Coppers are copper alloys, containing not less than 99.3% of copper. Wrought coppers are designated with the numbers from C10100 through C157600.
High copper alloys are copper alloys, containing more than 96% but less than 99.3% of copper. Wrought High Copper Alloys are designated with the numbers from C16200 through C19600.
Alloys from these groups have any major alloying elements but may contain small amounts of beryllium (Be), chromium (Cr), phosphorous (P), silver (Ag), arsenic (As), sulfur (S), lead (Pb), tin (Sn), zirconium (Zr), magnesium (Mg), iron (Fe), cadmium (Cd) and tellurium (Te) as minor alloying additives.
High copper alloys have better hardness and tensile strength, but lower ductility than coppers.
The alloys may be strengthened by cold work (strain hardening). Ductility of the alloys decreases as a result of cold work.
Some of the high copper alloys are heat-treatable (beryllium copper, chromium copper).
Coppers and high copper alloys have good corrosion resistance provided by protection film of copper oxide formed on the metal surface.
Coppers and high copper alloys are used for manufacturing electric wires and other electric components.
|UNS Designation||Trade mark||Be,%||Al,%||Co,%||Si,%||Cr,%||Fe,%||Zr,%||Cu, % min|
|C10100||Oxygen-Free Electronic Copper||-||-||-||-||-||-||-||99.99|
|C17000||Beryllium Copper||1.6-1.85||0.20 max.||0.20 min.||0.20 max.||-||-||-||98.30|
|C18200||Chromium Copper||-||-||-||0.10 max.||0.6-1.2||0.10 max.||-||99.1|