Copper (UNS C12220)

Topics Covered

Chemical Composition


The conventional alloy designation system for wrought and cast copper and copper alloy products used in North America is the unified numbering system (UNS). UNS C12220 is a phosphorus de-oxidized copper alloy. It is a wrought alloy.

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UNS C12220 has good to excellent corrosion resistance to sea water, brackish water, atmosphere and non-oxidizing acid; however is vulnerable to galvanic corrosion when coupled with aluminum, lead, tin, magnesium, iron, and zinc. Care should be taken not to expose it to sulfides, ammonia, oxidizing acids, moist halogens, and solutions with ammonium ions.

The following datasheet discusses the chemical composition and properties of copper UNS C12220.

Chemical Composition

The chemical composition of copper UNS C12220 is given in the following table.

Element Content (%)
Copper, Cu + Silver, Ag 99.90min
Phosphorus, P 0.04 - 0.065


Copper UNS C12220 has excellent hot and cold workability. It also has good forging ability. It can be fabricated by several processes such as bending, knurling, drawing and upsetting, hot forging and pressing, coining, shearing, swaging, roll threading, spinning, and stamping.


Copper UNS C12220 finds application in:

  • Bus bars and bus conductors
  • Rectifiers
  • Waveguides
  • Vacuum seals
  • Klystrons
  • Hollow conductors
  • Transistor components
  • Glass-to-metal seals
  • Coaxial cables
  • Microwave tubes
  • Lead-in wires and anodes for vacuum tubes

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