New Specification for Annealed Copper-Clad Steel Wire Has Worldwide
A proposed ASTM specification for annealed copper-clad steel wire
will set requirements for bare round copper-clad steel used globally
in numerous products in electrical, electronic, grounding, telecommunications,
and other applications.
This specification can be used all over the world, said Metallurgical Engineer
William Malone, technical manager, bimettalics, Copperweld Corp.,
Fayetteville, Tenn. The existing standard written about 30 years
ago only has 30 to 40 percent conductivity with high carbon steel
cores listed and doesnt cover all of the latest products available.
There are other conductivities made today with 21 to 70 percent
conductivity and lower carbon steel cores. Four conductivities
are covered in the draft specification: 21, 30, 40, and 70 percent.
Malone, who chairs Subcommittee B01.06 on Composite Conductors
in Committee B-1 on Electrical Conductors, will coordinate preparation
of the draft with input from users who represent electric utility
transmission engineers, manufacturers of communication, transmission
and specialty cables, and secondary producers who manufacture
smaller diameter wire for the wire and cable industry.
Primarily, were adding two more categories of conductivity and
making the standard specific to annealed wire, he said. The
existing specification, B 452, [ASTM Standard Specification for
Copper-Clad Steel Wire for Electronic Application] is for hard
and soft wire but only in high-carbon steel. The new specification
will cover high and low carbon steel; a wider range of product
offerings that have never had a specification for the users. In
small quantity, this wire is in many of the commercial jet airplanes;
in very small quantities, it is in most of the satellites. Its
also used for lead wires in electronic components.
Malone said the largest use of copper-clad steel is covered in
ASTM B 869, Standard Specification for Copper-Clad Steel Electrical
Conductor for CATV Drop Wire, regarding the center conductor wire
for coaxial television drop-cable that passes from the utility
pole into the home television. The pin protruding from the
cable is actually copper clad steel wire, he said. The subcommittees
new draft specification for annealed copper-clad steel wire will
cover all other applications in electronics, telecommunications,
and power in some instances.
The draft is projected for placement on first subcommittee ballot
this month. Subcommittee B01.06 also plans to develop a similar
standard for the same products in the hard drawn wire condition.
For further information, contact William Malone, Copperweld Corporation, 254 Cotton Mill Rd., Fayetteville, TN
37334-0070 (931/433-0418; fax: 931/433-0470). Committee B-1 meets
during ASTM Committee Week, April 12-13, in Toronto, Ontario,
Canada. For meeting or membership information, contact B-1 Staff
Manager Felicia Quinzi, ASTM (610/832-9738). //