ASTM A475-2003 Standard Specification for Zinc-Coated Steel Wire Strand《镀锌钢绞线的标准规范》.pdf

1、Designation: A 475 03Standard Specification forZinc-Coated Steel Wire Strand1This standard is issued under the fixed designation A 475; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parenthe

2、ses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers five grades of zinc-coated,steel wire strand

3、, composed of a number of round, steel wires,with four weights of zinc coatings, suitable for use as guys,messengers, span wires, and for similar purposes.1.2 The five grades covered are as follows:1.2.1 Utilities,1.2.2 Common,1.2.3 Siemens-Martin,1.2.4 High-Strength, and1.2.5 Extra High-Strength.1.

4、2.6 Minimum breaking strengths of strand for each gradeare described in Section 7.1.3 The four weights of zinc coatings are: Class 1 andClasses A, B, and C. Minimum weights of zinc coatings aredescribed in Section 10.1.4 The values stated in inch-pound units are to be regardedas the standard. The va

5、lues given in brackets are for informa-tion only.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zonc-Alloy CoatingsA 902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for Zinc3. Terminology

6、3.1 DefinitionsFor definitions of terms used in this stan-dard, refer to Terminology A 902.3.2 Definitions of Terms Specific to This Standard:3.2.1 strandthe designation of the finished strand shall beexpressed as the nominal diameter of the strand, the number ofthe wires in the strand, the minimum

7、breaking strength of thestrand (see Section 7), and the class of coating (see Section 10).4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of strand in feet,4.1.2 Nominal strand diameter, number of wires, grade, andminimum

8、breaking strength of strand (Section 7 and Table 1),4.1.3 Weight (class) of zinc coating (Section 10 and Table2),4.1.4 Length of strand in coils or on reels (Section 18), and4.1.5 ASTM designation and year of issue.5. Materials and Manufacture5.1 The base metal shall be steel made by any commerciall

9、yaccepted steel making process and of such quality and puritythat, when drawn to the size of wire specified and coated withzinc, the finished strand and the individual wires shall be ofuniform quality and have the properties and characteristics asprescribed in this specification.5.2 The slab zinc, w

10、hen used for the coating, shall be anygrade of zinc conforming to Specification B6.6. Stranding6.1 Unless otherwise specified, strand shall have a left lay.Aleft lay is defined as a counter-clockwise twist away from theobserver. All wires shall be stranded with uniform tension.Stranding shall be suf

11、ficiently close to ensure no appreciablereduction in diameter when stressed to 10 % of the minimumbreaking strength.6.2 The 3-wire strand shall consist of three wires concen-trically twisted with a uniform pitch of not less than 14 normore than 203 the specified nominal diameter of the strand.6.3 Th

12、e 7-wire strand shall consist of a center wire with a6-wire layer concentrically twisted over it with a uniform pitchof not more than 163 the specified nominal diameter of thestrand.6.4 The 19-wire strand shall consist of a center wire with a6-wire layer concentrically twisted over it, having a righ

13、t layand a uniform pitch of not more than 163 the nominaldiameter of this 7-wire core. The nominal diameter of this7-wire core shall be considered to be 33 the nominal diameter1This specification is under the jurisdiction of ASTM Committee A05 onMetallic Coated Iron and Steel Products and is the dir

14、ect responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition approved October 1, 2003. Published December 2003. Originallyapproved in 1962. Last previous edition approved in 1998 as A 475 - 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cus

15、tomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document 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 Conshohocke

16、n, PA 19428-2959, United States.TABLE1PhysicalPropertiesofZinc-CoatedSteelWireStrandNOTE1Thenumbersinboldfacetypeindicatesizesandgradesmostcommonlyusedandreadilyavailable.NominalDiameterofStrand,in.mmNumber ofWiresinStrandNominalDiameterofCoatedWiresinStrand,in.mmApproximateWeightofStrand, lb/1000ft

17、kg/kmMinimumBreakingStrengthofStrand,lbfkNUtilitiesGradeACommonGradeSiemens-Martin GradeHigh-StrengthGradeExtraHigh-StrengthGrade183.1870.0411.043248.5402.4029104.04813305.91618308.1405323.9770.0521.325176.8703.87014706.53921409.519294013.0783164.7670.0621.5773109.11505.11519008.452285012.677399017.

18、7483164.7670.0651.6580119240010.676(1)B.7325.5630.1042.6488131.14006.228234010.409350015.569490021.7967325.5670.0721.8398146.15406.850256011.387385017.126540024.020146.3530.1203.05117174315014.012(2)B18608.274304013.523473021.040674029.981146.3530.1203.05117174450020.017(3)B.146.3570.0802.03121180.1

19、9008.452315014.012475021.129665029.5819327.1430.1303.30137204.20809.252338015.035526023.398750033.3629327.1470.0932.36164244460020.462(1)B257011.432425018.905640028.469895039.8125167.9430.1453.68171255650028.913(3)B249011.076409018.193635028.246910040.4795167.9470.1042.64205305.320014.234535023.7988

20、00035.5861120049.8205167.9470.1092.77225335600026.689(1)B.389.5230.1654.19220328850037.810(3)B333014.813556024.732836037.1871180052.489389.5270.1203.052734071150051.155(4)B425018.905695030.9151080048.0401540068.50371611.1170.1453.683995951800080.068(4)B570025.355935041.5911450064.4992080092.5231212.

21、7070.1654.1951777025000111.206(4)B740032.9171210053.8231880083.62726900119.6571212.70190.1002.54504751.762033.8951270056.4921910084.96126700118.76891614.2970.1884.786711000.960042.7031570069.83724500108.98135000155.68891614.29190.1132.87637949.964042.8811610071.61624100107.20233700149.9055815.8870.2

22、075.268131211.1160051.5991910084.96129600131.66742400188.6055815.88190.1253.187961186.1100048.9301810080.51328100124.99540200178.8193419.05190.1503.8111551721.1600071.17226200116.54340800181.48758300259.3317822.22190.1774.5015812356.2190097.41635900159.69155800248.21179700354.523125.40190.2005.08207

23、33089.28700127.66447000209.06673200325.610104500464.839125.40370.1433.6320573065.28300125.88546200205.50871900319.827102700456.83211828.58370.1614.0926914010.36000160.13658900262.00091600407.457130800581.82711431.75370.1794.5532484840.44600198.39173000324.720113600505.318162200721.502ATheutilitiesgr

24、adeisusedprincipallybycommunicationandpowerandlightindustries.BRefertoelongationrequirementsspecifiedinSection8.A475032of the wires. A 12-wire outer layer, having a left lay shall beconcentrically twisted over the 7-wire core and shall have auniform pitch of not more than 163 the specified nominaldi

25、ameter of the strand.6.5 The 37-wire strand shall consist of a center wire with a6-wire layer concentrically twisted over it, having a left lay anda uniform pitch of not more than 163 the nominal diameter ofthis 7-wire inner core. The nominal diameter of this 7-wireinner core shall be considered to

26、be 33 the nominal diameterof the wire.An intermediate layer of 12 wires having a right layshall be concentrically twisted over this 7-wire core and shallhave a uniform pitch of not more than 163 the nominaldiameter of this 19-wire core. The nominal diameter of this19-wire core shall be considered as

27、 53 the nominal diameter ofthe wires. An 18-wire outer layer, having a left lay shall beconcentrically twisted over the 19-wire core and shall have auniform pitch of not more than 163 the specified nominaldiameter of the strand.6.6 All wires in the strand shall lie naturally in their truepositions i

28、n the completed strand and, when the strand is cut,the ends shall remain in position or be readily replaced by handand then remain in position. This may be accomplished by anymeans or process, such as preforming, post forming, or formsetting.7. Breaking Strength and Weight7.1 The approximate weight

29、per unit length of strand andthe minimum breaking strength of the finished strand shall beas specified in Table 1.7.2 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 withi

30、n 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. Tests shall be made on lengths of strand that do notcontain wire joints or splices.8. Elongation8.1 The elongation of the stra

31、nd in 24 in. 610 mm shall benot less than that specified in Table 3.8.2 The elongation shall be determined as the percentincrease in separation between the jaws of the testing machinefrom the position after application of the initial load to theposition at the initial failure in the test specimen. T

32、he separa-tion of the jaws of the testing machine shall be approximately2 ft when under an initial load equal to 10 % of the requiredminimum breaking strength of the strand. The elongationvalues shall be recorded only for specimens which break over1 in. from the jaws of the testing machine. Addition

33、al samplesshall be taken from the same coil or reel when the previoustests are to be disregarded.8.3 Elongation tests shall be made on lengths of strandwhich do not contain wire joints or splices.9. Ductility of Steel9.1 The zinc-coated wire shall not fracture when wrapped ata rate not exceeding 15

34、turns/min in a close helix of at least 2turns around a cylindrical mandrel. The mandrel diameter fortesting common and Siemens-Martin grade strand shall beequal to the nominal diameter of the individual wires of thestrand. The mandrel diameter for utilities, high-strength, andextra high-strength gra

35、de strand, shall be equal to 33 thenominal diameter of the individual wires of the strand.10. Weight of Coating10.1 The weight of zinc coating shall not be less than thatspecified in Table 2.10.2 The weight of the zinc coating shall be determined bya stripping test in accordance with Test Method A 9

36、0/A 90M.11. Adherence of Coating11.1 The zinc-coated wire shall be capable of beingwrapped at a rate not exceeding 15 turns/min in a close helixTABLE 2 Nominal Diameters and Minimum Weights of Coatingfor Zinc-Coated Steel WiresANominal Diam-eter of CoatedWire in theStrand, in.mmMinimum Weight of Coa

37、ting, oz/ft2g/m2 of Uncoated WireSurfaceClass 1BClass ACClass BDClass CD0.041 1.04 0.15 46 0.40 122 0.80 244 1.20 3660.052 1.32 0.15 46 0.40 122 0.80 244 1.20 3660.062 1.57 0.15 46 0.50 153 1.00 305 1.50 4580.065 1.65 0.15 46 0.50 153 1.00 305 1.50 4580.072 1.83 0.15 46 0.50 153 1.00 305 1.50 4580.0

38、80 2.03 0.30 92 0.60 183 1.20 366 1.80 5490.093 2.36 0.30 92 0.70 214 1.40 427 2.10 6410.100 2.54 0.30 92 0.70 214 1.40 427 2.10 6410.104 2.64 0.30 92 0.80 244 1.60 488 2.40 7320.109 2.77 0.30 92 0.80 244 1.60 488 2.40 7320.113 2.87 0.30 92 0.80 244 1.60 488 2.40 7320.120 3.05 0.30 92 0.85 259 1.70

39、519 2.55 7780.125 3.18 0.30 92 0.85 259 1.70 519 2.55 7780.130 3.30 0.30 92 0.85 259 1.70 519 2.55 7780.143 3.63 0.40 122 0.90 275 1.80 549 2.70 8240.145 3.68 0.40 122 0.90 275 1.80 549 2.70 8240.150 3.81 0.40 122 0.90 275 1.80 549 2.70 8240.161 4.09 0.40 122 0.90 275 1.80 549 2.70 8240.165 4.19 0.4

40、0 122 0.90 275 1.80 549 2.70 8240.177 4.50 0.40 122 0.90 275 1.80 549 2.70 8240.179 4.55 0.40 122 0.90 275 1.80 549 2.70 8240.188 4.78 0.40 122 1.00 305 2.00 610 3.00 9150.200 5.08 0.40 122 1.00 305 2.00 610 3.00 9150.207 5.26 0.40 122 1.00 305 2.00 610 3.00 915AFor intermediate sizes of wire in the

41、 strand, the weight designations are thesame as for the next finer size shown in this table.BClass 1 (formerly “galvanized”) coating applies to common grade of strandonly.CClass A, “extra galvanized” and “double galvanized” are equivalent terms.DClass A, Class B, and Class C coatings apply to all gr

42、ades of strand.TABLE 3 Elongation Requirements for Grades of StrandGrade of Strand Elongation in 24in. 610 mm,min, %Utilities Grade (1)Aand Common Strand 10Utilities Grade (2)Aand Siemens-Martin 8Utilities Grade (3)Aand High-Strength 5Utilities Grade (4)Aand Extra High-Strength 4ASee Table 1, Footno

43、te B.A475033of at least two turns around a cylindrical mandrel equal to 33the nominal diameter of the wire under test, without crackingor delaminating the zinc coating to such an extent that any zinccan be removed by rubbing with the bare fingers. Loosening ordetachment during the adhesion test of s

44、uperficial smallparticles of zinc formed by mechanical polishing of the surfaceof zinc-coated wire shall not be considered cause for rejection.12. Joints and Splices12.1 Electric-welded butt joints made prior to the start ofcold drawing of the wire are permitted; however, no electric-welded butt joi

45、nts shall be made during the cold drawingoperation. Electric-welded butt joints of the wire shall bepermitted only as specified in 12.2.12.2 In 3-wire strand, there shall be no joints made in theindividual finished wire. In 7-wire strand, joints made inindividual finished wires shall be acceptable p

46、rovided there isnot more than one joint in any 150-ft 45.7-m section of thecompleted strand and the location of each joint is marked onthe strand with paint or some other distinguishing mark.Factory joints made in the individual finished wires of 19 and37-wire strand shall be kept well spaced and at

47、 a minimum innumber.12.3 Joints in the wires composing the strand shall be eitherthe brazed-lap type or electric-butt-welded type. When thebrazed type of joint is used, the length of the lap shall be notless than 33 the diameter of the wire and the overlapping facesshall be smooth, clean, properly fluxed, and completely cov-ered by the brazing metal. When the electric-welded type ofjoint is used, care shall be taken to prevent injury to the wiredu