1、Designation: B 498/B 498M 08Standard Specification forZinc-Coated (Galvanized) Steel Core Wire for Use inOverhead Electrical Conductors1This standard is issued under the fixed designation B 498/B 498M; the number immediately following the designation indicates the yearof original adoption or, in the
2、 case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers round, zinc-coated, steel corewire with two classes of zinc
3、coating for use in overheadelectrical conductors.1.2 This specification covers wire of diameter from 0.0500to 0.1900 in. or 1.27 to 4.82 mm, inclusive.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exa
4、ct equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.2. Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification
5、to theextent referenced herein.2.2 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 751 Test Methods, Practices, and Terminology forChemical Analysis
6、 of Steel ProductsB6 Specification for ZincB 193 Test Method for Resistivity of Electrical ConductorMaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Terminology3.1 Definition:3.1.1 lotunless otherwise specified in the contract ororder, a l
7、ot shall consist of all coils of wire of the samediameter and unit lengths submitted for inspection at the sametime.3.1.2 Product CodeDefines product coating type, coatingclass and strength grade. Two product codes for productproduced to this specification: Class A Zinc Coated (CodeGA2); and Class C
8、 Zinc Coated (Code GC2).4. Classification4.1 The wire is furnished in two classes of coating, Class Aor Class C, as specified, in conformance with the requirementsof Section 10 and Table 6 or Table 7.5. Ordering Information5.1 Orders for material under this specification shall includethe following i
9、nformation:5.1.1 Quantity of each size,5.1.2 Wire diameter in inches or millimeters (Section 14),5.1.3 Product Code (see 3.1.2 and 4.1),5.1.4 Certification, if required (Section 19),5.1.5 Test report, if required (Section 19), and5.1.6 Package size (Section 20).5.1.7 Order Example: Five multiple len
10、gths of 12 000 ft.each, 0.1327 in. GA2 wire, packaged onto wooden nonreturn-able reels, with certified test report.6. Materials and Manufacture6.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or basic-oxygen process.6.2 The wire shall be cold drawn and coated with zin
11、c toproduce the desired properties.6.3 The slab zinc used for coating shall be high-grade orbetter, conforming to Specification B6.7. Chemical Composition7.1 The steel shall conform to the requirements prescribedin Table 1.7.2 Chemical analysis shall be conducted in accordancewith Test Methods, Prac
12、tices, and Terminology A 751.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.05 onConductors of Ferrous Metals.Current edition approved Nov. 1, 2008. Published December 2008. Originallypublished as B 498
13、 69 to replace B 245 and B 261. Last previous edition approvedin 2002 as B 498/B 498M 98 (2002).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 Docume
14、nt Summary page onthe ASTM website.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.8. Tensile Test8.1 The zinc-coated steel core wire shall conform to thetensile and e
15、longation requirements prescribed in Table 2 orTable 3.8.2 Tensile tests shall be conducted in accordance with TestMethods and Definitions A 370, using the initial settings fordetermining stress at 1 % extension given in Table 4 or Table5 of this specification.8.3 Test SpecimensThe test specimens sh
16、all be free ofbends or kinks other than the curvature resulting from the usualcoiling operations. Any hand straightening necessary to permitinsertion of the specimen in the jaws of the testing machineshall be performed by drawing between wood blocks or bysome other equally satisfactory means.9. Wrap
17、 Test9.1 The material, as represented by the test specimens, shallnot fracture when the galvanized wire is wrapped at a rate notexceeding 15 turns/min in a close helix of at least eight turnsaround a cylindrical mandrel with a diameter equal to twotimes the specified diameter of the wire under test,
18、 65%.10. Coating Test10.1 The material, as represented by the test specimens,shall conform to the coating requirements of Table 6 or Table7. for the diameter and class of coating specified.10.2 The coating test shall be conducted in accordance withTest Method A 90/A 90M.11. Adherence of Coating Test
19、11.1 The zinc-coated wire shall be capable of beingwrapped in a close helix at a rate not exceeding 15 turns/minaround a cylindrical mandrel having a diameter as prescribed inTable 8 or Table 9, without cracking or flaking the zinc coatingto such an extent that any zinc can be removed by rubbing wit
20、hthe bare fingers.NOTE 1Loosening or detachment during the adhesion test of super-ficial, small particles of Zinc formed by mechanical polishing of thesurface of the coated wire shall not be considered cause for rejection.12. Joints12.1 No joints shall be made in the finished wire.12.2 Joints may be
21、 made at any stage of processing beforefinal cold drawing by the electric butt-weld or flash-weldingprocess.12.3 Welding equipment and procedure shall be such that itcan be demonstrated that the tensile strength of a finished wirespecimen containing the welded section shall not be less than96 % of t
22、he specified minimum stress at 1 % extension.12.4 A welded section shall not be required to meet thestress at 1 % extension, elongation, and wrap tests.13. Density and Resistivity13.1 For the purposes of calculating mass per unit length,cross-sections, and so forth, the density of galvanized steelwi
23、re at 20C shall be taken as 0.281 lb/in.3(7780 kg/m3).13.2 A maximum resistivity of galvanized steel wire is notguaranteed, but a typical value of 0.191 57 Vmm2/m may beused for purposes of calculation. For conversion to other unitsof conductivity or resistivity, refer to Test Method B 193.14. Dimen
24、sions and Permissible Variations14.1 The specified diameter of the zinc-coated wire shall beexpressed in decimal fractions of an inch to four decimalplaces, or in millimeters to two decimal places.14.2 To determine the applicable tolerance range from Table10 or Table 11, round the specified diameter
25、 to the nearest0.001 in. (0.01 mm) in accordance with the rounding method ofPractice E29.14.3 Measure the largest and smallest diameter taken at thesame cross section rounded to the nearest 0.001 in. (0.01 mm)in accordance with the rounding method of Practice E29.Calculate the average of the two mea
26、surements. The calculatedvalue shall not differ from the specified diameter by more thanthe applicable tolerance range shown in Table 10 or Table 11.15. Workmanship, Finish, and Appearance15.1 The zinc coating shall be reasonably smooth, continu-ous, of reasonably uniform thickness, and free from im
27、perfec-tions not consistent with good commercial practice.16. Number of Tests and Retests16.1 One test specimen shall be taken from each 5000 lbs or2500 kg, or fraction, thereof, in the inspection lot.16.2 Each specimen shall be tested for compliance withSections 8, 9, 11, and 14. At least half of t
28、he specimens shallbe tested for compliance with Section 10.16.3 Should one or more of the test specimens fail any ofthe tests specified, the nonconforming coil or coils may beremoved and the balance of the lot subjected to retests. Forretest purposes, two additional coils for each 5000 lbs or 2500kg
29、 in the lot shall be sampled and tested for the property inwhich the original sample failed to comply.16.4 Should any of the retest specimens fail to meet theproperties specified, the lot represented by the test specimensshall be rejected.16.5 Instead of rejecting the entire lot as provided in 16.4,
30、the producer may test specimens from every coil in the lot forthe property in which failure occurred, and reject only thenonconforming coils.17. Inspection17.1 Unless otherwise specified in the contract or purchaseorder, the manufacturer shall be responsible for the perfor-mance of all inspection an
31、d test requirements specified.17.2 All inspections and tests shall be made at the place ofmanufacture, unless otherwise especially agreed upon betweenthe manufacturer and the purchaser at the time of the purchase.TABLE 1 Chemical RequirementsElement Composition, %Carbon 0.50 to 0.88Manganese 0.50 to
32、 1.10Phosphorus, max 0.035Sulfur, max 0.045Silicon 0.10 to 0.35B 498/B 498M 08217.3 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable manufacturers facilities tosatisfy him that the material is being furnished in accordancewith this specification.18. Rejection an
33、d Rehearing18.1 Material that fails to conform to the requirements ofthis specification shall be rejected. Rejection should be re-ported to the producer or supplier promptly and in writing. Incase of dissatisfaction with the results of the test, the produceror supplier may make claim for a rehearing
34、.19. Certification19.1 When specified in the purchase order or contract, aproducers or suppliers certification shall be furnished to thepurchaser showing that the material was manufactured,sampled, tested, and inspected in accordance with this speci-fication and has been found to meet the requiremen
35、ts. WhenTABLE 2 Tensile RequirementsSpecifiedDiameter, in.Stress at 1 % Extension, min, Kpsi Ultimate Tensile Strength, min, Kpsi Elongation in 10 in., min, %ClassAClassCClassAClassCClassAClassC0.0500 to 0.0899,incl190 170 210 190 3.0 3.00.0900 to 0.1199,incl185 165 205 185 3.5 3.00.1200 to 0.1399,i
36、ncl180 160 205 185 4.0 3.00.1400 to 0.1900,incl170 155 200 180 4.0 4.0TABLE 3 Tensile Requirements (Metric)Specified Diameter, mmStress at 1 % Extension, min, MPa Ultimate Tensile Strength, min,MPaElongation in 250 mm, min, %ClassAClassCClassAClassCClassAClassC1.27 to 2.28, incl 1310 1170 1450 1310
37、3.0 3.02.29 to 3.04, incl 1280 1140 1410 1280 3.5 3.03.05 to 3.55, incl 1240 1100 1410 1280 4.0 3.03.56 to 4.82, incl 1170 1070 1380 1240 4.0 4.0TABLE 4 Initial Settings for Determining Stress at 1 % ExtensionSpecified Diameter,in.Initial Stress,KpsiInitial Setting of Extensometer,in./ in.0.0500 to
38、0.0899, incl 14 0.0005 (0.05 % extension)0.0900 to 0.1199, incl 28 0.0010 (0.10 % extension)0.1200 to 0.1900, incl 42 0.0015 (0.15 % extension)TABLE 5 Initial Settings for Determining Stress at 1 % Extension(Metric)Specified Diameter,mmInitial Stress,MPaInitial Setting of Extensometer,mm/mm1.27 to 2
39、.28, incl 100 0.0005 (0.05 % extension)2.29 to 3.04, incl 190 0.0010 (0.10 % extension)3.05 to 4.82, incl 290 0.0015 (0.15 % extension)TABLE 6 Zinc CoatingSpecified Diameter of CoatedWire, in.Area Density of Coating, min, ofUncoated Wire Surface, oz/ft2Class A Class C0.0500 to 0.0599, incl 0.60 1.80
40、0.0600 to 0.0749, incl 0.65 1.950.0750 to 0.0899, incl 0.70 2.100.0900 to 0.1039, incl 0.75 2.250.1040 to 0.1199, incl 0.80 2.400.1200 to 0.1399, incl 0.85 2.550.1400 to 0.1799, incl 0.90 2.700.1800 to 0.1900, incl 1.00 3.00TABLE 7 Zinc Coating (Metric)Specified Diameter of CoatedWire, mmArea Densit
41、y of Coating, min, ofUncoated Wire Surface, g/m2Class A Class C1.27 to 1.52, incl 183 5491.53 to 1.90, incl 198 5941.91 to 2.28, incl 214 6422.29 to 2.64, incl 229 6872.65 to 3.04, incl 244 7323.05 to 3.55, incl 259 7773.56 to 4.57, incl 274 8224.58 to 4.82, incl 305 915TABLE 8 Mandrel Size for Adhe
42、rence TestSpecified Wire Diameter, in.Ratio of Mandrel Diameter to WireDiameter0.0500 to 0.0899, incl 30.0900 to 0.1399, incl 40.1400 to 0.1900, incl 5TABLE 9 Mandrel Size for Adherence Test (Metric)Specified Wire Diameter, mmRatio of Mandrel Diameter to WireDiameter1.27 to 2.28, incl 32.29 to 3.04,
43、 incl 43.05 to 4.82, incl 5B 498/B 498M 083specified in the purchase order or contract, a report of the testresults shall be furnished.20. Packaging and Package Marking20.1 The unit lengths shall be as specified in the contract ororder. Length tolerances shall be plus or minus 2 %, unlessotherwise s
44、pecified by the purchaser. (See Explanatory Note 1.)20.2 Package dimensions, kind of package (coils, reels orreelless coils), and quantity of wire in each package shall beagreed upon between the manufacturer and purchaser.20.3 A durable tag shall be securely attached to eachpackage showing the nomin
45、al diameter of wire, class ofcoating, length, approximate weight, purchasers order num-ber, and manufacturers name.20.4 The starting end shall be identified.20.5 In case there is more than one piece in a package, thelength and position of each piece shall be shown on the tag.21. Keywords21.1 coated
46、steel wire; steel core wire; steel wire; zinc-coated steel wireEXPLANATORY NOTESNOTE 1Steel wire cannot be produced to exact specified lengths.Since welding of steel wires for use in electrical conductors is notaccepted, the random lengths of wire that results from normal productioncan result in oth
47、erwise good product being rejected and scrapped. In orderto reduce cost, the purchaser and manufacturer should, at the time ofpurchase, have an agreed upon method to permit the acceptance of oddlengths of steel wire.Atypical agreement would be to permit lengths otherthan the specified length for up
48、to 5 % of the purchased quantity with anysingle piece being not less than 50 % of the specified length.SUMMARY OF CHANGESCommittee B01 has identified the location of selected changes to this standard since the last issue (B 498/B498M 98 (2002) that may impact the use of this standard. (Approved Nov.
49、 1, 2008.)(1) Section 3 Added “product code” definition.(2) Section 4 Removed Class B coating.(3) Section 14 Simplified how diameter measurement ismade and recorded.(4) Metric Tables Modified diameter metric ranges to matchother steel wire standards.(5) Table 3 Modernized the chemistry ranges to matchSpecification B 606(6) Corrected typographical errors.TABLE 10 Permissible Variations in Diameter of Zinc-CoatedSteel WireNOTE 1It is recognized that the surface of zinc coatings, particularlythose produced by hot-dip galvanizing, are not perfectly smooth
