Copper (UNS C70100)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties


Copper-nickel (Cu-Ni) alloys have a single-phase structure throughout the entire range of alloys. Apart from the main elements copper and nickel, elements such as manganese, iron, and silicon are added in small amounts.

These alloys are known to possess good corrosion resistance, good strength, and ductility. The following datasheet discusses the chemical composition and properties of copper UNS C70100.

Chemical Composition

The chemical composition of copper UNS C70100 is given in the following table.

Element Content (%)
Nickel, Ni 3-4
Manganese, Mn 0.050 max
Copper, Cu Balance

Physical Properties

The following table discusses the physical properties of copper UNS C70100.

Properties Metric Imperial
Density 8.9 g/cm3 0.323 lb/in3

Mechanical Properties

The mechanical properties of annealed copper UNS C12900 (O61-Temper) are tabulated below.

Properties Metric Imperial
Tensile strength 240 MPa 35 ksi
Yield strength 75 MPa 11 ksi
Elongation 55% 55%
Hardness, Rockwell 40 40


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Machinability - The machinability of copper UNS C70100 alloy is rated at 30.

Welding - Soft soldering and brazing are considered as excellent welding techniques for copper UNS C70100, while coated metal arc welding and resistance welding are rated as good. Oxyacetylene welding can be used if required.

Hot working - Copper UNS C70100 alloy has excellent hot working abilities. The hot working temperature ranges between 760 and 925ºC (1400 and 1700ºF).

Cold working - Copper UNS C70100 alloy has excellent cold working properties.

Annealing - Copper UNS C70100 alloy can be annealed at temperatures ranging from 480 and 700ºC (900 and 1300ºF).


Copper UNS C70100 finds application in:

  • Electronic beam welding of rotor bars and end rings
  • Components for use in seawater environment

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