ASTM B910/B910M-07(2013)
(Specification)Standard Specification for Annealed Copper-Clad Steel Wire
Standard Specification for Annealed Copper-Clad Steel Wire
ABSTRACT
This specification covers annealed bare round copper-clad steel wire for the following applications: electrical, electronic, grounding, telecommunications, and other applications. Four types of copper-clad steel wires according to their electrical conductivities are included. The wire shall consist of a core of homogeneous open-hearth, electric-furnace, or basic-oxygen steel with a continuous outer cladding of copper thoroughly bonded to the core throughout. The copper-clad steel wire shall conform to the specified requirements for: tensile strength, elongation, dimension (diameter), adhesion and surface defects, joints, finish, copper thickness, density, and electrical resistivity. Methods for measurement, inspection, and testing such as torsion (twist) test are detailed.
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.
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Designation: B910/B910M −07 (Reapproved 2013)
Standard Specification for
Annealed Copper-Clad Steel Wire
This standard is issued under the fixed designation B910/B910M; 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.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope SectionalAreasofAWGSizesofSolidRoundWiresUsed
as Electrical Conductors
1.1 This specification covers bare round copper-clad steel
2.3 NIST Document:
forthefollowingapplications:electrical,electronic,grounding,
NBS Handbook 100Copper Wire Tables
telecommunications, and other applications.
1.2 Four conductivities are covered as follows: 21, 30, 40,
3. Ordering Information
and 70%.
3.1 Ordersformaterialunderthisspecificationshallinclude
1.3 Temper is designated as annealed.
the following information:
3.1.1 Quantity of each size;
1.4 The values stated in inch-pound or SI units are to be
3.1.2 Wire size: diameter in inches (see 5.2);
regarded separately as the standard. Each system shall be used
3.1.3 Conductivity (see Table 1);
independently of the other. Combining values from the two
3.1.4 Wire to be used for redraw or not;
systems may result in nonconformance with the specification.
3.1.5 Packaging and shipping (see 10); and
ForconductorsizesdesignatedbyAWG,therequirementsinSI
3.1.6 Place of inspection (see 6.1).
units have been numerically converted from corresponding
values stated or derived in inch-pound units. For conductor
4. Material
sizesdesignatedbySIunitsonly,therequirementsarestatedor
derived in SI units. 4.1 The wire shall consist of a core of homogeneous
open-hearth, electric-furnace, or basic-oxygen steel with a
1.5 The following precautionary statement pertains to the
continuous outer cladding of copper thoroughly bonded to the
test method portion only, Section 7, of this specification: This
core throughout and shall be of such quality as to meet the
standard does not purport to address all of the safety concerns,
requirements of this specification.
if any associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
5. General Requirements
practices and determine the applicability of regulatory limita-
5.1 Tensile Strength and Elongation—The copper-clad steel
tions prior to use.
wireshallconformtothetensilestrengthrequirementsofTable
2. Referenced Documents 2. Because there are many carbon steel and copper thickness
combinations available, the desired tensile strength should be
2.1 The following documents of the issue in effect on the
agreed upon between the purchaser and manufacturer prior to
dateofmaterialpurchaseformapartofthisspecificationtothe
placing an order. The elongation shall be 15.0% minimum for
extent referenced herein:
all diameters listed in 5.2.
2.2 ASTM Standards:
5.2 Dimensions—The wire size range for this specification
B193Test Method for Resistivity of Electrical Conductor
shall be from 0.0253 (0.643 mm) to 0.2294 in. (5.827 mm)
Materials
diameter (see Note 1).
B258 Specification for Nominal Diameters and Cross-
5.2.1 Permissible Variations—The wire sizes shall meet the
following tolerances:
5.2.1.1 For diameters 0.1000 in. (2.54 mm) and over, the
This specification is under the jurisdiction of ASTM Committee B01 on
wireshallnotvaryfromthespecifieddiameterbymorethan 6
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
Bi-Metallic Conductors.
1 ⁄2%, expressed to the nearest 0.0001 in. (0.003 mm).
Current edition approved April 1, 2013. Published April 2013. Originally
5.2.1.2 Fordiametersunder0.1000in.(2.54mm)andabove
approved in 2000. Last previous edition approved in 2007 as B910/B910M–07.
0.0253 in. (0.643 mm), the wire shall not vary from the
DOI: 10.1520/B0910_B0910M-07R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from National Institute of Standards and Technology (NIST), 100
the ASTM website. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B910/B910M − 07 (2013)
TABLE 1 Density (nom.) and Resistivity, (max.), at 20°C (Nominal in cross section. A complete discussion of this subject is contained in
Conductivity, Minimum Conductivity, and Nominal Density for
NBSHandbook100. The use of five significant figures in expressing
Reference Only) resistivity does not imply the need for greater accuracy of measurement
thanthatspecifiedinTestMethodB193.Theuseoffivesignificantfigures
Maximum Resistivity
is required for complete reversible conversion from one set of resistivity
Nominal Density at 20°C
Nominal Minimum
units to another.
Conductivity (ohm Conductivity
3 3 2
(% IACS) lb/in. (g/cm ) Ohm cmil/ft mm /m) (% IACS)
6. Inspection
21 0.2885 (7.99) 54.58 (0.0907) 19.00
30 0.2944 (8.15) 35.26 (0.0586) 29.41
6.1 General—All tests and inspections shall be made at the
40 0.2975 (8.24) 26.45 (0.0440) 39.21
place of manufacture unless otherwise agreed upon between
70 0.3098 (8.58) 15.96 (0.0265) 65.00
themanufacturerandthepurchaseratthetimeofthepurchase.
The manufacturer shall afford the inspector representing the
TABLE 2 Tensile and Minimum Copper Thickness (Conductivity
purchaser all reasonable facilities to satisfy him that the
and Nominal Copper Thickness for Reference Only)
material is being furnished in accordance with this specifica-
Minimum Tensile Minimum Copper Nominal Copper
tion (Note 3).
Nominal
Strength Thickness Thickness
Conductivity
NOTE 3—Cumulative results secured on the product of a single
(% IACS) psi (N/mm ) (% of Diameter) (% of Diameter)
manufacturer, indicating continued conformance to the criteria, are
21 50 000 (345) 1.5 3
necessary to ensure an over-all product meeting the requirements of this
30 45 000 (310) 3.0 7
specification. The sample sizes and conformance criteria given for the
40 40 000 (276) 5.0 9
various characteristics are applicable only to lots produced under these
70 35 000 (241) 15.0 20
conditions.
6.1.1 Unless otherwise agreed by the manufacturer and the
specified diameter by more than 61%, expressed to the purchaser,conformanceofthewiretothevariousrequirements
listed in Section 5 shall be determined on samples taken from
nearest 0.0001 in. (0.003 mm).
each lot of wire presented for acceptance.
NOTE1—Thevaluesofthewirediametersin5.2aregiventothenearest
6.1.2 The manufacturer shall, if requested prior to
0.0001 in. (0.003 mm) and correspond to the standard sizes given in
inspection, certify that all wire in the lot was made under such
Specification B258. The use of gage numbers to specify wire sizes is not
recognizedinthisspecificationbecauseofthepossibilityofconfusion.An conditions that the product as a whole conforms to the
excellent discussion of wire gages and related subjects is contained in
requirements of this specification as determined by regularly
NBS Handbook 100.
made and recorded tests.
5.3 Adhesion and Surface Defects—The copper-clad steel
6.2 Definitions:
wire, when tested in accordance with 7.4, shall not reveal any
6.2.1 lot—any amount of wire of one class and size pre-
seams, pits, slivers, or other imperfection of sufficient magni-
sentedforacceptanceatonetime,suchamount,however,isnot
tudetoindicateinherentdefectsorimperfections.Examination
to exceed 40 000 lb (18 144 kg) (Note 4).
ofthewireatthebreakwiththeunaidedeye(normalspectacles
NOTE4—Alotshouldcomprisematerialtakenfromaproductregularly
excepted) shall show no separation of copper from the steel.
meeting the requirements of this specification. Inspection of individual
5.4 Joints—Necessary joints in the wire and rods prior to
lots of less than 500 lb (230 kg) of wire cannot be justified economically.
final drawing shall be made in accordance with good commer- For small lots of 500 lb (230 kg) or less, the purchaser may agree to the
manufacturer’sregularinspectionoftheproductasawholeasevidenceof
cialpractice.Thefinishedwireshallcontainnojointsorsplices
acceptability of such small lots.
made at finished size.
6.2.2 sample—a quantity of production units (coils, reels,
5.5 Finish—The wire shall be free from copper discontinui-
andsoforth)selectedatrandomfromthelotforthepurposeof
ties and all imperfections not consistent with good commercial
determining conformance of the lot to the requirements of this
practice (see 7.5).
specification.
5.6 Copper Thickness—The minimum copper thickness due
6.2.3 specimen—a length of wire removed for test purposes
to eccentricity shall not be less than shown in Table 2.
from any individual production unit of the sample.
5.7 Resistivity—The electrical resistivity at a temperature of
6.3 Sample Size—The number of production units in a
20°C shall not exceed the values prescribed in Table 1. See
sample (see Note 3) shall be as follows:
Note 2 for calculating electrical resistance.
6.3.1 For tensile strength, elongation, resistivity, adhesion,
and other defects, the sample shall consist of four production
NOTE 2—Relationships which may be useful in connection with the
values of electrical resistivity prescribed in this specification are shown in units. For surface finish the sampling shall be in accordance
Table 2. Resistivity units are based on the InternationalAnnealed Copper
with Table 3. From each unit, one test specimen of sufficient
Standard (IACS) adopted by IEC in 1913, which is ⁄58 ohm mm /m at
length shall be removed for the performance of the required
20°C for 100% conductivity.The value of 0.017241 ohm mm /m and the
2 tests. Samples found defective shall not be used.
value of 0.15328 ohm g/m at 20°C are, respectively, the international
equivalent of volume and weight resistivity of annealed copper equal to
100% conductivity. The latter term means
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