1、Designation: B 452 02Standard Specification forCopper-Clad Steel Wire for Electronic Application1This standard is issued under the fixed designation B 452; 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 (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 bare round copper-clad st
3、eelwire for electronic application.1.2 Four classes of copper-clad steel wire are covered asfollows:1.2.1 Class 30HSNominal 30 % conductivity hard-drawn,1.2.2 Class 30ANominal 30 % conductivity annealed,1.2.3 Class 40HSNominal 40 % conductivity hard-drawn, and1.2.4 Class 40ANominal 40 % conductivity
4、 annealed.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are in SI units.2. Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced h
5、erein:2.2 ASTM Standards:B 193 Test Method for Resistivity of Electrical ConductorMaterials2B 258 Specification for Standard Nominal Diameters andCross-Sectional Areas of AWG Sizes of Solid Round WiresUsed as Electrical Conductors22.3 National Institute of Standards and Technology:NBS Handbook 100Co
6、pper Wire Tables33. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size and class,3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),3.1.3 Class of wire (see 1.2 and Table 1),3.1.4 Packaging and shipping (Sect
7、ion 10),3.1.5 If inspection is required (see 6.3.3), and3.1.6 Place of inspection (see 6.1).4. Material4.1 The wire shall consist of a core of homogeneousopen-hearth, electric-furnace, or basic-oxygen steel with acontinuous outer cladding of copper thoroughly bonded to thecore throughout and shall b
8、e of such quality as to meet therequirements of this specification (Note 1).NOTE 1The copper-clad steel wire provides a high-strength conductorfor use in wire and cable where greater strength is required and a lowerconductivity can be tolerated. At high frequencies the reduced conductiv-ity is less
9、pronounced due to concentration of the current in the outerperiphery of the wire. Minimum thickness of 6 % and 10 % of the radiusfor 30 and 40 % conductivity material, respectively, has been establishedto facilitate the inspection of thickness on fine wires.5. General Requirements5.1 Tensile Strengt
10、h and ElongationThe copper-clad steelwire shall conform to the tensile strength and elongationrequirements of Table 1. For intermediate sizes not listed inTable 1, the elongation requirements of the next smaller sizeshall apply; in the case of tensile strength, the requirements ofthe next larger siz
11、e shall apply.5.2 ResistivityThe electrical resistivity at a temperature of20C shall not exceed the values prescribed in Table 2. SeeNote 2 for calculating electrical resistance.NOTE 2Relationships which may be useful in connection with thevalues of electrical resistivity prescribed in this specific
12、ation are shown inTable 3. Resistivity units are based on the International Annealed CopperStandard (IACS) adopted by IEC in 1913, which is158 Vmm2/m at 20Cfor 100 % conductivity. The value of 0.017241 Vmm2/m and the value of0.15328 Vg/m2at 20C are respectively the international equivalent ofvolume
13、and weight resistivity of annealed copper equal to 100 %conductivity. The latter term means that a copper wire 1 in. in length andweighing 1 g would have a resistance of 0.15328 V. This is equivalent toa resistivity value of 875.20V lb/mile2, which signifies the resistance ofa copper wire 1 mile in
14、length weighing 1 lb. It is also equivalent, forexample, to 1.7241 V/cm of length of a copper bar 1 cm2in cross section.A complete discussion of this subject is contained in NBS Handbook 100.The use of five significant figures in expressing resistivity does not implythe need for greater accuracy of
15、measurement than that specified in TestMethod B 193. The use of five significant figures is required for completereversible conversion from one set of resistivity units to another.5.3 Dimensions and Permissible VariationsThe wire sizes1This specification is under the jurisdiction of ASTM Committee B
16、01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.06 onComposite Conductors.Current edition approved April 10, 2002. Published April 2002. Originallypublished as B 452 67. Last previous edition B 452 93(1998)e1.2Annual Book of ASTM Standards, Vol 02.03.3Available from t
17、he National Institute of Standards and Technology (NIST),Gaithersburg, MD 20899.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall be expressed as the diameter of the wire in decimalfractions of an inch to the nearest 0.0001 in. (
18、0.003 mm) (Note3). For diameters under 0.0100 in. (0.254 mm), the wire shallnot vary from the specified diameter by more than 60.0001 in.(0.003 mm) and for diameters of 0.0100 in. (0.254 mm) andover, the wire shall not vary from the specified diameter bymore than 61 %, expressed to the nearest 0.000
19、1 in. (0.003mm).NOTE 3The values of the wire diameters in Table 1 are given to thenearest 0.0001 in. (0.003 mm) and correspond to the standard sizes givenin Specification B 258. The use of gage numbers to specify wire sizes isnot recognized in this specification because of the possibility of confusi
20、on.An excellent discussion of wire gages and related subjects is contained inNBS Handbook 100.5.4 Adhesion and Other DefectsThe copper-clad steelwire, when tested in accordance with 7.4, shall not reveal anyseams, pits, slivers, or other imperfection of sufficient magni-tude to indicate inherent def
21、ects or imperfections. Examinationof the wire at the break with the unaided eye (normal spectaclesexcepted) shall show no separation of copper from the steel.5.5 JointsNecessary joints in the wire and rods prior tofinal drawing shall be made in accordance with good commer-cial practice. The finished
22、 wire shall contain no joints or splicesmade at finished size.5.6 FinishThe wire shall be free from copper discontinui-ties and all imperfections not consistent with good commercialpractice (see 7.5).5.7 Copper ThicknessThe minimum copper thickness dueto eccentricity shall be not less than the follo
23、wing:5.7.1 The 30 % conductivity wire shall have a minimumthickness of not less than 6 % of the wire radius.5.7.2 The 40 % conductivity wire shall have a minimumthickness of not less than 10 % of the wire radius (see 7.6 andNote 3).6. Inspection6.1 GeneralAll tests and inspections shall be made at t
24、heplace of manufacture unless otherwise agreed upon betweenthe manufacturer and the purchaser at the time of the purchase.The manufacturer shall afford the inspector representing thepurchaser all reasonable facilities to satisfy him that theTABLE 1 Tensile and Elongation RequirementsDiameter Cross-S
25、ectional Area at 20C Tensile Strength, psi (kgf/mm2)Elongation, min.%in10in.(250 mm)in. mm cmil in.2mm2Class 30HS, min Class 30A, min Class 40HS, min Class 40A, minClass30HS and40HSClass30A and40A0.0720 1.83 5180 0.00407 2.63 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.5 150.0641 1.6
26、3 4110 0.00323 2.08 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.5 150.0571 1.45 3260 0.00256 1.65 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.5 150.0508 1.29 2580 0.00203 1.31 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.5 150.0453 1.15 2050 0.00161 1.0
27、4 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.5 150.0403 1.02 1620 0.00128 0.823 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.0 150.0359 0.912 1290 0.00101 0.653 127 000 (89.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.0 150.0320 0.813 1020 0.000804 0.519 127 000 (8
28、9.3) 50 000 (35.2) 110 000 (77.3) 45 000 (31.6) 1.0 150.0285 0.724 812 0.000638 0.412 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 150.0253 0.643 640 0.000503 0.324 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 150.0226 0.574 511 0.000401 0.259 127 000 (89.3) 55 000
29、(38.7) 110 000 (77.3) 50 000 (35.2) 1.0 150.0201 0.511 404 0.00317 0.205 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0179 0.455 320 0.000252 0.162 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0159 0.404 253 0.000199 0.128 127 000 (89.3) 55 000 (38.7) 110 00
30、0 (77.3) 50 000 (35.2) 1.0 100.0142 0.361 202 0.000158 0.102 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0126 0.320 159 0.000125 0.0804 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0113 0.287 128 0.000100 0.0647 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 5
31、0 000 (35.2) 1.0 100.0100 0.254 100 0.0000785 0.0507 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0089 0.226 79.2 0.0000622 0.0401 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0080 0.203 64.0 0.0000503 0.0324 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 00
32、0 (35.2) 1.0 100.0071 0.180 50.4 0.0000396 0.0255 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0063 0.160 39.7 0.0000312 0.0201 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0056 0.142 31.4 0.0000246 0.0159 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (
33、35.2) 1.0 100.0050 0.127 25.0 0.0000196 0.0127 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0045 0.114 20.2 0.0000159 0.0103 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0040 0.102 16.0 0.0000126 0.00811 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35
34、.2) 1.0 100.0035 0.089 12.2 0.00000962 0.00621 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 100.0031 0.079 9.61 0.00000755 0.00487 127 000 (89.3) 55 000 (38.7) 110 000 (77.3) 50 000 (35.2) 1.0 10TABLE 2 Resistivity, max, at 20CClass of Wire Vmm2/m30HS and 30A40HS and 40A0.05862 (0.0
35、58616)0.04397 (0.043970)B 4522material is being furnished in accordance with this specifica-tion (Note 4).NOTE 4Cumulative results secured on the product of a single manu-facturer, indicating continued conformance to the criteria, are necessary toensure an overall product meeting the requirements of
36、 this specification.The sample sizes and conformance criteria given for the various charac-teristics are applicable only to lots produced under these conditions.6.1.1 Unless otherwise agreed by the manufacturer and thepurchaser, conformance of the wire to the various requirementslisted in Section 5
37、shall be determined on samples taken fromeach lot of wire presented for acceptance.6.1.2 The manufacturer shall, if requested prior to inspec-tion, certify that all wire in the lot was made under suchconditions that the product as a whole conforms to therequirements of this specification as determin
38、ed by regularlymade and recorded tests.6.2 Definitions:6.2.1 lotany amount of wire of one class and size pre-sented for acceptance at one time, such amount, however, notto exceed 10 000 lb (4500 kg) (Note 5).NOTE 5A lot should comprise material taken from a product regularlymeeting the requirements
39、of this specification. Inspection of individuallots of less than 500 lb (230 kg) of wire cannot be justified economically.For small lots of 500 lb (230 kg) or less, the purchaser may agree to themanufacturers regular inspection of the product as a whole as evidence ofacceptability of such small lots
40、.6.2.2 samplea quantity of production units (coils, reels,etc.) selected at random from the lot for the purpose ofdetermining conformance of the lot to the requirements of thisspecification.6.2.3 specimena length of wire removed for test purposesfrom any individual production unit of the sample.6.3
41、Sample SizeThe number of production units in asample (see Note 4) shall be as follows:6.3.1 For tensile strength, elongation, resistivity, and adhe-sion and other defects, the sample shall consist of fourproduction units. For surface finish the sampling shall be inaccordance with Table 4. From each
42、unit, one test specimen ofsufficient length shall be removed for the performance of therequired tests.6.3.2 For dimensional measurements, the sample shall con-sist of a quantity of production units shown in Table 5 underheading “First Sample.”6.3.3 For packaging inspection (when specified by thepurc
43、haser at the time of placing the order), the sample shallconsist of a quantity of production units as shown in Table 4.7. Test Methods7.1 Tensile Strength and ElongationThe tensile strength,expressed in pounds per square inch (or kilograms-force persquare millimetre), shall be obtained by dividing t
44、he maximumload carried by the specimen during the tension test, by theoriginal cross-sectional area of the specimen. Tensile strengthand elongation may be determined simultaneously on the samespecimen.7.1.1 For Classes 30A and 40A, the elongation of wire maybe determined as the permanent increase in
45、 length, expressedin percent of the original length, due to the breaking of the wirein tension, measured between gage marks placed originally 10in. (250 mm) apart upon the test specimen (Note 6). Theelongation of wire shall be determined as described above orby measurements made between the jaws of
46、the testingmachine. When the latter method is used, the zero length shallbe the distance between the jaws at the start of the tension testwhen 10 % of the minimum specified breaking load has beenapplied and be as near 10 in. (250 mm) as practicable, and thefinal length shall be the distance between
47、the jaws at the timeof rupture. The fracture shall be between gage marks in thecase of specimens so marked or between the jaws of the testingmachine and not closer than 1 in. (25 mm) to either gage markor either jaw.NOTE 6It is known that the rate of loading during tension testingaffects the perform
48、ance of the sample to a greater or lesser extentdepending upon many factors. In general, tested values of tensile strengthare increased and tested values of elongation are reduced with increase ofspeed of the moving head of the testing machine. In the case of tests onsoft or annealed wire, however,
49、the effects of speed of testing are notpronounced. Tests of soft wire made at speeds of moving head whichunder no-load conditions are not greater than 12 in./min (300 mm/min) donot alter the final results of tensile strength and elongation determinationsto any practical extent. In the case of hard-drawn wire, these effects arepronounced when the speed of the moving head is excessive. It issuggested that tests be made at speeds of moving head which, underno-load conditions, are not greater than 3 in./min (76 mm/min), but in nocase at a speed greater
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