1、Designation: A 855/A 855M 03Standard Specification forZinc-5 % Aluminum-Mischmetal Alloy-Coated Steel WireStrand1This standard is issued under the fixed designation A 855/A 855M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers five grades of zinc-5 %aluminum-mischmetal (Zn-5 Al-MM) alloy-coated, steel wirest
3、rand, 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 are as follo
4、ws: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 alloy aredescr
5、ibed in Section 10.1.4 This specification is applicable to orders in eitherinch-pound units (as A 855) or acceptable SI units (asA 855M). Inch-pound units and SI units are not necessarilyequivalent.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight of Coating on Zinc-Coated
6、 (Galvanized) Iron or Steel ArticlesA 902 Terminology Relating to Metallic Coated Steel Prod-uctsB 750 Specification for Zinc-5 % Aluminum-MischmetalAlloy (UNS Z 38510) in Ingot Form for Hot-Dip CoatingsE 47 Method for Chemical Analysis of Zinc Die-CastingAlloysE 1277 Test Method for Chemical Analys
7、is of Zinc-5 %Aluminum-Mischmetal Alloy by ICP Argon Plasma Spec-trometric Method2.2 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)33. Terminology3.1 DefinitionsFor definitions of terms used in this spe
8、ci-fication 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 and the minimum breaking strength ofthe strand (see Section 7), a
9、nd 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 strength of strand (Section 6 and
10、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 A 855 for inchpound and A 855M for SI units.5. Materials and Manufacture5.1 Base MetalThe base metal shall be ste
11、el 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 Coated Iron and Steel Produ
12、cts and is the direct responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition approved October 1, 2003. Published December 2003. Originallyapproved in 1986. Last previous edition approved in 1998 as A 855/A 855M 98.2For referenced ASTM standards, visit the ASTM website, www.astm.
13、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.3Available from International Lead Zinc Research Organization, 2525 MeridianParkway, P.O. Box 12036, Research Triangle Park, N
14、C 27709-2036.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.individual wires shall be of uniform quality and have theproperties and characteristics as prescribed in t
15、his 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 B 750.5.2.1 For a two-step coating operation where the firstcoating is zinc (hot-dip galvanized or electrogalvanized) t
16、hefinal 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 chemi-cal (see Test Method E 47 for tin) ICP Argon Plasma Spectro-metric (see T
17、est Method E 1277) or other methods. In case ofdispute, the results secured by Test Method E 1277 shall be thebasis of acceptance.5.2.3 A standard practice of X-ray fluorescence spectrom-etry for determination of cerium and lanthanum in a zinc-5 %aluminum-mischmetal alloy has been established by the
18、 Inter-national Lead Zinc Research Organization (see Standard Prac-tice GF-1). In case of dispute, the results secured by TestMethod E 1277 shall be the basis of acceptance.6. Stranding6.1 Unless otherwise specified, strand shall have a left lay. Aleft lay is defined as a counter-clockwise twist awa
19、y from theTABLE 1 Physical Properties of Zn-5 Al-MM Alloy-Coated Steel Wire StrandNOTEThe numbers in boldface indicate sizes and grades most commonly used and readily available.NominalDiameter ofStrand, in.mmNum-ber ofWiresinStrandNominalDiameter ofCoatedWires inStrand,in. mmApproximateWeight ofStra
20、nd,lb/1000 ftkg/kmMinimum Breaking Strength of Strand, lbf kNUtilitiesGradeACommonGradeSiemens-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 13.0783
21、16 4.76 7 0.062 1.57 73 109 . . . 1 150 5.115 1 900 8.452 2 850 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
22、 3 0.120 3.05 117 174 3150 14.012 (2)B1860 8.274 3040 13.523 4730 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
23、.14 7 0.093 2.36 164 244 4600 20.462 (1)B2570 11.432 4250 18.905 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
24、 26.689 (1)B. . . .38 9.52 3 0.165 4.19 220 328 8500 37.810 (3)B3330 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
25、 800 92.52312 12.70 7 0.165 4.19 517 770 25 000 111.206 (4)B7400 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.
26、113 2.87 637 949 . 9640 42.881 16 100 71.616 24 100107.20233 700149.90558 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 71.1
27、72 26 200 116.543 40 800181.48758 300259.33178 22.22 19 0.177 4.50 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
28、 71 900319.827102 700456.832118 28.58 37 0.161 4.09 2691 4010 . . . 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
29、industries.BRefer to enlongation requirements specified in Section 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 Gra
30、de (4)Aand Extra High-Strength 4ASee Table 1, Footnote B.A 855/A 855M 032observer. 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.6.2 The 3-wire strand shall co
31、nsist 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 concentrically twisted over it with a uniform pitchof not more than 16 times
32、 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 nominaldiameter of this 7-wire core. The nominal diameter of this7-wire core shall
33、 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 specifiednominal diameter of the strand.6.5 The 37-wire strand shall consist of
34、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 shall be considered to be three times the nominaldiameter of the wire. An interm
35、ediate 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 19-wire core shall be considered as five times thenominal diameter of the wir
36、es. 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 strand shall lie naturally in their truepositions in the completed strand and, w
37、hen 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. Breaking Strength and Weight7.1 The approximate weight per unit length of strand and
38、the 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 within 1 in. 25
39、.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. 610 mm shall ben
40、ot 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-tion of the jaws of
41、 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 over 1in. from the jaws of the testing machine. Additional samplesshall be taken from
42、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 shall not fracturewhen wrapped at a rate not exceeding 15 turns per minute in
43、 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 mandrel diameter forUtilities, High-Strength, and Extra-High Strength Gradestrand,
44、 shall be equal to three times the nominal diameter of theindividual wires of the strand.10. Weight of Coating10.1 The weight of Zn-5 Al-MM alloy-coating shall be notless than specified in Table 2.10.2 The weight of the Zn-5 Al-MM coating shall bedetermined by a stripping test in accordance with Tes
45、t MethodA 90/A 90M.TABLE 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 BCClass CC0.041 1.04 0.15 46 0.40 122 0.80 244 1.20 36
46、60.052 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 0.70 214 1.40 427 2.10 6410.100 2.54 0.30 92 0.70 214 1
47、.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 3.30 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
