Copper Alloy UNS C77000 Flat, Shaped and Round Wire

Applications of Nickel Silver 55-18 Wire

  • Resistance Wire
  • Hardware
  • Optical components
  • Photographic applications
  • Screws, Rivets
  • Base metal for plated jewelry


UNS C77000 has good electrical and thermal conductivity. This copper alloy wire can be fabricated by blanking, forming and bending, and shearing. Nickel silvers are copper alloys that contain copper, nickel, and zinc (no sliver). The nickel silvers have moderately high strength and good corrosion resistance. They have low to moderate strength and good aqueous corrosion resistance.

Chemistry Typical


C75200 63.0-66.5 16.5-19.5 0.05 max 0.25 max Balance 0.50 Mn max C76200 57.0-61.0 11.0-13.5 0.09 max 0.25 max Balance 0.50 Mn max C77000 53.5-56.5 16.5-19.5 0.05 max 0.25 max Balance 0.50 Mn max

* Contact Ulbrich Wire for request regarding the availability of other copper alloys.
* Contact Ulbrich Technical Department for limits for additional trace elements and impurity levels.
* Nickel values in includes cobalt.
* Copper values include silver.
* Copper plus sum of named elements 99.5% min.

Physical Properties

Typical Density: 0.310 - 0.316 lbs/in3, 8.58 - 8.75 g/cm3

Electrical Conductivity: (% IACS at 68° F 20°C, annealed): 5.5 - 9%

Thermal Conductivity: BTU-in/hr-ft2-° F
At 68° F: 17 - 24

Mean Coefficient of Thermal Expansion: µin/in-°F
68 - 572 °F: 9 - 9.3

Modulus of Elasticity: KSI (MPa)
18 x 103 in tension

Melting Range: 1981 °F (1083 °C)


Profile, Round, Flat, Square

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 53 KSI min (365 MPa min)
Yield Strength: 25 KSI min (172 MPa min)
Elongation: 35% min

Properties: Tempered

These alloys can be cold worked to various tempers.

*Actual physical and mechanical properties are alloy dependent. Contact Ulbrich Technical Service for alloy specific properties.

Additional Properties

Corrosion Resistance

Contact Ulbrich Wire for specific information.

Wire Finishes

XC - Extra clean. Annealed or annealed and cold rolled. Contact Ulbrich Wire with special finish requests.

Heat Treatment

These alloys are non hardenable by heat treatment.


Soldering, brazing, gas shielded arc welding, seam welding, butt welding, spot welding, and oxyacetylene welding techniques are used for welding UNS C77000 copper alloy wire. The coated metal arc welding method is not suitable for welding this alloy.

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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