COPPER ALLOY FAMILIES

The Unified Numbering System (UNS) is the accepted alloy designation system in North
America for wrought and cast copper and copper alloy products. Alloys are identified by
five-digit numbers preceded by the letter C. The system is based on an earlier and still
occasionally cited three-digit system developed by the U.S. copper and brass industry. For
example, Copper Alloy No. 377 (forging brass) became C37700 under the UNS. The UNS
is administered by the Copper Development Association (CDA). It is managed jointly by
the American Society for Testing and Materials (ASTM) and the Society of Automotive
Engineers (SAE), and alloy designations are common to standards issued by those organizations.
Numbers from C10000 through C79999 denote wrought alloys, i.e., rolled, drawn,
forged, or extruded. Cast alloys are numbered from C80000 through C99999. Descriptions
of the copper alloy families are presented in Table 1.








COPPER AND COPPER ALLOYS
Konrad J. A. Kundig
Metallurgical Consultant
Tucson, Arizona
John G. Cowie
Copper Development Association
New York, New York



Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.
Edited by Myer Kutz
Copyright  2006 by John Wiley & Sons, Inc.

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