Copper Alloy (UNS C21000)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Copper is relatively easy to mine and refine. It can be obtained from the ores cuprite, chalcocite, malachite, tenorite, covellite, and bornite. Today, the largest consumer of copper is in the building industry.

UNS C21000 is a copper-zinc alloy. It is a type of brass metal with good formability and corrosion resistance.

The following datasheet discusses the chemical composition and properties of copper UNS C21000.

Chemical Composition

The chemical composition of UNS C21000 copper alloy is outlined in the following table.

Elements Content (%)
Copper, Cu 94-96
Iron, Fe 0.05
Lead, Pb 0.05
Zinc, Zn Balance

Physical Properties

The following table discusses the physical properties of copper UNS C21000.

Properties Metric Imperial
Density 8.86 g/cm3 0.320 lb/in3
Melting point 1049°C 1920°F

Mechanical Properties

The mechanical properties of UNS C21000 copper flat products (H01-temper) are tabulated below.

Properties Metric Imperial
Tensile strength 290MPa 42 ksi
Yield strength 221 MPa 32 ksi
Elongation 25% 25%
Shear strength 221 MPa 32 ksi

Thermal Properties

The thermal properties of C21000 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 18 µm/m°C 10 µin/in°F
Thermal conductivity (@20°C/68°F) 234 W/mK 1620 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to UNS C21000 copper alloy are:

  • ASTM B134
  • ASTM B36
  • ASTM B587
  • ASTM B698
  • QQ W321
  • SAE J461
  • SAE J463


Machinability - The machinability of copper UNS C21000 alloy is rated at 20.

Welding - Welding methods such as soldering and brazing are ideal for this alloy. However butt welding, oxyacetylene welding and gas shielded arc welding can also be used. Methods like coated metal arc welding, spot welding and seam welding are not recommended.

Forging - The forging temperature for copper UNS C21000 alloy ranges between 760 and 871°C (1400 and 1600° F).

Hot working - Copper UNS C21000 alloy has good hot working abilities, which includes coining, drawing, blanking, piercing and punching, shearing, spinning, squeezing, and swaging, and stamping.

Cold working - Copper UNS C21000 alloy has excellent cold working properties.

Annealing - copper UNS C21000 alloy is annealed at temperatures ranging between 427 and 788°C (800 and 1450 °F).


Copper UNS C21000 finds application in:

  • Ammunition components
  • Coinage
  • Rectifiers
  • Lead-in wires
  • Tokens
  • Fuse caps
  • Primers
  • Base for gold plate
  • Medallions, emblems, and plaques.

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