ASTM A925-2003(2009)e1 Standard Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Overhead Ground Wire Strand《地面架空线用锌-5%铝-铈合金涂覆钢绞线的标准规范》.pdf
《ASTM A925-2003(2009)e1 Standard Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Overhead Ground Wire Strand《地面架空线用锌-5%铝-铈合金涂覆钢绞线的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A925-2003(2009)e1 Standard Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Overhead Ground Wire Strand《地面架空线用锌-5%铝-铈合金涂覆钢绞线的标准规范》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 925 03 (Reapproved 2009)1Standard Specification forZinc-5 % Aluminum-Mischmetal Alloy-Coated SteelOverhead Ground Wire Strand1This standard is issued under the fixed designation A 925; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase 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.1NOTEReapproved with editorial changes in May 2009.1. Scope1.1 This specification covers high-strengt
3、h, extra-high-strength, and utilities grades of concentric 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 tra
4、nsmission lines.1.2 The values stated in inch-pound units 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:2A 90/A 90M Test Method for
5、 Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 902 Terminology Relating to Metallic Coated Steel Prod-uctsB 750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE27 Method for Spectrographic Analysis of Zinc and Zinc
6、Alloys by the Solution-Residue Technique3E47 Test Method for Chemical Analysis of Zinc Die-Casting Alloys32.2 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
7、of terms used in this speci-fication 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),4.1.3 Class of Zn-5 Al-MM alloy coating (Section
8、 11 andTable 2), and4.1.4 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
9、 finished strand and theindividual wires shall be of uniform quality and have theproperties and characteristics as prescribed in this specifica-tion.1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcom
10、mittee A05.12 on Wire Specifications.Current edition approved May 1, 2009. Published August 2009. Originallyapproved in 1994. Last previous edition approved in 2003 as A 925 - 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org.
11、 For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from International Lead Zinc Research Organization, 292 MadisonAve., New York, NY 10017.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
12、Conshohocken, PA 19428-2959, United States.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 B 750.5.2.1 For a two-step coating operation where the firstcoating is zinc (hot-dip galvanized
13、 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 accordance with suitable chemi-cal (see Test Method E47), spectrochemical (see M
14、ethodE27), or other methods. In case of dispute, the results securedby Test Method E47shall be the basis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium and lanthanum in a Zn-5Al-MM alloy has been established by the International LeadZinc Resea
15、rch 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 twist away from theobserver. Stranding shall be sufficiently close to ensure nosign
16、ificant 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 wiresare set to the helical form which they assume in the product byany means of pr
17、ocess 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 in Table 1.8.2 A test in which the breaking strength is below theminimum specif
18、ied 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 disre-garded and another sample from the same coil or reel shall betested.9. Elo
19、ngation9.1 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-highstrength and for the38-in. (9.52-mm), seven-wire utilities grades.9.2 The
20、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. The separation ofthe jaws of the testing machine shall be approximately 2 ft(0.
21、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 of the completed strand s
22、hall 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 Zn-5 Al-MM alloy coating shall not beless than that spec
23、ified 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 A 90/A 90M.12. Adherence of Coating12.1 The Zn-5Al-MM alloy coating shall adhere to the wirewithout delaminating and without being removable by rubbi
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