ASTM-B910 Standard Specification for Annealed Copper-Clad Steel Wire

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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.




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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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


annealed copper clad steel wire; clad steel electrical conductor; copper electrical conductor–copper-clad steel; copper-clad steel electrical conductor; electrical conductor; steel wire–copper-clad;; ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)

To find similar documents by ASTM Volume:

02.03 (Electrical Conductors)

To find similar documents by classification:

77.140.65 (Steel wire, wire ropes and link chains Lifting link chains and wire ropes, see 53.020.30 Steel wire for springs, see 77.140.25)

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Document Number


Revision Level

2007 R18 EDITION



Modification Type


Publication Date

Oct. 1, 2018

Document Type


Page Count

4 pages

Committee Number