1、Designation: A855/A855M 03 (Reapproved 2014)Standard Specification forZinc-5 % Aluminum-Mischmetal Alloy-Coated Steel WireStrand1This standard is issued under the fixed designation A855/A855M; the number immediately following the designation indicates the yearof original adoption or, in the case of
2、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. Scope1.1 This specification covers five grades of zinc-5 %aluminum-mischmetal (Zn-5 Al-MM) alloy-coated,
3、steel wirestrand, composed of a number of round, steel wires, with fourweights of Zn-5 Al-MM alloy coatings, suitable for use asguys, messengers, span wires, and for similar purposes. Theproduct is intended for applications requiring corrosion resis-tance and formability.1.2 The five grades covered
4、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,1.2.6 Minimum breaking strengths of strand for each gradeare described in Section 7.1.3 The four weights of coatings are: Class1 and Classes A,B, and C. Minimum weights of Zn-5 Al-MM al
5、loy aredescribed in Section 10.1.4 This specification is applicable to orders in eitherinch-pound units (as A855) or acceptable SI units (as A855M).Inch-pound units and SI units are not necessarily equivalent.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating
6、onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsB750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys (Withdrawn 1997
7、)3E1277 Test Method for Chemical Analysis of Zinc-5 %Aluminum-Mischmetal Alloys by ICP Emission Spec-trometry2.2 Other Standard:GF-1 Standard Practice for Determination of Cerium andLanthanum Compositions in Galfan Alloy (5-Al-0.04 %La-0.04 % Ce-Bal SHG Zn)43. Terminology3.1 DefinitionsFor definitio
8、ns of terms used in this speci-fication refer to Terminology A902.3.2 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 and the minimum breaking strength ofth
9、e strand (see Section 7), and the class of coating (see Section10).4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of strand in feet metres,4.1.2 Nominal strand diameter, number of wires, grade, andminimum breaking strengt
10、h of strand (Section 6 and Table 1),4.1.3 Weight (class) of Zn-5 Al-MM alloy coating (Section10 and Table 2), and4.1.4 Length of strand in coils or on reels (Section 18).4.1.5 ASTM designation and year of issue as A855 for inchpound and A855M for SI units.5. Materials and Manufacture5.1 Base MetalTh
11、e base metal shall be steel made by anycommercially accepted steel making process and of suchquality and purity that, when drawn to the size of wire specifiedand coated with Zn-5 Al-MM alloy, the finished strand and the1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Co
12、ated Iron and Steel Productsand is the direct responsibility of Subcom-mittee A05.12 on Wire Specifications.Current edition approved Aug. 1, 2014. Published August 2014. Originallyapproved in 1986. Last previous edition approved in 2009 as A855/A855M 03 (2009). DOI: 10.1520/A0855_A0855M-03R14.2For r
13、eferenced 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.3The last approved version of this historical standard is reference
14、d onwww.astm.org.4Available from International Lead Zinc Research Organization, 2525 MeridianParkway, P.O. Box 12036, Research Triangle Park, NC 27709-2036.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1individual wires shall be of u
15、niform quality and have theproperties and characteristics as prescribed in this specifica-tion.5.2 Coating Bath AnalysisThe bath metal used in continu-ous hot-dip Zn-5 Al-MM alloy-coating shall meet the chemicalcomposition limits specified in Specification B750.5.2.1 For a two-step coating operation
16、 where the firstcoating is zinc (hot-dip galvanized or electrogalvanized) thefinal bath may have an aluminum content of up to 7.2 %, toprevent depletion of the aluminum content of the bath.5.2.2 Method of AnalysisThe determination of chemicalcomposition shall be made in accordance with suitable chem
17、i-cal (see Test Method E47 for tin) ICP Argon Plasma Spectro-metric (see Test Method E1277) or other methods. In case ofdispute, the results secured by Test Method E1277 shall be thebasis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium and lant
18、hanum in a zinc-5 %aluminum-mischmetal alloy has been established by the Inter-national Lead Zinc Research Organization (see Standard Prac-tice GF-1). In case of dispute, the results secured by TestMethod E1277 shall be the basis of acceptance.TABLE 1 Physical Properties of Zn-5 Al-MM Alloy-Coated S
19、teel Wire StrandNOTE 1The numbers in boldface indicate sizes and grades most commonly used and readily available.NominalDiameter ofStrand, in.mmNum-ber ofWiresinStrandNominalDiameter ofCoatedWires inStrand,in. mmApproximateWeight ofStrand,lb/1000 ftkg/kmMinimum Breaking Strength of Strand, lbf kNUti
20、litiesGradeACommonGradeSiemens-MartinGradeHigh-StrengthGradeExtra High-StrengthGrade18 3.18 7 0.041 1.04 32 48 . . . 540 2.402 910 4.048 1330 5.916 1830 8.140532 3.97 7 0.052 1.32 51 76 . . . 870 3.870 1470 6.539 2140 9.519 2940 13.078316 4.76 7 0.062 1.57 73 109 . . . 1 150 5.115 1 900 8.452 2 850
21、12.677 3 990 17.748316 4.76 7 0.065 1.65 80 119 2400 10.676 (1)B. . . .732 5.56 3 0.104 2.64 88 131 . 1400 6.228 2340 10.409 3500 15.569 4900 21.796732 5.56 7 0.072 1.83 98 146 . 1 540 6.850 2 560 11.387 3 850 17.126 5 400 24.02014 6.35 3 0.120 3.05 117 174 3150 14.012 (2)B1860 8.274 3040 13.523 473
22、0 21.040 6740 29.98114 6.35 3 0.120 3.05 117 174 4500 20.017 (3)B. . . .14 6.35 7 0.080 2.03 121 180 . . . 1900 8.452 3150 14.012 4750 21.129 6650 29.581932 7.14 3 0.130 3.30 137 204 . 2080 9.252 3380 15.035 5260 23.398 7500 33.362932 7.14 7 0.093 2.36 164 244 4600 20.462 (1)B2570 11.432 4250 18.905
23、 6400 28.469 8950 39.812516 7.94 3 0.145 3.68 171 255 6500 28.913 (3)B2490 11.076 4090 18.193 6350 28.246 9100 40.479516 7.94 7 0.104 2.64 205 305 . . . 3200 14.234 5350 23.798 8000 35.586 11 200 49.820516 7.94 7 0.109 2.77 225 335 6000 26.689 (1)B. . . .38 9.52 3 0.165 4.19 220 328 8500 37.810 (3)B
24、3330 14.813 5560 24.732 8360 37.187 11 800 52.48938 9.52 7 0.120 3.05 273 407 11 500 51.155 (4)B4250 18.905 6950 30.915 10 800 48.040 15 400 68.503716 11.11 7 0.145 3.68 399 595 18 000 80.068 (4)B5700 25.355 9350 41.591 14 500 64.499 20 800 92.52312 12.70 7 0.165 4.19 517 770 25 000 111.206 (4)B7400
25、 32.917 12 100 53.823 18 800 83.627 26 900119.65712 12.70 19 0.100 2.54 504 751 . 7620 33.895 12 700 56.492 19 100 84.961 26 700118.768916 14.29 7 0.188 4.78 671 1000 . 9600 42.703 15 700 69.837 24 500108.98135 000155.688916 14.29 19 0.113 2.87 637 949 . 9640 42.881 16 100 71.616 24 100107.20233 700
26、149.90558 15.88 7 0.207 5.26 813 1211 . 11 600 51.599 19 100 84.961 29 600131.66742 400188.60558 15.88 19 0.125 3.18 796 1186 . . . 11 000 48.930 18 100 80.513 28 100124.99540 200178.81934 19.05 19 0.150 3.81 1155 1721 . . . 16 000 71.172 26 200 116.543 40 800181.48758 300259.33178 22.22 19 0.177 4.
27、50 1581 2356 . . . 21 900 97.416 35 900 159.691 55 800248.21179 700354.5231 25.40 19 0.200 5.08 2073 3089 . . . 28 700 127.664 47 000 209.066 73 200325.610104 500464.8391 25.40 37 0.143 3.63 2057 3065 . . . 28 300 125.885 46 200 205.508 71 900319.827102 700456.832118 28.58 37 0.161 4.09 2691 4010 .
28、. . 36 000160.136 56 900 262.000 91 600407.457130 800581.827114 31.75 37 0.179 4.55 3248 4840 . . . 44 600 198.391 73 000 324.720 113 600505.318162 200721.502AThe utilities grade is used principally by communication and power and light industries.BRefer to enlongation requirements specified in Secti
29、on 8.TABLE 2 Elongation Requirements for Grades of StrandGrade of StrandElongationin 24 in.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, Footnote B.A855/A8
30、55M 03 (2014)26. 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 sufficiently close to ensure no appreciablereduction in diameter when st
31、ressed 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 20 times the specified nominal diameter of thestrand.6.3 The 7-wire strand shall consist of a center wire with a6-wire layer
32、 concentrically twisted over it with a uniform pitchof not more than 16 times 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 16 times the nomin
33、aldiameter of this 7-wire core. The nominal diameter of this7-wire core shall be considered to be three times the nominaldiameter of the wires. A 12-wire outer layer, having a left layshall be concentrically twisted over the 7-wire core and shallhave a uniform pitch of not more than 16 times the spe
34、cifiednominal diameter 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 16 times the nominal diameterof this 7-wire inner core. The nominal diameter of this 7-wireinner core sha
35、ll be considered to be three times the nominaldiameter of the wire. An intermediate layer of 12 wires havinga right lay shall be concentrically twisted over this 7-wire coreand shall have a uniform pitch of not more than 16 times thenominal diameter of this 19-wire core. The nominal diameterof this
36、19-wire core shall be considered as five times thenominal diameter of the wires. An 18-wire outer layer, havinga left lay shall be concentrically twisted over the 19-wire coreand shall have a uniform pitch of not more than 16 times thespecified nominal diameter of the strand.6.6 All wires in the str
37、and shall lie naturally in their truepositions in the completed strand and, when the strand is cut,the ends shall remain in position to 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. Breakin
38、g Strength and Weight7.1 The approximate weight 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 t
39、he jaws of the testing machine, bybreaking within 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 spl
40、ices.8. Elongation8.1 The elongation of the strand 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 thepositio
41、n at the initial failure in the test specimen. The 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 that break over1 in.
42、 from the jaws of the testing machine. Additional 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 strand thatdo not contain wire joints or splices.9. Ductility of Steel9.1 The Zn-5 Al-MM alloy-coated wire
43、shall not fracturewhen wrapped at a rate not exceeding 15 turns per minute in aclose helix of at least two turns around a cylindrical mandrel.The mandrel diameter for testing Common and Siemens-Martin Grade strand shall be equal to the nominal diameter ofthe individual wires of the strand. The mandr
44、el diameter forUtilities, High-Strength, and Extra-High Strength GradeTABLE 3 Nominal Diameters and Minimum Weights of Coatingfor Zn-5 Al-MM Alloy-Coated Steel WiresANominalDiameter ofCoated Wire inthe Strand,in. mmMinimum Weight of Coating, oz/ft2g/m2ofUncoated Wire SurfaceClass 1BClass ACClass BCC
45、lass CC0.041 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 4580.080 2.03 0.30 92 0.60 183 1.20 366 1.80 5490.093 2.36 0.30 92 0.70
46、 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 1.70 519 2.55 7780.125 3.18 0.30 92 0.85 259 1.70 519 2.55 7780.130 3.
47、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 0.40 122 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
