords20.1 coated overhead strand; zinc 5 % aluminum-mischmetal alloy-coated over
42、head 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 validity of any such patent rights, and the riskof infringement of such
43、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 comments are invited either for revision of this standard or for additio
44、nal 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 not received a fair hearing you shouldmake your views known to the A
45、STM 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 ab
46、oveaddress 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, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 3
47、Range of Strand Lengths per Reel for at Least 95 % ofthe Completed StrandNominal Diameterof Strand, in. (mm)Number of Wires inStrandLength of Strand Per Reel for at Least95 % of the Order, ft (m)Min Max516 (7.94) 3 4700 (1430) 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.A925 03 (2014)3
