1、Designation: A474 03 (Reapproved 2017)Standard Specification forAluminum-Coated Steel Wire Strand1This standard is issued under the fixed designation A474; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers five grades of aluminum-coated, steel wire strand, composed of a number of round, steelwires, with aluminum
3、 coatings, 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.1.3 Minimum breaking strengths of strand for each gradeare specified in Table 1.1
4、.4 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.1.5 This international standard was developed in accor-dance with internationally reco
5、gnized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A428/A428M Test Meth
6、od for Weight Mass of Coating onAluminum-Coated Iron or Steel Articles3. Description of Strand3.1 The designation of the finished strand shall be expressedas the nominal diameter of the strand, the number of the wiresin the strand, and the grade of the strand as prescribed in Table1.4. Ordering Info
7、rmation4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of strand in feet.4.1.2 Nominal strand diameter (size), number of wires,grade, and minimum breaking strength of strand (Section 8 andTable 1).4.1.3 Length of strand in coils or on reels (Sec
8、tion 19).5. Material and Manufacture5.1 The base metal shall be steel made any commerciallyaccepted steel making process and of such quality and puritythat, when drawn to the size of wire specified and coated withaluminum, the finished strand and the individual wires shall beof uniform quality and h
9、ave the properties and characteristicsas prescribed in this specification.5.2 The ingot or pig aluminum used for coating shallconform to the following impurity limits: copper, maximum,%, 0.10, and iron, maximum, %, 0.50.6. Stranding6.1 Unless otherwise specified, 3-wire strand shall have aleft lay w
10、ith a uniform pitch of not less than 10 nor more than16 times the nominal diameter of the strand. Seven-wire strandshall have a left lay with a uniform pitch of not more than 16times the nominal diameter of the strand. A left lay is definedas a counter-clockwise twist away from the observer. All wir
11、esshall be stranded with uniform tension. Stranding shall besufficiently close to ensure no appreciable reduction in diam-eter when stressed to 10% of the specified strength.6.2 All wires in the strand shall lie naturally in their truepositions in the completed strand, and when the strand is cut,the
12、 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. Joints and Splices7.1 There shall be no strand joints or strand splices in anylength of the completed strand
13、unless specifically permitted bythe purchaser.7.2 In 3-wire strand, there shall be no joints in individualwires. In 7-wire strand, joints in individual wires shall be1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct respon
14、sibility of Subcom-mittee A05.12 on Wire Specifications.Current edition approved Sept. 1, 2017. Published September 2017. Originallyapproved in 1962. Last previous edition approved in 2013 as A474 03(2013).DOI: 10.1520/A0474-03R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
15、 orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis internationa
16、l standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
17、1acceptable provided there is not more than one joint in any150-ft (46-m) section of the completed strand and the locationof each wire joint is marked on the strand with paint or someother distinguishing mark.7.3 Joints in the wires composing the strand shall be of theelectric-butt-welded type. Care
18、 shall be taken to prevent injuryto the wire during electric-butt-welding. All joints shall be wellmade and shall have protection from corrosion equivalent tothat of the aluminum-coated wire itself.8. Breaking Strength and Weight8.1 The minimum breaking strength of the finished strandshall be as spe
19、cified in Table 1 and the approximate weight per1000 ft or 305 m of strand shall be as indicated in Table 1.8.2 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
20、jaws or within 1 in. (25 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.9. Elongation9.1 The elongation of the strand in
21、24 in. (610 mm) shall benot less than that specified in Table 2.9.2 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 s
22、epara-tion of the jaws of the testing machine shall be approximately2 ft (0.61 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. from the jaws of the testing machine. Ad
23、ditionalsamples shall be taken from the same coil or reel when theprevious tests are to be disregarded.9.3 Elongation tests shall be made on lengths of strand thatdo not contain wire joints or splices.10. Dimensions and Permissible Variations of Wires10.1 The diameter of the aluminum-coated wire for
24、ming thestrand specified in Table 1 shall be within the limits prescribedin Table 3.11. Sampling11.1 Perform sampling for determination of compliance tothis specification on each lot of material. A lot shall consist ofTABLE 1 Physical Properties of Aluminum-Coated Steel Wire StrandNominalDiameterof
25、Strand,in. (mm)Numberof WiresinStrandNominalDiameterof CoatedWires inStrand, in.(mm)ApproximateWeight ofStrand,lb/1000 ft(kg/m)Minimum Breaking Strength of Strand, lbf (kN)Utilities GradeACommonGradeSiemens-MartinGradeHigh-StrengthGradeExtra-High-StrengthGrade316 (4.76) 7 0.062 (1.57) 73 (0.108) . .
26、 . . . . 1 150 (5.1) 1 900 (8.5) 2 850 (12.7) . . . . . .316 (4.76) 7 0.065 (1.65) 80 (0.118) 2 400 (10.7) (1)B. . . . . . . .14 (6.35) 3 0.120 (3.05) 117 (0.173) 3 150 (14.0) (2) . . . . . . . . . . . . . . . . . . . . . . . .14 (6.35) 3 0.120 (3.05) 117 (0.173) 4 500 (20.0) (3) . . . . . . . . . .
27、 . . . . . . . . . . . . . .14 (6.35) 7 0.080 (2.03) 121 (0.179) . . . . . . 1 900 (8.5) 3 150 (14.0) 4 750 (21.1) 6 650 (29.6)932 (7.14) 7 0.093 (2.36) 164 (0.243) 4 600 (20.5) (1) . . . . . . . . . . . . . . . . . . . . . . . .516 (7.94) 3 0.145 (3.68) 171 (0.253) 6 500 (28.9) (3) . . . . . . . .
28、. . . . . . . . . . . . . . . .516 (7.94) 7 0.104 (2.64) 205 (0.303) . . . . . . 3 200 (14.2) 5 350 (23.8) 8 000 (35.6) 11 200 (49.8)516 (7.94) 7 0.109 (2.77) 225 (0.333) 6 000 (26.7) (1) . . . . . . . . . . . . . . . . . . . . . . . .38 (9.52) 3 0.165 (4.19) 220 (0.326) 8 500 (37.8) (3) . . . . . .
29、 . . . . . . . . . . . . . . . . . .38 (9.52) 7 0.120 (3.05) 273 (0.404) 11 500 (51.2) (4) 4 250 (18.9) 6 950 (30.9) 10 800 (48.0) 15 400 (68.5)716 (11.11) 7 0.145 (3.68) 399 (0.591) 18 000 (80.1) (4) 5 700 (25.4) 9 350 (41.6) 14 500 (64.5) 20 800 (92.5)12 (12.7) 7 0.165 (4.19) 517 (0.765) 25 000 (1
30、11.2) (4) 7 400 (32.9) 12 100 (53.8) 18 800 (83.6) 26 900(119.7)AThe utilities grade is used principally by communication and power and light industries.BThe last numbers in parentheses refer to elongation requirements specified in Section 9.TABLE 2 Elongation Requirements for Grades of StrandGrade
31、of StrandElongation in 24in. or 610 mm,min, %Utilities (1)Aand common strand 10Utilities (2)Aand Siemens-Martin 8Utilities (3)Aand high-strength 5Utilities (4)Aand extra-high-strength 4ASee Table 1, Footnote B.TABLE 3 Permissible Variations in Diameter of Aluminum-CoatedWiresANominal Diameter of Coa
32、ted Wires inthe Strand, in. (mm)Permissible Variations,plus and minus,in. (mm)0.061 to 0.090 (1.55 to 2.29) 0.003 (0.08)0.091 to 0.120 (2.31 to 3.05) 0.004 (0.10)0.121 and over (3.07 and over) 0.005 (0.13)AIt is recognized that the surface of aluminum coatings, particularly thoseproduced by hot dipp
33、ing, is not perfectly smooth and devoid of irregularities. If thetolerances shown in this table are rigidly applied to such irregularities that areinherent to the product, unjustified rejections of wire that would actually besatisfactory for use could occur. Therefore, it is intended that these tole
34、rances beused in gaging the uniform areas of the aluminum-coated wire.A474 03 (2017)2all the strand of one size and one grade in each shipment. Thenumber of samples to be taken shall be as follows:Number ofSamples5000 ft (1525 m) or less 1Over 5000 to 30 000 ft (1525 to 9145 m) 2Over 30 000 to 150 0
35、00 ft (9145 to 45 720 m) 3Over 150 000 ft (45 720 m) 411.2 Each sample taken shall be subjected to all testsprescribed in this specification.12. Weight of Coating12.1 The weight of aluminum coating, in ounces per squarefoot or kilograms per square metre, of uncoated wire surface,on any individual wi
36、re of the completed strand shall be not lessthan that specified in Table 4.13. Tests of Coating13.1 Determine the weight of the aluminum coating inaccordance with Test Method A428/A428M.14. Adherence of Coating14.1 The aluminum-coated wire shall be capable of beingwrapped at a rate not exceeding 15
37、turns per minute in a closehelix of at least two turns around a cylindrical mandrel equal tothree times the nominal diameter of the wire under test, withoutcracking or flaking the aluminum coating to such an extent thatany aluminum can be removed by rubbing with the barefingers. Loosening or detachm
38、ent during the adhesion test ofsuperficial, small particles of aluminum formed by mechanicalpolishing of the surface of aluminum-coated wire shall not beconsidered cause for rejection.15. Ductility of Steel15.1 The individual wires of the completed strand shall notfracture when wrapped at a rate not
39、 exceeding 15 turns perminute in a close helix of at least two turns around a cylindricalmandrel. The mandrel diameter for testing common- andSiemens-Martin-grade strand shall be equal to the nominaldiameter of the individual wires of the strand. The mandreldiameter for utilities, high-strength, and
40、 extra-high-strengthgrade strand, shall be equal to three times the nominal diameterof the individual wires of the strand.16. Finish16.1 The aluminum-coated wire shall be free of imperfec-tions not consistent with good commercial practice. Thecoating shall be continuous and reasonably uniform.17. In
41、spection17.1 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable facilities, without charge, tosatisfy him that the material is being furnished in accordancewith this specification. All tests and inspection shall be made atthe place of manufacture prior to shipment
42、, unless otherwisespecified, and shall be so conducted as not to interfereunnecessarily with the operation of the works.18. Rejection18.1 If the wire or strand fails in the first test to meet anyrequirement of this specification, two additional tests shall bemade on samples of wire or strand from th
43、e same coil or reel.If failure occurs in either of these tests, the lot of wire or strandshall be rejected.19. Packaging and Marking19.1 Wire strand shall be furnished in standard lengths,(19.1.1) and in compact coils or on reels (19.1.2) as specifiedby the purchaser; otherwise lengths shall be as a
44、greed upon atthe time of purchase. Only one length of strand shall befurnished in each coil or on each reel. Lengths of strand mayvary between the standard (nominal) length and 10 % over thestandard (nominal) length, unless otherwise specified by thepurchaser.19.1.1 Standard lengths of strand are as
45、 follows: 250, 500,1000, 2500, and 5000 ft (75, 150, 305, 760, and 1525 m).19.1.2 Standard practice is to furnish all strand716 in. (11.11mm) and over in diameter on reels in lengths of 1000 ft andover. Strand lengths of less than 1000 ft are regularly furnishedin coils.19.2 Each coil or reel shall
46、have a strong weather-resistanttag securely fastened to it showing the length, nominaldiameter, number of wires, grade of the strand, ASTM desig-nation A474, and the name or mark of the manufacturer. Ifadditional information is required on the tag, it shall be sospecified at the time of purchase.20.
47、 Keywords20.1 aluminum-coated steel wire strand; wire strandTABLE 4 Nominal Diameters and Minimum Weights of Coatingfor Aluminum-Coated Steel WiresNominal Diameter of CoatedWire in the Strand, in. (mm)Minimum Weight of Alumi-num Coating, oz/ft2(g/m2)of Uncoated Wire Surface0.062 (1.57) 0.30 (92)0.06
48、5 (1.65) 0.30 (92)0.080 (2.03) 0.30 (92)0.093 (2.36) 0.32 (98)0.104 (2.64) 0.32 (98)0.109 (2.77) 0.35 (107)0.120 (3.05) 0.35 (107)0.145 (3.68) 0.35 (107)0.165 (4.19) 0.40 (122)A474 03 (2017)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with
49、 any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will
