1、Designation: B 355 06Standard Specification forNickel-Coated Soft or Annealed Copper Wire1This standard is issued under the fixed designation B 355; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r in parentheses 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. Scope1.1 This specification covers nickel-coated, soft or an-nealed
3、, round copper wire for use in electrical equipment.1.2 Five classes of wire are covered as follows:1.2.1 Class 2Wire whose nickel coating is at least 2 % ofthe total weight of the coated wire.1.2.2 Class 4Wire whose nickel coating is at least 4 % ofthe total weight of the coated wire.1.2.3 Class 7W
4、ire whose nickel coating is at least 7 % ofthe total weight of the coated wire.1.2.4 Class 10Wire whose nickel coating is at least 10 %of the total weight of the coated wire.1.2.5 Class 27Wire whose nickel coating is at least 27 %of the total weight of the coated wire.NOTE 1For information purposes,
5、 the thickness of coating in micro-inches provided by the percentages listed in 1.2 is shown in Table 1.1.3 The SI values for density and resistivity are to beregarded as the standard. For all other properties the inch-pound values are to be regarded as the standard and the SI unitsmay be approximat
6、e.1.4 This hazard statement applies only to Section 6, TestMethods, and to the Appendix of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and
7、 healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 The following documents of the issue in effect at thetime of reference form a part of these methods to the extentreferenced herein:2.2 ASTM Standards:2B49 Specification for Copper Rod
8、Drawing Stock forElectrical PurposesB 193 Test Method for Resistivity of Electrical ConductorMaterialsB 258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Usedas Electrical ConductorsE75 Test Methods for Chemical Analysis of Copper-Nickeland Copper-Ni
9、ckel-Zinc Alloys2.3 NIST:NBS Handbook 100Copper Wire Tables33. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),3.1.3 Class of coating (Section 1 and Table
10、 1),3.1.4 Type of copper, if special (see 4.2),3.1.5 Package size (Section 10),3.1.6 Special packaging marking, if required, and3.1.7 Place of inspection (see 9.1).4. Material4.1 The material shall be nickel-coated wire (ExplanatoryNote 1), of such quality and purity that the finished productshall h
11、ave the properties and characteristics prescribed in thisspecification.NOTE 2Specification B49defines copper suitable for use:4.2 Copper of special qualities, forms, or types, as may beagreed upon between the manufacturer and the purchaser, andwhich will conform to the requirements prescribed in thi
12、sspecification may also be used.5. General Requirements General Requirements5.1 Tensile PropertiesThe nickel-coated wire shall con-form to the requirements for elongation as prescribed in Table1. For wire, the nominal diameter of which is more than 0.0011This specification is under the jurisdiction
13、of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of B01.04 on Conductors ofCopper and Copper Alloys.Current edition approved Oct. 1, 2006. Published October 2006. Originallyapproved in 1960. Last previous edition approved in 2003 as B 355 95 (2003).2For referenced ASTM
14、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.3Available from National Technical Information Service (NTIS), 5285 PortRoyal Rd.,
15、 Springfield, VA 22161, http:/www.ntis.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.in. (1 mil) greater than a size listed in Table 1 and less than thatof the next larger size, the requirements of the next larger sizeshall app
16、ly.5.2 ResistivityThe electrical resistivity of the coated wireat a temperature of 20C shall not exceed the values prescribedin Table 2.5.3 Dimensions and Permissible VariationsThe wire sizesshall be expressed as the diameter of the wire in decimalfractions of an inch to the nearest 0.1 mil (0.0001
17、in.)(Explanatory Note 2). The coated wire shall not vary from thespecified diameter by more than the following amounts:Nominal Diameter, in. Permissible Variations in DiameterUnder 0.0100 +0.0003 in. (0.3 mil)0.0001 in. (0.1 mil)0.0100 to 0.0508, inclOver 0.0508+3 %, 1 %+0.0015, 0.00055.4 Continuity
18、 of CoatingThe coating shall be continu-ous. The continuity of the coating shall be determined onrepresentative samples taken before stranding or insulating andshall be determined by the sodium polysulfide test described in6.4. Wire whose coating weight corresponds to a thickness ofless than 50 in.
19、(0.00005 in.) (0.0013 mm) shall not be subjectto this test (Explanatory Note 3).5.5 Adherence of CoatingThe nickel coating shall befirmly adherent to the surface of the copper. The adherence ofcoating on the wire shall be determined on representativesamples. The adherence of coating shall be determi
20、ned by thewrapping and immersion test in accordance with 6.5.5.6 Weight of CoatingThe weight of coating expressed asa percentage of the total weight of the wire shall be not lessthan 2 % for Class 2; 4 % for Class 4; 7 % for Class 7; 10 %for Class 10; and 27 % for Class 27. For ease of comparison,TA
21、BLE 1 Tensile RequirementsArea at 20C (68F)Elongation in10 in., min,%Thickness of Coating, in.(For Information Only)Diameter,in.cmils in.2Classes2, 4, 7,9, and 10Class27Class 2,2%NickelClass 4,4%NickelClass 7,7%NickelClass 10,10 %NickelClass 27,27 %Nickel0.1285 16 510 0.01297 25 20 650 1300 2290 330
22、0 93500.1144 13 090 0.01028 25 20 570 1160 2040 2940 83300.1019 10 380 0.008155 25 20 510 1040 1820 2620 74200.0907 8 230 0.00646 25 20 460 920 1620 2330 66100.0808 6 530 0.00513 25 20 410 820 1440 2070 58800.0720 5 180 0.00407 25 20 360 730 1280 1850 52400.0641 4 110 0.00323 25 20 320 650 1140 1650
23、 46700.0571 3 260 0.00256 25 20 290 580 1020 1470 41600.0508 2 580 0.00203 25 20 260 510 910 1300 37000.0453 2 050 0.00161 25 20 230 460 810 1160 33000.0403 1 620 0.00128 25 20 200 410 720 1030 29300.0359 1 290 0.00101 25 20 180 360 640 920 26100.0320 1 020 0.000804 25 20 160 320 570 820 23300.0285
24、812 0.000638 25 20 140 290 510 730 20700.0253 640 0.000503 25 20 130 260 450 650 18500.0226 511 0.000401 25 20 110 230 400 580 16400.0201 404 0.000317 20 15 100 200 360 520 14600.0179 320 0.000252 20 15 90 180 320 460 13000.0159 253 0.000199 20 15 80 160 280 410 11600.0142 202 0.000158 20 15 71 140
25、250 360 10300.0126 159 0.000125 20 15 63 130 220 320 9200.0113 128 0.000100 20 15 57 110 200 290 8200.0100 100 0.0000785 20 15 50 100 180 260 7300.0089 79.2 0.0000622 15 10 45 90 160 230 6500.0080 64.0 0.0000503 15 10 40 81 140 200 5800.0071 50.4 0.0000396 15 10 . 72 130 180 5200.0063 39.7 0.0000312
26、 15 10 . 64 110 160 4600.0056 31.4 0.0000246 15 10 . 57 100 140 4100.0050 25.0 0.0000196 15 10 . 51 89 130 3600.0045 20.2 0.0000159 15 8 . . 80 120 3200.0040 16.0 0.0000126 15 8 . . 71 100 2900.0035 12.2 0.00000962 15 8 . . 62 91 2600.0031 9.61 0.00000755 15 8 . . 55 81 230TABLE 2 Electrical Resisti
27、vity RequirementsClass, % NickelResistivity at 20C,V lb/mile22 911.674 931.067 961.7610 994.5527 1232.7B355062the thickness of coating for these classes has been included inTable 1 (Explanatory Note 3).5.7 JointsNecessary joints in the wire and rods prior tofinal coating and drawing shall be made in
28、 accordance with thebest commercial practice. There shall be no uncoated joints inthe final product.5.8 FinishThe coating shall consist of a smooth, continu-ous layer, firmly adherent to the surface of the copper. The wireshall be free from all imperfections not consistent with the bestcommercial pr
29、actice.6. Test Methods6.1 ElongationThe elongation of wire whose nominaldiameter is larger than 0.0808 in. (2.052 mm) shall bedetermined as the permanent increase in length at fracture,expressed as a percentage of the original length, due to thebreaking of the wire in tension, measured between gage
30、marksplaced originally 10 in. (254 mm) apart on the test specimen(Explanatory Note 4). The elongation of wire whose nominaldiameter is 0.0808 in. (2.052 mm) and under may be deter-mined as just described or by measurements made between thejaws of the testing machine. Where the latter method is used,
31、the zero length shall be the distance between the jaws at thestart of the tension test and be as near 10 in. (254 mm) aspracticable; the final length shall be the distance between thejaws at the time of rupture. The fracture shall be between gagemarks in the case of specimens so marked, or between t
32、he jawsof the testing machine and not closer than 1 in. (25.4 mm) toeither gage mark or either jaw.6.2 ResistivityThe electrical resistivity of the materialshall be determined in accordance with Test Method B 193(Explanatory Note 5).6.3 Dimensional MeasurementsDimensional measure-ments shall be made
33、 with a micrometer caliper equipped witha vernier graduated in 0.0001 in. Each coil shall be gaged atthree places, one near each end and one near the middle. Fromeach spool approximately 12 ft (3.7 m) shall be unreeled andthe wire gaged in six places between the second and twelfthfoot from the end.
34、The average of the measurements obtainedshall meet the requirements of 5.3.6.4 Continuity of Coating:6.4.1 Length of SpecimensTest specimens shall each havea length of about 6 in. (152 mm). They shall be tagged ormarked to correspond with the coil, spool, or reel from whichthey were cut.6.4.2 Treatm
35、ent of SpecimensThe specimens shall bethoroughly cleaned by immersion in a suitable organic solventfor at least 3 min, then removed and wiped dry with a clean,soft cloth or tissue (Precaution: Explanatory Note 6). Thespecimens thus cleaned shall be kept wrapped in a clean, drycloth or tissue until t
36、ested. That part of the specimen to beimmersed in the test solution shall not be handled. Care shallbe taken to avoid abrasion by the cut ends.6.4.3 Special Solution (sp gr 1.142)A concentrated solu-tion shall be made by dissolving sodium sulfide crystals (cp) indistilled water until the solution is
37、 saturated at about 21C, andadding sufficient flowers of sulfur (in excess of 250 g/L ofsolution) to provide complete saturation, as shown by thepresence in the solution of an excess of sulfur after the solutionhas been allowed to stand for at least 24 h. The test solutionshall be made by diluting a
38、 portion of the concentrated solutionwith distilled water to a specific gravity of 1.135 to 1.145 atambient temperature of 15.6 C. The sodium polysulfide testsolution should have sufficient strength to thoroughly blackena piece of clean uncoated copper wire in 5 s. A portion of thetest solution used
39、 for testing samples shall not be considered tobe exhausted until it fails to blacken a piece of clean copper asdescribed above (Explanatory Note 7).6.4.4 ProcedureImmerse a length of at least 412 in. (114mm) from each of the clean specimens for 30 s in the sodiumpolysulfide solution (see 6.4.3) mai
40、ntained at a temperaturebetween 15.6 and 21C. After the immersion, immediatelywash the specimens in clean water and wipe dry with a clean,soft cloth or tissue. After immersion and washing, examine thespecimens to ascertain if copper exposed through openings inthe nickel coating has been blackened by
41、 action of the sodiumpolysulfide. Examine the specimen with the normal eye againsta white background. Consider the specimens to have failed if,by such blackening, exposed copper is revealed. No attentionshall be paid to blackening within 0.5 in. (12.7 mm) of the cutend.6.5 Adherence of Coating:6.5.1
42、 SpecimensTest specimens shall be approximately 12in. (305 mm) in length and shall be tagged or marked tocorrespond with the coil, spool, or reel from which they are cut.The specimens shall be thoroughly cleaned, if required, byimmersion in a suitable organic solvent for at least 3 min, thenremoved
43、and dried (Precaution: Explanatory Note 6). Thespecimens thus cleaned shall be kept wrapped in a clean, drycloth until tested. That part of the specimen to be immersed inthe test solution shall not be handled. Care shall be taken toavoid abrasion of the surface to be subjected to test. Wire sizes0.0
44、05 in. (0.127 mm) and smaller may be cleaned afterwrapping.6.5.2 Procedure:6.5.2.1 WrappingSlowly wrap the test specimen in asuitable manner in an open helix around a wire of its owndiameter. Take care not to stretch the specimen during thewrapping operation. The spacing of the consecutive turns sha
45、llbe approximately equal to the diameter of the wire. For wiresizes 0.021 in. (0.533 mm) and smaller, use approximately sixhelical turns for the test. For wire larger than 0.021 in. (0.533mm) use approximately three turns.6.5.2.2 Immersion TestRemove the helically wrappedportion of the test specimen
46、 from the mandrel and completelyimmerse in the sodium polysulfide solution (see 6.4.3) for 30 sat the temperature prescribed in 6.4.4. On removal from thesodium polysulfide solution, rinse the specimen immediately inclean water and remove the excess by shaking.6.5.2.3 Examination of SpecimensExamine
47、 the outer sur-face of the helically wrapped portion of the specimen undermagnification not to exceed 73 diameter. Any cracking orflaking of the coating in this area shown by blackening of thecopper area shall be cause for rejection. A grayish appearanceof the coating after immersion shall not const
48、itute failure.6.6 Weight of CoatingConformance to the weight require-ment may be determined in accordance with Test Method A. InB355063case of disagreement, Test Method B shall be used and theresult obtained shall be final. Test Methods A and B are givenin Appendix X1.6.7 FinishSurface-finish inspec
49、tion shall be made withthe unaided eye (normal spectacles excepted).7. Conformance Criteria (Explanatory Note 6)7.1 Any lot of wire, the samples of which comply with theconformance criteria of this section, shall be considered ascomplying with the requirements of Section 5. Individualproduction units that fail to meet one or more of the require-ments shall be rejected. Failure of a sample group from a lot tomeet one or more of the following criteria shall constitutecause for rejection of the lot. The conformance criteria for eachof the pres
