ASTM B2-00

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Designation: B 2 – 00
Standard Specification for
Medium-Hard-Drawn Copper Wire
This standard is issued under the fixed designation B 2; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber 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. Scope 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),
1.1 This specification covers medium-hard-drawn round
3.1.4 Package size (see 10.1),
copper wire for electrical purposes (see Explanatory Note 1).
3.1.5 Special package marking, if required, and
1.2 The SI values of density and resistivity are to be
3.1.6 Place of inspection (Section 10).
regarded as standard. For all other properties the inch-pound
values are to be regarded as standard, and the SI units may be
4. Materials and Manufacture
approximate.
4.1 The material shall be copper of such quality and purity
2. Referenced Documents that the finished product shall have the properties and charac-
teristics prescribed in this specification.
2.1 The following documents of the issue in effect on date
of material purchase form a part of this specification to the
NOTE 1—Specifications B 5, B 49, and B 170 define the materials
extent referenced herein: suitable for use.
2.2 ASTM Standards:
4.2 Copper bars of special qualities, forms, or types, as may
B5 Specification for Electrolytic Tough-Pitch Copper Re-
be agreed upon between the manufacturer and the purchaser,
finery Shapes
and which will conform to the requirements prescribed in this
B49 Specification for Copper Redraw Rod for Electrical
specification, may also be used.
Purposes
B 170 Specification for Oxygen-Free Electrolytic Copper— 5. Dimensions and Permissible Variations
Refinery Shapes
5.1 The wire sizes shall be expressed as the diameter of the
B 193 Test Method for Resistivity of Electrical Conductor
wire in decimal fractions of an inch to the nearest 0.0001 in.
Materials
(0.1 mil) or in millimetres to the nearest 0.001 mm (Explana-
B 258 Specification for Standard Nominal Diameters and
tory Note 2).
Cross-SectionalAreasofAWGSizesofSolidRoundWires
5.2 Within the range of diameters included in Table 1 the
Used as Electrical Conductors
wire shall not vary from the specified diameter by more than 6
2.3 Other Document:
1 %, expressed to the nearest 0.0001 in. (0.1 mil) 0.001 mm.
NBS Handbook 100—Copper Wire Tables of the National
5.3 Ten percent, but not less than five coils or spools (or all
Bureau of Standards
if the lot is less than five) from any lot of wire shall be gaged
at three places. If accessible, one gaging shall be taken near
3. Ordering Information
each end and one near the middle. If any of the selected coils
3.1 Orders for material under this specification should
orspoolsfailstoconformtotherequirementsprescribedin5.2,
include the following information:
all coils or spools shall be gaged in the manner specified.
3.1.1 Quantity of each size,
6. Workmanship, Finish, andAppearance
6.1 The wire shall be free from all imperfections not
This specification is under the jurisdiction of ASTM Committee B-1 on
consistent with the best commercial practice.
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper and Copper Alloys.
7. Tensile Properties
Current edition approved April 10, 2000. Published June 2000. Originally
published as B 2 – 12. Last previous editionB2–94.
7.1 The wire shall conform to the requirements as to tensile
Annual Book of ASTM Standards, Vol 02.01.
properties prescribed in Table 1 (Explanatory Note 2 and Note
Annual Book of ASTM Standards, Vol 02.03.
Available from the National Technical Information Service, 5285 Port Royal 3).
Rd., Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 2–00
TABLE 1 Tensile Requirements
Diameter Area at 20°C Tensile Strength Elongation, min,
%in 10-in.
2 2
in. mm cmil in. mm psi MPa
(250 mm)
Min Max Min Max
0.4600 11.684 211 600 0.1662 107.0 42 000 49 000 290 340 3.8
0.4096 10.404 167 800 0.1318 85.0 43 000 50 000 295 345 3.6
0.3648 9.266 133 100 0.1045 67.4 44 000 51 000 305 350 3.2
0.3249 8.252 105 600 0.08291 53.5 45 000 52 000 310 360 3.0
0.2893 7.348 83 690 0.06573 42.4 46 000 53 000 315 365 2.8
0.2576 6.543 66 360 0.05212 33.6 47 000 54 000 325 370 2.5
0.2294 5.827 52 620 0.04133 26.7 48 000 55 000 330 380 2.2
0.2043 5.189 41 740 0.03278 21.2 48 330 55 330 335 380 1.9
0.1819 4.620 33 090 0.02599 16.8 48 660 55 660 335 385 1.7
0.1620 4.115 26 240 0.02061 13.3 49 000 56 000 340 385 1.5
0.1443 3.665 20 820 0.01635 10.5 49 330 56 330 340 390 1.4
0.1285 3.264 16 510 0.01297 8.37 49 660 56 660 340 390 1.3
0.1144 2.906 13 090 0.01028 6.63 50 000 57 000 345 395 1.3
0.1019 2.588 10 380 0.008155 5.26 50 330 57 330 345 395 1.2
0.0907 2.304 8 230 0.00646 4.17 50 660 57 600 350 400 1.2
0.0808 2.052 6 530 0.00513 3.31 51 000 58 000 350 400 1.1
0.0720 1.829 5 180 0.00407 2.63 51 330 58 330 355 400 1.1
0.0641 1.628 4 110 0.00323 2.08 51 660 58 660 355 405 1.0
0.0571 1.450 3 260 0.00256 1.65 52 000 59 000 360 405 1.0
0.0508 1.290 2 580 0.00203 1.31 52 330 59 330 360 410 1.0
0.0453 1.151 2 050 0.00161 1.04 52 660 59 660 365 410 1.0
0.0403 1.024 1 620 0.00128 0.823 53 000 60 000 365 415 1.0
7.2 Tests on a specimen containing a joint shall show at 9. Joints
least 95 % of the minimum tensile strength given in Table 1.
9.1 No joints shall be made in the completed wire (Explana-
Elongation tests shall not be made on a specimen containing a
tory Note 7). Joints in wire and rods, prior to final drawing,
joint.
shall be made in accordance with the best commercial practice
7.3 For wire the nominal diameter of which is more than
and shall conform to the requirements prescribed in 7.2.
0.001 in. (1 mil) (0.025 mm) greater than a size listed in Table
1, but which is less than that of the next larger size, the
10. Inspection
requirements of the next larger size shall apply.
10.1 Unless otherwise specified in the contract or purchase
7.4 Determine the elongation of the wire as the permanent
order, the manufacturer shall be responsible for the perfor-
increase in length due to the breaking of the wire in tension,
mance of all inspection and test requirements specified (Ex-
measured between gage marks placed originally 10 in. (254
planatory Note 8).
mm) apart upon the test specimen (Explanatory Note 4).
7.5 If any part of the fracture takes place outside the gage 10.2 All inspections and tests shall be made at the place of
marks or in the jaws of the testing machine, or if an examina- manufacture unless otherwise especially agreed to between the
tion of the specimen indicates a flaw, the value obtained may manufacturer and the purchaser at the time of the purchase.
not be representative of the material. In such cases the test may
10.3 The manufacturer shall afford the inspector represent-
be discarded and a new test made.
ing the purchaser all reasonable manufacturer’s facilities to
7.6 Retests—If, upon testing a sample from any coil or
satisfy that the material is being furnished in accordance with
spool of wire, the results do not conform to the requirements
this specification.
prescribed in Table 1, two additional samples shall be tested
10.4 Unless otherwise agreed upon between the purchaser
and the average of the three tests shall determine the accep-
and the manufacturer, conformance of the wire to the various
tance or rejection of the coil or spool.
requirements listed in this specification shall be determined on
samples taken from each lot of wire presented for acceptance.
8. Resistivity
10.5 The manufacturer shall, if requested prior to inspec-
8.1 Electrical resistivity shall be determined on representa-
tion, certify that all wire in the lot was made under such
tive samples by resistance measurements (Explanatory Note 5
conditions that the product as a whole conforms to the
and Note 6). At a temperature of 20°C the resistivity shall not
requirements of this specification as determined by regularly
exceed the following values:
mad
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