1、Designation: B 33 04Standard Specification forTinned Soft or Annealed Copper Wire for ElectricalPurposes1This standard is issued under the fixed designation B 33; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last rev
2、ision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (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 tinned, round, sof
3、t, or annealedcopper wire for electrical purposes.1.2 The SI values for density and resistivity are to beregarded as standard. For all other properties the inch-poundvalues are to be regarded as the standard and the SI units maybe approximate.1.3 This standard does not purport to address all of thes
4、afety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 49 Specification for Copper
5、 Redraw Rod for ElectricalPurposesB 193 Test Method for Resistivity of Electrical ConductorMaterialsB 258 Specification for Standard Nominal Diameters andCross-Sectional Areas of AWG Sizes of Solid Round WiresUsed as Electrical Conductors2.2 Other Document:3NBS Handbook 100 Copper Wire Tables3. Orde
6、ring 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 Type of copper, if special (see 4.2),3.1.4 Package size (see 10.1),3.1.5 Special packaging marking, if re
7、quired, and3.1.6 Place of inspection (see 7.1).4. Material4.1 Tin for CoatingThe tin used for coating shall becommercially pure (Explanatory Note 1). For purposes of thisspecification, the tin shall be considered commercially pure ifthe total of other elements, exclusive of copper, does notexceed 1%
8、. Notwithstanding the previous sentence, chemicalanalysis of the tin coating or of the tin used for coating shall notbe required under this specification. Adequacy of the tincoating is assured by the continuity of coating and adherence ofcoating requirements (see 5.4 and 5.5, respectively).4.2 Coppe
9、r-Base MetalThe base metal shall be copper ofsuch quality and purity that the finished product shall haveproperties and characteristics prescribed in this specification.NOTE 1Specification B 49 defines copper suitable for use.4.3 Copper bars of special qualities, forms, or types, as maybe agreed upo
10、n between the manufacturer and the purchaser,and which will conform to the requirements prescribed in thisspecification, may also be used.5. General Requirements (See Section 8)5.1 Tensile Strength and Elongation (Explanatory Note 2and Note 3)The tinned wire shall conform to the require-ments for el
11、ongation prescribed in Table 1. No requirementsfor tensile strength are specified. For wire whose nominaldiameter is more than 0.001 in. (1 mil) (0.025 mm) greater thana size listed in Table 1, but less than that of the next larger size,the requirements of the next larger size shall apply.5.2 Resist
12、ivity (Explanatory Note 1 and Note 4)Theelectrical resistivity of tinned wire at a temperature of 20Cshall not exceed the values prescribed in Table 2.5.3 Dimensions and Permissible Variations (ExplanatoryNote 2)The wire sizes shall be expressed as the diameter ofthe wire in decimal fractions of an
13、inch to the nearest 0.0001 in.(0.1 mil) or in millimetres to the nearest 0.0025 mm. The1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved
14、 Sept. 1, 2004. Published October 2004. Originallyapproved in 1919. Last previous edition approved in 2000 as B 33 00.2For 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 t
15、o the standards Document Summary page onthe ASTM website.3Available from National Technical Information Service (NTIS), U.S. Depart-ment of Commerce, 5285 Port Royal Rd., Springfield, VA 22161.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
16、 States.tinned wire shall not vary from the specified diameter by morethan the amounts prescribed in Table 3.5.4 Continuity of CoatingThe tin coating shall be con-tinuous. The continuity of coating on the wire shall bedetermined on representative samples taken before stranding orinsulating. The cont
17、inuity of tinning shall be determined by thehydrochloric acid-sodium polysulfide test in accordance with6.4.5.5 Adherence of CoatingThe tin coating shall be firmlyadherent to the surface of the copper. The adherence of coatingon the wire shall be determined on representative samplestaken before stra
18、nding or insulating. The adherence of coatingshall be determined by the wrapping and immersion test inaccordance with 6.5.5.6 JointsNecessary joints in the completed wire and inthe wire and rods prior to final drawing shall be made inaccordance with the best commercial practice.5.7 FinishThe coating
19、 shall consist of a smooth continu-ous layer, firmly adherent to the surface of the copper. The wireshall be free of all imperfections not consistent with the bestcommercial practice.6. Test Methods6.1 Tensile Strength and Elongation (Explanatory Note5)No test for tensile strength shall be required.
20、 The elonga-tion of wire whose nominal diameter is larger than 0.0808 in.(2.052 mm) in diameter shall be determined as the permanentincrease in length, expressed in percent of the original length,due to the breaking of the wire in tension, measured betweengage marks placed originally 10 in. (254 mm)
21、 apart upon thetest specimen. The elongation of wire whose nominal diameteris 0.0808 in. and under may be determined as described aboveor by measurements made between the jaws of the testingmachine. When the latter method is used, the zero length shallbe the distance between the jaws at the start of
22、 the tension testand be as near 10 in. as practicable and the final length shall bethe distance between the jaws at the time of rupture. Thefracture shall be between gage marks in the case of specimensso marked or between the jaws of the testing machine and notcloser than 1 in. (25.4 mm) to either g
23、age mark or either jaw.6.2 Resistivity (Expanatory Note 4)The electrical resistiv-ity of the material shall be determined in accordance with TestMethod B 193. The purchaser may accept certification that thewire was drawn from rod stock meeting the internationalstandard for annealed copper instead of
24、 resistivity tests on thefinished wire.6.3 Dimensional MeasurementsDimensional measure-ments shall be made with a micrometre caliper equipped witha vernier graduated in 0.0001 in. (0.0025 mm). Measurementsshall be made on at least three places on each unit selected forthis test. If accessible, one m
25、easurement shall be taken on eachend and one near the middle. The average of the threemeasurements shall determine compliance with the require-ments.TABLE 1 Tensile RequirementsDiameter Area at 20Cin. mm cmil in.2mm2Elongationin 10 in.(250 mm),% min0.4600 11.6840 211600.00 0.166190 107.2193 300.4096
26、 10.4038 167772.16 0.131768 85.0114 300.3648 9.2659 133079.04 0.104520 67.4321 300.3249 8.2525 105560.01 0.082907 53.4880 300.2893 7.3482 83694.49 0.065733 42.4086 250.2576 6.5430 66357.76 0.052117 33.6240 250.2294 5.8268 52624.36 0.041331 26.6652 250.2043 5.1892 41738.49 0.032781 21.1492 250.1819 4
27、.6203 33087.61 0.025987 16.7657 250.1620 4.1148 26244.00 0.020612 13.2980 250.1443 3.6652 20822.49 0.016354 10.5509 250.1285 3.2639 16512.25 0.012969 8.3669 250.1144 2.9058 13087.36 0.01027879 6.6315 250.1019 2.5883 10383.61 0.00815527 5.2615 200.0907 2.3038 8226.49 0.00646107 4.1684 200.0808 2.0523
28、 6528.64 0.00512758 3.3081 200.0720 1.8288 5184.00 0.00407150 2.6268 200.0641 1.6281 4108.81 0.00322705 2.0820 200.0571 1.4503 3260.41 0.00256072 1.6521 200.0508 1.2903 2580.64 0.00202683 1.3076 200.0453 1.1506 2052.09 0.00161171 1.0398 200.0403 1.0236 1624.09 0.00127556 0.8229 200.0359 0.9119 1288.
29、81 0.00101223 0.6530 200.0320 0.8128 1024.00 0.00080425 0.5189 200.0285 0.7239 812.25 0.00063794 0.4116 200.0253 0.6426 640.09 0.00050273 0.3243 200.0226 0.5740 510.76 0.00040115 0.2588 200.0201 0.5105 404.01 0.00031731 0.2047 150.0179 0.4547 320.41 0.00025165 0.1624 150.0159 0.4039 252.81 0.0001985
30、6 0.1281 150.0142 0.3607 201.64 0.00015837 0.1022 150.0126 0.3200 158.76 0.00012469 0.0804 150.0113 0.2870 127.69 0.00010029 0.0647 150.0100 0.2540 100.00 0.00007854 0.0507 100.0089 0.2261 79.21 0.00006221 0.0401 100.0080 0.2032 64.00 0.00005027 0.0324 100.0071 0.1803 50.41 0.00003959 0.0255 100.006
31、3 0.1600 39.69 0.00003117 0.0201 100.0056 0.1422 31.36 0.00002463 0.0159 100.0050 0.1270 25.00 0.00001963 0.0127 100.0045 0.1143 20.25 0.00001590 0.0103 100.0040 0.1016 16.00 0.00001257 0.0081 100.0035 0.0889 12.25 0.00000962 0.0062 100.0031 0.0787 9.61 0.00000755 0.0049 10TABLE 2 Electrical Resisti
32、vity RequirementsNominal Diameter Resistivity at 20Cin. mm Vlb/mile2Vg/m20.460 to 0.290, incl 11.7 to 7.4, incl 896.15 0.15695Under 0.290 to 0.103, incl Under 7.4 to 2.6, incl 900.77 0.15776Under 0.103 to 0.0201, incl Under 2.6 to 0.51, incl 910.15 0.15940Under 0.0201 to 0.0111 incl Under 0.51 to 0.
33、28, incl 929.52 0.16279Under 0.0111 to 0.0030, incl Under 0.28 to 0.076, incl 939.51 0.16454TABLE 3 Permissible Variations in DiamterNominal Diameter of WirePermissible Variations in Diameterin. mmin. mm plus minus plus minusUnder 0.0100 Under 0.25 0.0003 0.00010 0.0076 0.00250.0100 and over 0.25 an
34、d over 3 % 1 % 3 % 1 %B330426.4 Continuity of Coating:6.4.1 Specimens:6.4.1.1 Length of SpecimensTest specimens shall have alength of about 6 in. (152 mm). They shall be tagged or markedto correspond with the coil, spool, or reel from which they werecut.6.4.1.2 Treatment of SpecimensThe specimens sh
35、all bethoroughly cleaned by immersion in a suitable organic solventsuch as benzene, ether, or trichloroethylene for at least 3 min;then removed and wiped dry with a clean, soft cloth (Caution-see Explanatory Note 6). The specimens thus cleaned shall bekept wrapped in a clean, dry cloth until tested.
36、 That part of thespecimen to be immersed in the test solution shall not behandled. Care shall be taken to avoid abrasion by the cut ends.6.4.2 Special Solutions Required:6.4.2.1 Hydrochloric Acid Solution (HCl) (sp gr 1.088)Commercial HCl (sp gr 1.12) shall be diluted with distilledwater to a specif
37、ic gravity of 1.088 measured at 15.6C (60F).A portion of HCl solution having a volume of 180 mL shall beconsidered to be exhausted when the number of test specimensprescribed in Table 4 of a size as indicated in 6.4.3 have beenimmersed in it for two cycles.6.4.2.2 Sodium Polysulfide Solution (sp gr
38、1.142) (Ex-planatory Note 7)A concentrated solution shall be made bydissolving sodium sulfide cp crystals in distilled water until thesolution is saturated at about 21C (70F), and adding sufficientflowers of sulfur (in excess of 250 g/L of solution) to providecomplete saturation, as shown by the pre
39、sence in the solutionof an excess of sulfur after the solution has been allowed tostand for at least 24 h. The test solution shall be made bydiluting a portion of the concentrated solution with distilledwater to a specific gravity of 1.142 at 15.6C (60F). Thesodium polysulfide test solution should h
40、ave sufficient strengthto blacken thoroughly a piece of clean untinned copper wire in5 s. A portion of the test solution used for testing samples shallnot be considered to be exhausted until it fails to blacken apiece of clean copper as described above.6.4.3 Procedure:6.4.3.1 Immersion of SpecimensI
41、mmerse a length of atleast 412 in. (114 mm) from each of the clean specimens, inaccordance with the following cycles, in test solutions main-tained at a temperature between 15.6 and 21C (60 and 70F):(1) Immerse the specimen for 1 min in the HCl solutiondescribed in 6.4.2, wash, and wipe dry; (2) imm
42、erse thespecimen for 30 s in the sodium polysulfide solution describedin 6.4.2, wash, and wipe dry; (3) immerse the specimen for 1min in the HCl solution, wash, and dry; (4) immerse thespecimen for 30 s in the sodium polysulfide solution, wash, andwipe dry.6.4.3.2 Washing SpecimensAfter each immersi
43、on, imme-diately wash the specimens thoroughly in clean water and wipedry with a clean, soft cloth.6.4.3.3 Examination of SpecimensAfter immersion andwashing, examine the specimens to ascertain if copper exposedthrough openings in the tin coating has been blackened byaction of the sodium polysulfide
44、. The specimens shall beconsidered to have failed if, by such blackening, exposedcopper is revealed. No attention shall be paid to blackeningwithin 0.5 in. (12.7 mm) of the cut end. A grayish brownappearance of the coating shall not constitute failure.6.5 Adherence of Coating:6.5.1 Specimens:6.5.1.1
45、 Length of SpecimensTest specimens shall be ap-proximately 12 in. (305 mm) in length and shall be tagged ormarked to correspond with the coil, spool, or reel from whichthey are cut.6.5.1.2 Treatment of SpecimensThe specimens shall bethoroughly cleaned, if required, by immersion in a suitableorganic
46、solvent such as benzene, ether, or trichloroethylene forat least 3 min, then removed and dried (Caution-see Explana-tory Note 6). The specimens thus cleaned shall be keptwrapped in a clean dry cloth until tested. That part of thespecimens to be immersed in the test solution shall not behandled. Care
47、 shall be taken to avoid abrasion of the surface tobe subjected to test. Wire of sizes 0.005 in. (0.13 mm) andsmaller may be cleaned after wrapping around the mandrel.6.5.2 Procedure:6.5.2.1 WrappingSlowly wrap the test specimen in asuitable manner in an open helix around a polished mandrelhaving ro
48、unded ends and a diameter not to exceed four timesthe nominal diameter of the specimen. Take care not to stretchthe specimen during the wrapping operation. The spacing ofthe consecutive turns shall be approximately equal to thediameter of the wire. For sizes 0.021 in. (0.53 mm) and smaller,not more
49、than six helical turns shall be used for the test, and forwire larger than 0.021 in., not more than three turns shall beused.6.5.2.2 Immersion TestRemove the helically wrappedportion of the test specimen from the mandrel and immersecompletely in the sodium polysulfide solution (see 6.4.2) for 30s at the temperature prescribed in 6.4.3. On removal from thesodium polysulfide solution, immediately rinse the specimen inclean water and remove the excess by shaking.6.5.2.3 Examination of SpecimensExamine visually theouter peripheral surface of the heli
