1、Designation: B2 08 B2 12Standard Specification forMedium-Hard-Drawn Copper Wire1This standard is issued under the fixed designation B2; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parenthe
2、ses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers medium-hard-drawn round copper wire for electrical purposes (see Explanatory Note 1).1.2 The SI values of density and resistivi
3、tyvalues stated in inch-pound units are to be regarded as standard. For all otherproperties the inch-pound values are to be regarded as standard, and the SI units may be approximate. The values given inparentheses are mathematical conversions to SI units that are provided for information only and ar
4、e not considered standard.1.2.1 ExceptionThe SI values of density and resistivity are to be regarded as standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate sa
5、fety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B5 Specification
6、 for High Conductivity Tough-Pitch Copper Refinery ShapesB49 Specification for Copper Rod Drawing Stock for Electrical PurposesB170 Specification for Oxygen-Free Electrolytic CopperRefinery ShapesB193 Test Method for Resistivity of Electrical Conductor MaterialsB258 Specification for Nominal Diamete
7、rs and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as ElectricalConductors2.3 Other Documents:NBS Handbook 100 Copper Wire Tables of the National Bureau of Standards33. Ordering Information3.1 Orders for material under this specification should include the following information:3.1.
8、1 Quantity of each size;3.1.2 Wire size: diameter in inches (see 5.1 and Table 1);3.1.3 Type of copper, if special (see Section 4);3.1.4 Package size (see 11.1);3.1.5 Special package marking, if required; and3.1.6 Place of inspection (Section 10).4. Materials and Manufacture4.1 The material shall be
9、 copper of such quality and purity that the finished product shall have the properties and characteristicsprescribed in this specification.NOTE 1Specifications B5, B49, and B170 define the materials suitable for use.1 This specification is under the jurisdiction of ASTM Committee B01 on Electrical C
10、onductors and is the direct responsibility of Subcommittee B01.04 on Conductorsof Copper and Copper Alloys.Current edition approved April 1, 2008Nov. 15, 2012. Published April 2008 November 2012. Originally approved in 1912. Last previous edition approved in 20052008as B2 00B2 08. (2005)1. DOI: 10.1
11、520/B0002-08.10.1520/B0002-122 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from National Tec
12、hnical Information Service (NTIS), 5285 Port Royal Rd., Springfield, VA 22161, http:/www.ntis.gov.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically
13、possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700
14、, West Conshohocken, PA 19428-2959. United States14.2 Copper bars of special qualities, forms, or types, as may be agreed upon between the manufacturer and the purchaser, andwhich will conform to the requirements prescribed in this specification, may also be used.5. Dimensions and Permissible Variat
15、ions5.1 The wire sizes shall be expressed as the diameter of the wire in decimal fractions of an inch to the nearest 0.0001 in. (0.1mil) or in millimetres to the nearest 0.001 mm (Explanatory Note 2).5.2 Within the range of diameters included in Table 1 the wire shall not vary from the specified dia
16、meter by more than 61 %,expressed to the nearest 0.0001 in. (0.1 mil) 0.001 mm.5.3 Ten percent, but not less than five coils or spools (or all if the lot is less than five) from any lot of wire shall be gaged atthree places. If accessible, one gaging shall be taken near each end and one near the mid
17、dle. If any of the selected coils or spoolsfails to conform to the requirements prescribed in 5.2, all coils or spools shall be gaged in the manner specified.6. Workmanship, Finish, and Appearance6.1 The wire shall be free from all imperfections not consistent with the best commercial practice.7. Te
18、nsile Properties7.1 The wire shall conform to the requirements as to tensile properties prescribed in Table 1 (Explanatory Note 3 and Note 4).7.2 Tests on a specimen containing a joint shall show at least 95 % of the minimum tensile strength given in Table 1. Elongationtests shall not be made on a s
19、pecimen containing a joint.7.3 For wire the nominal diameter of which is more than 0.001 in. (1 mil) (0.025 mm) greater than a size listed in Table 1, butwhich is less than that of the next larger size, the requirements of the next larger size shall apply.7.4 Determine the elongation of the wire as
20、the permanent increase in length due to the breaking of the wire in tension, measuredbetween gage marks placed originally 10 in. (254 mm) apart upon the test specimen (Explanatory Note 4).7.5 If any part of the fracture takes place outside the gage marks or in the jaws of the testing machine, or if
21、an examination ofthe specimen indicates a flaw, the value obtained may not be representative of the material. In such cases the test may be discardedand a new test made.7.6 RetestsIf, upon testing a sample from any coil or spool of wire, the results do not conform to the requirements prescribedin Ta
22、ble 1, two additional samples shall be tested and the average of the three tests shall determine the acceptance or rejection ofthe coil or spool.8. Resistivity8.1 Electrical resistivity shall be determined on representative samples by resistance measurements (Explanatory Note 5 andNote 6). At a temp
23、erature of 20C the resistivity shall not exceed the following values:TABLE 1 Tensile RequirementsDiameter Area at 20C Tensile Strength Elongation, min,%in 10-in.(250 mm)in. mm cmil in.2 mm2 psi MPaMin Max Min Max0.4600 11.684 211 600 0.1662 107.0 42 000 49 000 290 340 3.80.4096 10.404 167 800 0.1318
24、 85.0 43 000 50 000 295 345 3.60.3648 9.266 133 100 0.1045 67.4 44 000 51 000 305 350 3.20.3249 8.252 105 600 0.08291 53.5 45 000 52 000 310 360 3.00.2893 7.348 83 690 0.06573 42.4 46 000 53 000 315 365 2.80.2576 6.543 66 360 0.05212 33.6 47 000 54 000 325 370 2.50.2294 5.827 52 620 0.04133 26.7 48
25、000 55 000 330 380 2.20.2043 5.189 41 740 0.03278 21.2 48 330 55 330 335 380 1.90.1819 4.620 33 090 0.02599 16.8 48 660 55 660 335 385 1.70.1620 4.115 26 240 0.02061 13.3 49 000 56 000 340 385 1.50.1443 3.665 20 820 0.01635 10.5 49 330 56 330 340 390 1.40.1285 3.264 16 510 0.01297 8.37 49 660 56 660
26、 340 390 1.30.1144 2.906 13 090 0.01028 6.63 50 000 57 000 345 395 1.30.1019 2.588 10 380 0.00816 5.26 50 330 57 330 345 395 1.20.0907 2.304 8 230 0.00646 4.17 50 660 57 600 350 400 1.20.0808 2.052 6 530 0.00513 3.31 51 000 58 000 350 400 1.10.0720 1.829 5 180 0.00407 2.63 51 330 58 330 355 400 1.10
27、.0641 1.628 4 110 0.00323 2.08 51 660 58 660 355 405 1.00.0571 1.450 3 260 0.00256 1.65 52 000 59 000 360 405 1.00.0508 1.290 2 580 0.00203 1.31 52 330 59 330 360 410 1.00.0453 1.151 2 050 0.00161 1.04 52 660 59 660 365 410 1.00.0403 1.024 1 620 0.00128 0.823 53 000 60 000 365 415 1.0B2 122Nominal D
28、iameter, in. Resistivity at 20C,lb/mile 2 g/m20.460 to 0.325 (11.684 to 8.255 mm), incl 896.15 0.156950.460 to 0.325 (11.684 to 8.255 mm), incl 896.15 0.15694Under 0.325 to 0.0403 (8.255 to 1.024 mm), incl 905.44 0.15858Under 0.325 to 0.0403 (8.255 to 1.024 mm), incl 905.44 0.158578.2 Tests to deter
29、mine conformance to the electrical resistance requirements shall be made in accordance with Test MethodB193.9. Joints9.1 No joints shall be made in the completed wire (Explanatory Note 7). Joints in wire and rods, prior to final drawing, shallbe made in accordance with the best commercial practice a
30、nd shall conform to the requirements prescribed in 7.2.10. Inspection10.1 Unless otherwise specified in the contract or purchase order, the manufacturer shall be responsible for the performance ofall inspection and test requirements specified (Explanatory Note 8).10.2 All inspections and tests shall
31、 be made at the place of manufacture unless otherwise especially agreed to between themanufacturer and the purchaser at the time of the purchase.10.3 The manufacturer shall afford the inspector representing the purchaser all reasonable manufacturers facilities to satisfythat the material is being fu
32、rnished in accordance with this specification.10.4 Unless otherwise agreed upon between the purchaser and the manufacturer, conformance of the wire to the variousrequirements listed in this specification shall be determined on samples taken from each lot of wire presented for acceptance.10.5 The man
33、ufacturer shall, if requested prior to inspection, certify that all wire in the lot was made under such conditions thatthe product as a whole conforms to the requirements of this specification as determined by regularly made and recorded tests.10.6 Inspection and Testing Terms:10.6.1 LotA lot is any
34、 amount of wire of one type and size presented for acceptance at one time; such amount, however, notto exceed 100 000 lb or 45 000 kg (Explanatory Note 9).10.6.2 SampleA sample is a quantity of production units (coils, reels, and so forth) selected at random from the lot for thepurpose of determinin
35、g conformance of the lot to the requirements of this specification.10.6.3 SpecimenA specimen is a length of wire removed for test purposes from any individual production unit of the sample.10.7 Sample SizeThe number of production units in a sample (Explanatory Note 8) shall be as follows:10.7.1 For
36、tension, elongation, and resistivity determinations, the sample shall consist of four production units. From each unit,one test specimen of sufficient length shall be removed for the performance of the required tests.10.7.2 For dimensional measurements, the sample shall consist of a quantity of prod
37、uction units shown in Table 2 under theheading “First Sample.”10.7.3 For surface-finish inspection and for packaging inspection (when specified by the purchaser at the time of placing theorder) the sample shall consist of a quantity of production units shown in Table 3.11. Packaging and Shipping11.1
38、 Package sizes shall be agreed upon between the manufacturer and the purchaser in the placing of individual orders.11.2 The wire shall be protected against damage in ordinary handling and shipping.12. Keywords12.1 copper wire; medium-hard copper wire; round copper electrical wire; round copper wireT
39、ABLE 2 Sampling for Dimensional MeasurementsNumber of Unitsin LotFirst Sample Second SampleNumber of Units inSample, n1Allowable Number ofDefects in FirstSample, c1Number of Units inSample, n2 n1 plus n2 Allowable Number of Defects in Both Samples, c21 to 14, incl all 0 . . .15 to 50, incl 14 0 . .
40、.51 to 100, incl 19 0 23 42 1101 to 200, incl 24 0 46 70 2201 to 400, incl 29 0 76 105 3401 to 800, incl 33 0 112 145 4Over 800 34 0 116 150 4B2 123EXPLANATORY NOTESNOTE 1Medium-hard drawn wire approaches hard-drawn wire in its characteristics, but from the very nature of the product, exact uniformi
41、ty in tensilestrength cannot be obtained. Hence it has been necessary to establish a range of tensile strengths within which standard medium-hard-drawn wire maybe expected to be found.NOTE 2The values of the wire diameters in Table 1 are given to the nearest 0.0001 in. (0.001 mm) and correspond to t
42、he standard sizes given inSpecification B258. The use of gage numbers to specify wire sizes is not recognized in this specification because of the possibility of confusion. Anexcellent discussion of wire gages and related subjects is contained in NBS Handbook 100.NOTE 3Other tests than those provide
43、d in this specification have been considered at various times, such as twist tests, wrap tests, tests for elastic limit,etc. It is the opinion of the committee that twist and wrap tests on medium-hard-drawn wire do not serve a useful purpose and should be regarded asundesirable, as well as inconclus
44、ive as to results and significance. Tests for values of elastic limit are likewise indefinite as to results. Tests to determineelastic properties of medium-hard-drawn wire from which wire stringing and sagging data may be compiled are considered to be outside the scope ofthe acceptance tests contemp
45、lated in this specification.NOTE 4It is known that the rate of loading during tension testing of copper affects the performance of the sample to a greater or lesser extent, dependingupon many factors. In general, tested values of tensile strength are increased and tested values of elongation are red
46、uced with increase of speed of themoving head of the testing machine. These effects are pronounced when the speed of the moving head is excessive in the testing of medium-hard-drawnwires. It is suggested that tests be made at speeds of moving head that, under no-load conditions, are not greater than
47、 3 in. (75 mm)/min, but in no caseat a speed greater than that at which correct readings can be made.NOTE 5“Resistivity” is used in place of “percentage conductivity.” The value of 0.15328 g/m2 at 20C is the international standard for the resistivityof annealed copper equal to 100 % conductivity. Th
48、is term means that a wire 1 m in length and weighing 1 g would have a resistance of 0.15328 . Thisis equivalent to a resistivity value of 875.20 lb/mile2, which signifies the resistance of a wire 1 mile in length weighing 1 lb. It is also equivalent, forexample, to 1.7241 /cm of length of a bar 1 cm
49、2 in cross section. A complete discussion of this subject is contained in NBS Handbook 100.Relationships that may be useful in connection with the values of resistivity prescribed in this specification are as in Table 4 each column containingequivalent expressions, at 20C.NOTE 6The value of density of copper is in accordance with the International Annealed Copper Standard. The corresponding value at 0C is 8.90g/cm3 (0.32150 lb/in.3). As pointed out in the discussion of this subject in NBS Handbook 100, there is no appreciable difference in va
