ASTM B910/B910M-00
(Specification)Standard Specification for Annealed Copper-Clad Steel Wire
Standard Specification for Annealed Copper-Clad Steel Wire
SCOPE
1.1 This specification covers bare round copper-clad steel for the following applications: electrical, electronic, grounding, telecommunications, and other applications.
1.2 Four conductivities are covered as follows: 21, 30, 40, and 70 %.
1.3 Temper is designated as annealed.
1.4 The values stated in inch-pound or SI units are to be regarded separately as the standard. Each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. For conductor sizes designated by AWG, the requirements in SI units have been numerically converted from corresponding values stated or derived in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units.
1.5 The following precautionary statement pertains to the test method portion only, Section 7, of this specification: This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 910/B 910M – 00
Standard Specification for
Annealed Copper-Clad Steel Wire
This standard is issued under the fixed designation B 910/B 910M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope the following information:
3.1.1 Quantity of each size;
1.1 This specification covers bare round copper-clad steel
3.1.2 Wire size: diameter in inches (see 5.2);
for the following applications: electrical, electronic, grounding,
3.1.3 Conductivity (see Table 1);
telecommunications, and other applications.
3.1.4 Wire to be used for redraw or not;
1.2 Four conductivities are covered as follows: 21, 30, 40,
3.1.5 Packaging and shipping (see 10);
and 70 %.
3.1.6 Place of inspection (see 6.1).
1.3 Temper is designated as annealed.
1.4 The values stated in inch-pound or SI units are to be
4. Material
regarded separately as the standard. Each system shall be used
4.1 The wire shall consist of a core of homogeneous
independently of the other. Combining values from the two
open-hearth, electric-furnace, or basic-oxygen steel with a
systems may result in nonconformance with the specification.
continuous outer cladding of copper thoroughly bonded to the
For conductor sizes designated by AWG, the requirements in SI
core throughout and shall be of such quality as to meet the
units have been numerically converted from corresponding
requirements of this specification.
values stated or derived in inch-pound units. For conductor
sizes designated by SI units only, the requirements are stated or
5. General Requirements
derived in SI units.
5.1 Tensile Strength and Elongation—The copper-clad steel
1.5 The following precautionary statement pertains to the
wire shall conform to the tensile strength requirements of Table
test method portion only, Section 7, of this specification: This
2. Because there are many carbon steel and copper thickness
standard does not purport to address all of the safety concerns,
combinations available, the desired tensile strength should be
if any associated with its use. It is the responsibility of the user
agreed upon between the purchaser and manufacturer prior to
of this standard to establish appropriate safety and health
placing an order. The elongation shall be 15.0 % minimum for
practices and determine the applicability of regulatory limita-
all diameters listed in 5.2.
tions prior to use.
5.2 Dimensions—The wire size range for this specification
2. Referenced Documents shall be from 0.0253 (0.643 mm) to 0.2294 in. (5.827 mm)
diameter (see Note 1).
2.1 The following documents of the issue in effect on the
5.2.1 Permissible Variations—The wire sizes shall meet the
date of material purchase form a part of this specification to the
following tolerances:
extent referenced herein:
5.2.1.1 For diameters 0.1000 in. ( 2.54 mm) and over, the
2.2 ASTM Standards:
wire shall not vary from the specified diameter by more than 6
B 193 Test Method for Resistivity of Electrical Conductor
2 1 ⁄2 %, expressed to the nearest 0.0001 in. (0.003 mm).
Materials
5.2.1.2 For diameters under 0.1000 in. (2.54 mm) and above
B 258 Specification for Standard Nominal Diameters and
0.0253 in. (0.643 mm), the wire shall not vary from the
Cross-Sectional Areas of AWG Sizes of Solid Round Wires
2 specified diameter by more than 6 1 %, expressed to the
Used as Electrical Conductors
nearest 0.0001 in. (0.003 mm).
2.3 NIST Document:
NBS Handbook 100 - Copper Wire Tables
NOTE 1—The values of the wire diameters in 5.2 are given to the
nearest 0.0001 in. (0.003 mm) and correspond to the standard sizes given
3. Ordering Information
in Specification B 258. The use of gage numbers to specify wire sizes is
not recognized in this specification because of the possibility of confusion.
3.1 Orders for material under this specification shall include
An excellent discussion of wire gages and related subjects is contained in
NBS Handbook 100.
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on 5.3 Adhesion and Surface Defects—The copper-clad steel
Composite Conductors.
wire, when tested in accordance with 7.4, shall not reveal any
Current edition approved Oct. 10, 2000. Published December 2000.
2 seams, pits, slivers, or other imperfection of sufficient magni-
Annual Book of ASTM Standards, Vol 02.03.
tude to indicate inherent defects or imperfections. Examination
Available from the National Institute of Standards and Technology (NIST),
Gaithersburg, MD 20899.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 910/B 910M
TABLE 1 Density (nom.) and Resistivity, (max.), at 20°C (Nominal NOTE 3—Cumulative results secured on the product of a single manu-
Conductivity, Minimum Conductivity, and Nominal Density for
facturer, indicating continued conformance to the criteria, are necessary to
Reference Only)
ensure an over-all product meeting the requirements of this specification.
The sample sizes and conformance criteria given for the various charac-
Maximum Resistivity
Nominal Density at 20°C teristics are applicable only to lots produced under these conditions.
Nominal Minimum
Conductivity (ohm Conductivity
6.1.1 Unless otherwise agreed by the manufacturer and the
3 3 2
(% IACS) lb/in (g/cm ) Ohm cmil/ft mm /m) (% IACS)
purchaser, conformance of the wire to the various requirements
21 0.2881 (7.98) 54.58 (0.097408) 19.00
listed in Section 5 shall be determined on samples taken from
30 0.2908 (8.06) 35.26 (0.058616) 29.41
each lot of wire presented for acceptance.
40 0.2941 (8.15) 26.45 (0.043970) 39.21
70 0.3101 (8.58) 15.96 (0.026524) 65.00 6.1.2 The manufacturer shall, if requested prior to inspec-
tion, certify that all wire in the lot was made under such
conditions that the product as a whole conforms to the
TABLE 2 Tensile and Minimum Copper Thickness (Conductivity
requirements of this specification as determined by regularly
and Nominal Copper Thickness for Reference Only)
made and recorded tests.
Minimum Tensile Minimum Copper Nominal Copper
6.2 Definitions:
Nominal
Strength Thickness Thickness
Conductivity
6.2.1 lot—any amount of wire of one class and size pre-
(% IACS) psi (N/mm ) (% of Diameter) (% of Diameter)
sented for acceptance at one time, such amount, however, not
21 55 000 (379) 1.5 3
to exceed 40 000 lb (18 144 kg) (Note 4).
30 50 000 (345) 3.0 7
40 45 000 (310) 5.0 9
NOTE 4—A lot should comprise material taken from a product regularly
70 35 000 (241) 15.0 20
meeting the requirements of this specification. Inspection of individual
lots 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 the
of the wire at the break with the unaided eye (normal spectacles
manufacturer’s regular inspection of the product as a whole as evidence of
excepted) shall show no separation of copper from the steel.
acceptability of such small lots.
5.4 Joints—Necessary joints in the wire and rods prior to
final drawing shall be made in accordance with good commer- 6.2.2 sample—a quantity of production units (coils, reels,
cial practice. The finished wire shall contain no joints or splices etc.) selected at random from the lot for the purpose of
made at finished size. determining conformance of the lot to the requirements of this
5.5 Finish—The wire shall be free from copper discontinui- specification.
ties and all imperfections not consistent with good commercial 6.2.3 specimen—a length of wire removed for test purposes
practice (see 7.5). from any individual production unit of the sample.
5.6 Copper Thickness—The minimum copper thickness due 6.3 Sample Size—The number of production units in a
to eccentricity shall not be less than shown in Table 2. sample (see Note 3) shall be as follows:
5.7 Resistivity—The electrical resistivity at a temperature of 6.3.1 For tensile strength, elongation, resistivity, adhesion,
20°C shall not exceed the values prescribed in Table 1. See
and other defects, the sample shall consist of four production
Note 2 for calculating electrical resistance. units. For surface finish the sampling shall be in accordance
with Table 3. From each unit, one test specimen of sufficient
NOTE 2—Relationships which may be useful in connection with the
length shall be removed for the performance of the required
values of electrical resistivity prescribed in this specification are shown in
tests. Samples found defective shall not be used.
Table 2. Resistivity units are based on the International Annealed Copper
Standard (IACS) adopted by IEC in 1913, which is 1/58 S·mm /m at 20°C
7. Test Methods
for 100 % conductivity. The value of 0.017241 S·mm /m and the value of
7.1 Tensile Strength and Elongation—Obtain the tensile
0.15328 S·g/m at 20°C are respectively the international equivalent of
volume and weight resistivity of annealed copper equal to 100 %
strength, expressed in pounds per square inch (or kilograms-
conductivity. The latter term means that a copper wire 1 in. in length and
force per square millimetre), by dividing the maximum load
weighing 1 g would have a resistance of 0.15328 S. This is equivalent to
carried by the specimen during the tension test, by the original
a resistivity value of 875.20S·lb/mile , which signifies the resistance of a
cross-sectional area of the specimen. Tensile strength and
copper wire 1 mile in length weighing 1 lb. It is also equivalent, for
2 elongation may be determined simultaneously on the same
example, to 1.7241 :S/cm of length of a copper bar 1 cm in cross section.
specimen.
A complete discussion of this subject is contained in NBS Handbook 100.
The use of five significant figures in expressing resistivity does not imply 7.1.1 The elongation of wire may be determined as the
the nee
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.