Copper Alloy (UNS C64730)

Topics Covered

Chemical Composition


Copper is one of the most useful metals known to mankind. Its thermal conductivity, electrical conductivity and resistance to corrosion are very high; hence it has a wide scope for applications. By varying the impurities that it is alloyed with it can be used for a variety of applications.

UNS numbers C10100 to C13000 indicate pure copper. Copper alloy C64730 is an alloy of copper and silicon. Copper C64730 alloy is registered with the US EPA as an antimicrobial. This datasheet will elaborate on the chemical composition and properties of this C64730 alloy.

Chemical Composition

The chemical composition of silver copper UNS C12900 is given in the following table.

Element Content (%)
Copper, Cu 93.5
Nickel, Ni 2.9-3.5
Tin, Sn 1-1.5
Silicon, Si 0.5-0.9
Zinc, Zn 0.2-0.5
Manganese, Mn 0.1


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Some of the methods adopted for fabricating this alloy are coining, bending, coppersmith, upsetting and drawing. Other methods of fabrication are knurling, roll threading, spinning, swaging and stamping.

Forging - Copper UNS C64730 alloy has good forging ability.

Hot working - Copper UNS C64730 alloy has excellent hot working abilities.

Cold working - Copper UNS C64730 alloy has excellent cold working properties.


Silver copper UNS C64730 finds application in:

  • Electrical/electronic connectors
  • Bus bars
  • Mini transistor components
  • ICs
  • Waveguides, co-axial cables, microwave tubes
  • Lead in wires and anodes for vacuum tubes
  • Glass-to-metal seals.

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