1、Designation: A 475 03 (Reapproved 2009)1Standard 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
2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1NOTEReapproved with editorial changes in May 2009.1. Scope1.1 Th
3、is specification covers five grades of zinc-coated,steel wire strand, 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
4、 Siemens-Martin,1.2.4 High-Strength, and1.2.5 Extra High-Strength.1.2.6 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
5、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 Weight Mass of Coating onIron
6、and Steel Articles with Zinc or Zinc-Alloy CoatingsA 902 Terminology Relating to Metallic Coated Steel Prod-uctsB6 Specification for Zinc3. Terminology3.1 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 s
7、trandthe designation of the finished strand shall beexpressed as the nominal diameter of the strand, the number ofthe wires in the strand, the minimum breaking strength of thestrand (see Section 7), and the class of coating (see Section 10).4. Ordering Information4.1 Orders for material under this s
8、pecification shall includethe following information:4.1.1 Quantity of strand in feet,4.1.2 Nominal strand diameter, number of wires, grade, andminimum 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 o
9、n 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 commerciallyaccepted steel making process and of such quality and puritythat, when drawn to the size of wire specified and coated withzinc, the finished strand
10、and the individual wires shall be ofuniform quality and have the properties and characteristics asprescribed in this specification.5.2 The slab zinc, when used for the coating, shall be anygrade of zinc conforming to Specification B6.6. Stranding6.1 Unless otherwise specified, strand shall have a le
11、ft lay.Aleft lay is defined as a counter-clockwise twist away from theobserver. All wires shall be stranded with uniform tension.Stranding shall be sufficiently close to ensure no appreciablereduction in diameter when stressed to 10 % of the minimumbreaking strength.1This specification is under the
12、jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition approved May 1, 2009. Published August 2009. Originallyapproved in 1962. Last previous edition approved in 2003 as A 475 - 03.2Fo
13、r 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 onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C70
14、0, West Conshohocken, PA 19428-2959, United States.TABLE 1 Physical Properties of Zinc-Coated Steel Wire StrandNOTE 1The numbers in boldface type indicate sizes and grades most commonly used and readily available.NominalDiameterof Strand,in. (mm)Numberof Wiresin StrandNominalDiameterof CoatedWires i
15、nStrand,in. (mm)ApproximateWeight ofStrand,lb/1000ft (kg/km)Minimum Breaking Strength of Strand, lbf (kN)Utilities GradeACommonGradeSiemens-MartinGradeHigh-StrengthGradeExtra High-StrengthGrade18 (3.18) 7 0.041 (1.04) 32 (48) . . . 540 (2.402) 910 (4.048) 1 330 (5.916) 1 830 (8.140)532 (3.97) 7 0.05
16、2 (1.32) 51 (76) . . . 870 (3.870) 1 470 (6.539) 2 140 (9.519) 2 940 (13.078)316 (4.76) 7 0.062 (1.57) 73 (109) . . . 1 150 (5.115) 1 900 (8.452) 2 850 (12.677) 3 990 (17.748)316 (4.76) 7 0.065 (1.65) 80 (119) 2 400 (10.676) (1)B. . . .732 (5.56) 3 0.104 (2.64) 88 (131) . . . 1 400 (6.228) 2 340 (10
17、.409) 3 500 (15.569) 4 900 (21.796)732 (5.56) 7 0.072 (1.83) 98 (146) . . . 1 540 (6.850) 2 560 (11.387) 3 850 (17.126) 5 400 (24.020)14 (6.35) 3 0.120 (3.05) 117 (174) 3 150 (14.012) (2)B1 860 (8.274) 3 040 (13.523) 4 730 (21.040) 6 740 (29.981)14 (6.35) 3 0.120 (3.05) 117 (174) 4 500 (20.017) (3)B
18、. . . .14 (6.35) 7 0.080 (2.03) 121 (180) . . . 1 900 (8.452) 3 150 (14.012) 4 750 (21.129) 6 650 (29.581)932 (7.14) 3 0.130 (3.30) 137 (204) . . . 2 080 (9.252) 3 380 (15.035) 5 260 (23.398) 7 500 (33.362)932 (7.14) 7 0.093 (2.36) 164 (244) 4 600 (20.462) (1)B2 570 (11.432) 4 250 (18.905) 6 400 (28
19、.469) 8 950 (39.812)516 (7.94) 3 0.145 (3.68) 171 (255) 6 500 (28.913) (3)B2 490 (11.076) 4 090 (18.193) 6 350 (28.246) 9 100 (40.479)516 (7.94) 7 0.104 (2.64) 205 (305) . . . 3 200 (14.234) 5 350 (23.798) 8 000 (35.586) 11 200 (49.820)516 (7.94) 7 0.109 (2.77) 225 (335) 6 000 (26.689) (1)B. . . .38
20、 (9.52) 3 0.165 (4.19) 220 (328) 8 500 (37.810) (3)B3 330 (14.813) 5 560 (24.732) 8 360 (37.187) 11 800 (52.489)38 (9.52) 7 0.120 (3.05) 273 (407) 11 500 (51.155) (4)B4 250 (18.905) 6 950 (30.915) 10 800 (48.040) 15 400 (68.503)716 (11.11) 7 0.145 (3.68) 399 (595) 18 000 (80.068) (4)B5 700 (25.355)
21、9 350 (41.591) 14 500 (64.499) 20 800 (92.523)12 (12.70) 7 0.165 (4.19) 517 (770) 25 000 (111.206) (4)B7 400 (32.917) 12 100 (53.823) 18 800 (83.627) 26 900 (119.657)12 (12.70) 19 0.100 (2.54) 504 (751) . . . 7 620 (33.895) 12 700 (56.492) 19 100 (84.961) 26 700 (118.768)916 (14.29) 7 0.188 (4.78) 6
22、71 (1000) . . . 9 600 (42.703) 15 700 (69.837) 24 500 (108.981) 35 000 (155.688)916 (14.29) 19 0.113 (2.87) 637 (949) . . . 9 640 (42.881) 16 100 (71.616) 24 100 (107.202) 33 700 (149.905)58 (15.88) 7 0.207 (5.26) 813 (1211) . . . 11 600 (51.599) 19 100 (84.961) 29 600 (131.667) 42 400 (188.605)58 (
23、15.88) 19 0.125 (3.18) 796 (1186) . . . 11 000 (48.930) 18 100 (80.513) 28 100 (124.995) 40 200 (178.819)34 (19.05) 19 0.150 (3.81) 1 155 (1721) . . . 16 000 (71.172) 26 200 (116.543) 40 800 (181.487) 58 300 (259.331)78 (22.22) 19 0.177 (4.50) 1 581 (2356) . . . 21 900 (97.416) 35 900 (159.691) 55 8
24、00 (248.211) 79 700 (354.523)1 (25.40) 19 0.200 (5.08) 2 073 (3089) . . . 28 700 (127.664) 47 000 (209.066) 73 200 (325.610) 104 500 (464.839)1 (25.40) 37 0.143 (3.63) 2 057 (3065) . . . 28 300 (125.885) 46 200 (205.508) 71 900 (319.827) 102 700 (456.832)118 (28.58) 37 0.161 (4.09) 2 691 (4010) . .
25、. 36 000 (160.136) 58 900 (262.000) 91 600 (407.457) 130 800 (581.827)114 (31.75) 37 0.179 (4.55) 3 248 (4840) . . . 44 600 (198.391) 73 000 (324.720) 113 600 (505.318) 162 200 (721.502)AThe utilities grade is used principally by communication and power and light industries.BRefer to elongation requ
26、irements specified in Section 8.A47503(2009)126.2 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 The 7-wire strand shall consist of a center wire with a6-wire layer conc
27、entrically 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 right layand a uniform pitch of not more than 163 the nominaldiameter of t
28、his 7-wire core. The nominal diameter of this7-wire core shall be considered to be 33 the nominal diameterof 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 nominaldiameter of the
29、 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 be 33 the nom
30、inal 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 53 the nomin
31、al 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 in the complet
32、ed 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 per unit leng
33、th 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 within the jaws or
34、 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 strand in 24 in
35、. (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. The separa
36、-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. Additional sample
37、sshall 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 turns/min
38、 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, andTABLE 2 Nominal Diameters and Mi
39、nimum Weights of Coatingfor Zinc-Coated Steel WiresANominal Diam-eter of CoatedWire in theStrand, in.(mm)Minimum Weight of Coating, oz/ft2(g/m2) of Uncoated WireSurfaceClass 1BClass ACClass BDClass CD0.041 (1.04) 0.15 (46) 0.40 (122) 0.80 (244) 1.20 (366)0.052 (1.32) 0.15 (46) 0.40 (122) 0.80 (244)
40、1.20 (366)0.062 (1.57) 0.15 (46) 0.50 (153) 1.00 (305) 1.50 (458)0.065 (1.65) 0.15 (46) 0.50 (153) 1.00 (305) 1.50 (458)0.072 (1.83) 0.15 (46) 0.50 (153) 1.00 (305) 1.50 (458)0.080 (2.03) 0.30 (92) 0.60 (183) 1.20 (366) 1.80 (549)0.093 (2.36) 0.30 (92) 0.70 (214) 1.40 (427) 2.10 (641)0.100 (2.54) 0.
41、30 (92) 0.70 (214) 1.40 (427) 2.10 (641)0.104 (2.64) 0.30 (92) 0.80 (244) 1.60 (488) 2.40 (732)0.109 (2.77) 0.30 (92) 0.80 (244) 1.60 (488) 2.40 (732)0.113 (2.87) 0.30 (92) 0.80 (244) 1.60 (488) 2.40 (732)0.120 (3.05) 0.30 (92) 0.85 (259) 1.70 (519) 2.55 (778)0.125 (3.18) 0.30 (92) 0.85 (259) 1.70 (
42、519) 2.55 (778)0.130 (3.30) 0.30 (92) 0.85 (259) 1.70 (519) 2.55 (778)0.143 (3.63) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.145 (3.68) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.150 (3.81) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.161 (4.09) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.165
43、(4.19) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.177 (4.50) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.179 (4.55) 0.40 (122) 0.90 (275) 1.80 (549) 2.70 (824)0.188 (4.78) 0.40 (122) 1.00 (305) 2.00 (610) 3.00 (915)0.200 (5.08) 0.40 (122) 1.00 (305) 2.00 (610) 3.00 (915)0.207 (5.26) 0.40 (122) 1.
44、00 (305) 2.00 (610) 3.00 (915)AFor intermediate sizes of wire in the 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 equi
45、valent terms.DClass A, Class B, and Class C coatings apply to all grades 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-Stren
46、gth 5Utilities Grade (4)Aand Extra High-Strength 4ASee Table 1, Footnote B.A 475 03 (2009)13extra high-strength grade 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 Ta
47、ble 2.10.2 The weight of the zinc coating shall be determined bya stripping test in accordance with Test Method A 90/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 helixof at least two turns around a cylindrica
48、l 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 superficial smallparticles of zinc formed by mechanica
49、l 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 joints 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 provide
