ASTM B958 B958M-2016 Standard Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc&x2013 5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhe.pdf

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1、Designation: B958/B958M 081B958/B958M 16Standard Specification forExtra-High-Strength and Ultra-High-Strength Class AZinc5% Aluminum-Mischmetal Alloy-Coated Steel CoreWire for Use in Overhead Electrical Conductors1This standard is issued under the fixed designation B958/B958M; the number immediately

2、 following the designation indicates the yearof original adoption or, in the 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 NOTEDesignation was c

3、orrected editorially in October 2013.1. Scope1.1 This specification covers round, extra-high-strength, and ultra-high-strength, Class A coated zinc5 % aluminum-mischmetal (Zn5AlMM) alloy-coated, steel core wire for use in Overhead Electrical Conductors.1.2 This specification covers wire of diameter

4、from 0.0500 to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Comb

5、ining values from thetwo systems may result in non-conformance with the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and de

6、termine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA751 Test Me

7、thods, Practices, and Terminology for Chemical Analysis of Steel ProductsB193 Test Method for Resistivity of Electrical Conductor MaterialsB750 Specification for GALFANE1277 Test Method for Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission SpectrometryE29 Practice for Using Significant

8、 Digits in Test Data to Determine Conformance with Specifications2.2 Other Standard:GF-1 Standard Practice for Determination of Cerium and Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 % La- 0.04% Ce-Bal SHG Zn)33. Terminology3.1 Abbreviations:3.1.1 MMmischmetal3.1.2 Zn5AlMMzinc5%zinc5 % alumi

9、num mischmetal alloy3.2 Definitions of Terms Specific to This Standard:3.2.1 Lot, nUnless otherwise specified in the contract or order, a lot shall consist of all coils of wire of the same diameter andunit lengths submitted for inspection at the same time.1 This test method specification is under th

10、e jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.05 onConductors of Ferrous Metals.Current edition approved Nov. 1, 2008Dec. 1, 2016. Published December 2008December 2016. Originally approved in 2008. Last previous edition approved in

11、 2008 asB958 081. DOI: 10.1520/B0958_B0958M-08E01.10.1520/B0958_B0958M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary pag

12、e on the ASTM website.3 Available from the International Lead Zinc Research Organization (ILZRO), 1822 NC Highway 54 East, Suite 120, Durham NC 27713, http:/www.ilzro.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes

13、have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official

14、document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.2 Product Code, nDefines product coating type, coating class, and strength grade.Extra High Strength Grade Zn5AlMM, Class A Coated, use Code MA4.Ultra High Strength Grade Zn

15、5AlMM, Class A Coated, use Code MA5.3.2.2.1 Extra High Strength Grade Zn5AlMM, Class A Coateduse Code MA4.3.2.2.2 Ultra High Strength Grade Zn5AlMM, Class A Coateduse Code MA5.4. Ordering Information4.1 Orders for material under this specification shall include the following information:4.1.1 Quanti

16、ty of each size,4.1.2 Wire diameter in inches or millimeter (Section 13),4.1.3 Certification, if required (Section 18),4.1.4 Test report, if required (Section 18), and4.1.5 Package Size (Section 19).4.1.6 Product Code5. Materials and Manufacture5.1 The base metal shall be steel produced by the open-

17、hearth, electric furnace, or basic oxygen process.5.2 The wire shall be cold drawn and coated with Zn5AlMM alloy to produce the desired properties.6. Chemical Composition6.1 The steel shall conform to the requirements prescribed in Table 1.6.2 Chemical analysis of the steel shall be conducted in acc

18、ordance with Test Methods, Practices, and Terminology A751.6.3 The ingot form of zinc-5 % aluminum-mischmetal alloy shall conform to Specification B750.6.3.1 For a two-step coating operation where the first coating is zinc (hot-dip galvanized or electro-galvanized), the final bathmay have an aluminu

19、m content of up to 7.2 %, to prevent depletion of the aluminum content of the bath.6.3.2 Method of Coating Material AnalysisRefer to Specification B750.7. Tensile Test7.1 The Zn5AlMM-coated steel core wire shall conform to the tensile and elongation requirements prescribed in Table 2,Table 3, Table

20、4, or Table 5 depending on which strength grade and unit base ordered.7.2 Tensile tests shall be conducted in accordance with Test Methods and Definitions A370, using the initial settings fordetermining stress at 1 % extension given in Table 6 or Table 7 of this specification.7.3 Test SpecimensThe t

21、est specimens shall be free of bends or kinks other than the curvature resulting from the usual coilingoperations. Any hand straightening necessary to permit insertion of the specimen in the jaws of the testing machine shall beperformed by drawing between wood blocks or by some other equally satisfa

22、ctory means.7.4 The nominal diameter requested shall be used to determine the applicable strength specification from the tables.8. Wrap Test8.1 The material, as represented by the test specimens, shall not fracture when the Zn5AlMM alloy-coated wire is wrappedat a rate not exceeding 15 turns/min in

23、a close helix of at least eight turns around a cylindrical mandrel with a diameter equal tofour times the specified diameter of the wire under test, 65 %.9. Coating Test9.1 The Zn5AlMM alloy-coated wire shall conform to the coating requirements prescribed in Table 8 or Table 9.9.2 The coating test s

24、hall be conducted in accordance with Test Method A90/A90M.TABLE 1 Chemical RequirementsElement Composition, %Element Composition, %Carbon 0.50 to 1.00Manganese 0.40 to 1.30Manganese 0.30 to 1.30Phosphorus, max 0.035Sulfur, max 0.045Silicon 0.15 to 0.60Silicon 0.15 to 1.20B958/B958M 16210. Adherence

25、of Coating Test10.1 The Zn5AlMM alloy-coated wire shall be capable of being wrapped in a close helix at a rate not exceeding 15 turns/minaround a cylindrical mandrel having a diameter as prescribed in Table 10 or Table 11, without cracking or flaking the coating tosuch an extent that any Zn5AlMM all

26、oy can be removed by rubbing with the bare fingers.TABLE 2 Grade 4 Extra-High-Strength Tensile RequirementsSpecified Diameter,in.Stressat 1%Extension,min, kpsiUltimateTensileStrength,min, kpsiElongationin 10 in.,min %Specified Diameter,in.Stressat 1%Extension,min, kpsiUltimateTensileStrength,min, kp

27、siElongationin 10 in.,min %0.0500 to 0.0899, incl 225 265 3.00.0900 to 0.1199, incl 220 260 3.00.1200 to 0.1399, incl 215 255 3.50.1400 to 0.1900, incl 210 250 3.5TABLE 3 Grade 4 Extra-High-Strength Tensile RequirementsMetricSpecified Diameter,mmStressat 1%Extension,min, MPaUltimateTensileStrength,m

28、in, MPaElongationin 250 mm,min %Specified Diameter,mmStressat 1%Extension,min, MPaUltimateTensileStrength,min, MPaElongationin 250 mm,min %1.27 to 2.28, incl 1550 1825 3.02.29 to 3.04, incl 1515 1790 3.03.05 to 3.55, incl 1480 1760 3.53.56 to 4.82, incl 1450 1725 3.5TABLE 4 Grade 5 Ultra-High-Streng

29、th Tensile RequirementsSpecified Diameter,in.Stressat 1%Extension,min, kpsiUltimateTensileStrength,min, kpsiElongationin 10 in.,min %Specified Diameter,in.Stressat 1%Extension,min, kpsiUltimateTensileStrength,min, kpsiElongationin 10 in.,min %0.0500 to 0.0899, incl 230 285 3.00.0900 to 0.1199, incl

30、225 275 3.00.1200 to 0.1399, incl 220 270 3.50.1400 to 0.1900, incl 215 265 3.5TABLE 5 Grade 5 Ultra-High-Strength Tensile RequirementsMetricSpecified Diameter,mmStressat 1%Extension,min, MPaUltimateTensileStrength,min, MPaElongationin 250 mm,min %Specified Diameter,mmStressat 1%Extension,min, MPaUl

31、timateTensileStrength,min, MPaElongationin 250 mm,min %1.27 to 2.28, incl 1580 1965 3.02.29 to 3.04, incl 1550 1900 3.03.05 to 3.55, incl 1515 1860 3.53.56 to 4.82, incl 1480 1825 3.5B958/B958M 16311. Joints11.1 No joints shall be made in the finished wire.11.2 Joints may be made at any stage of pro

32、cessing prior to final cold drawing by the electric butt-weld or flash-welding process.11.3 Welding equipment and procedure shall be such that it can be demonstrated that the ultimate tensile strength of a finishedwire specimen containing the welded section shall be not less than 96 % of the specifi

33、ed minimum stress at 1 % extension.TABLE 6 Initial Settings for Determining Stress at 1% ExtensionSpecified Diameter,in.Initial Stress,kpsiInitial Settingof Extensometer,in./in.Specified Diameter,in.Initial Stress,kpsiInitial Settingof Extensometer,in./in.0.0500 to 0.0899, incl 18 0.0005 (0.05 % ext

34、ension)0.0900 to 0.1199, incl 36 0.0010 (0.10 % extension)0.1200 to 0.1900, incl 54 0.0015 (0.15 % extension)TABLE 7 Initial Settings for Determining Stress at 1% ExtensionMetricSpecified Diameter,mmInitial Stress,MPaInitial Settingof Extensometer,mm/mmSpecified Diameter,mmInitial Stress,MPaInitial

35、Settingof Extensometer,mm/mm1.27 to 2.28, incl 125 0.0005 (0.05 % extension)2.29 to 3.04, incl 250 0.0010 (0.10 % extension)3.05 to 4.82, incl 375 0.0015 (0.15 % extension)TABLE 8 Zn-5AlMM Alloy CoatingSpecified Diameterof Coated Wire, in.Area Densityof Zn5AlMM Alloy Coatingmin of Uncoated Wire Surf

36、ace,oz/ft2Specified Diameterof Coated Wire, in.Area Densityof Zn5AlMM Alloy Coatingmin of Uncoated Wire Surface,oz/ft20.0500 to 0.0599, incl 0.600.0600 to 0.0749, incl 0.650.0750 to 0.0899, incl 0.700.0900 to 0.1039, incl 0.750.1040 to 0.1199, incl 0.800.1200 to 0.1399, incl 0.850.1400 to 0.1799, in

37、cl 0.900.1800 to 0.1900, incl 1.00TABLE 9 Zn5AlMM Alloy Coating MetricSpecified Diameterof Coated Wire, mmArea Densityof Zn5AlMM Alloy Coatingmin of Uncoated Wire Surface,g/m2Specified Diameterof Coated Wire, mmArea Densityof Zn5AlMM Alloy Coatingmin of Uncoated Wire Surface,g/m21.27 to 1.52, incl 1

38、831.53 to 1.90, incl 1981.91 to 2.28, incl 2142.29 to 2.64, incl 2292.65 to 3.04, incl 2443.05 to 3.55, incl 2593.56 to 4.57, incl 2744.58 to 4.82, incl 305B958/B958M 16411.4 A welded section shall not be required to meet the stress at 1 % extension, elongation, and wrap tests.12. Density and Resist

39、ivity12.1 For the purpose of calculating mass per unit length, cross sections, and so forth, the density of Zn5AlMM alloy-coatedsteel wire at 20C shall be taken as 0.281 lb/in.3 7780 kg/m3.12.2 A maximum resistivity of Zn5AlMM alloy-coated steel wire is not guaranteed but a typical value of 0.19157

40、mm2/mmay be used for calculating purposes. For conversion to other units of conductivity or resistivity, refer to Test Method B193.13. Dimensions, Mass, and Permissible Variations13.1 The specified diameter of the Zn5AlMM alloy-coated wire from Section 4 shall be expressed in decimal fractions of an

41、inch to four decimal places, or in millimeters to two decimal places.13.2 To determine the applicable tolerance range from Table 12 or Table 13, round the specified diameter to the nearest 0.001in. (0.01 mm) in accordance with the rounding method of Practice E29.13.3 Measure the largest and smallest

42、 diameter taken at the same cross section rounded to the nearest 0.001 in. 0.01 mm inaccordance with the rounding method of Practice E29. Calculate the average of the two measurements. The calculated value shallnot differ from the specified diameter by more than the applicable tolerance range shown

43、in Table 12 or Table 13.14. Workmanship, Finish, and Appearance14.1 The Zn5AlMM alloy coating shall be reasonably smooth, continuous, of reasonably uniform thickness and free ofimperfections not consistent with good commercial practice.TABLE 10 Mandrel Size for Adherence TestNOTE 1Loosening or detac

44、hment during the adhesion test ofsuperficial, small particles of Zn5AlMM alloy formed by mechanicalpolishing of the surface of the coated wire shall not be considered causefor rejection.Specified Wire Diameter,in.Ratio of Mandrel Diameterto Wire DiameterSpecified Wire Diameter,in.Ratio of Mandrel Di

45、ameterto Wire Diameter0.0500 to 0.1399, incl 40.1400 to 0.1900, incl 5TABLE 11 Mandrel Size for Adherence Test (Metric)Specified Wire Diameter,mmRatio of Mandrel Diameterto Wire DiameterSpecified Wire Diameter,mmRatio of Mandrel Diameterto Wire Diameter1.27 to 3.55, incl 43.56 to 4.82, incl 5TABLE 1

46、2 Permissible Variations in Diameter of Zn5AlMMAlloy-Coated Steel WireNOTE 1It is recognized that the surface of coatings, particularly thoseproduced by the hot-dip method of coating, are not perfectly smooth anddevoid of irregularities. If the tolerances shown in the table are rigidlyapplied to suc

47、h irregularities that are inherent to the product, unjustifiedrejections of wire that would actually be satisfactory for use could occur.It is intended that these tolerances be used in gaging the wires where thereis a minimum of such diameter irregularities due to hot dip coating.Specified Diameter,

48、in.Permissible Variation,in.Specified Diameter,in.Permissible Variation,in.Plus Minus0.0500 to 0.0749, incl 0.0015 0.0010.0750 to 0.1199, incl 0.002 0.0020.1200 to 0.1399, incl 0.003 0.0020.1400 to 0.1900, incl 0.004 0.003B958/B958M 16515. Number of Tests and Retests15.1 One test specimen shall be t

49、aken from each 5000 lb 2500 kg or fraction thereof in the inspection lot.15.2 Each specimen shall be tested for compliance with Sections 7, 8, 10, and 13. At least half of the specimens shall be testedfor compliance with Section 9.15.3 Should one or more of the test specimens fail any of the tests specified, the nonconforming coil or coils may be removedand the balance of the lot subjected to retests. For retest purposes, two additional coils for each 5000 lb 2500 kg in the lot shallbe s