UNS C71500 Wire

Cupronickel alloys are widely used for marine applications due to their excellent resistance to seawater corrosion, low biofouling rates, and good fabricability.

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Flat, Shaped and Round Wire


Cupronickels Alloys: Condensers; Evaporator and heat exchanger application; Ferrules; Applications where biofouling is a concern; Silver colored coinage.
Copper-Nickel-Tin Alloys: Relay springs; Switch springs; Lead frames; Telecommunication connectors


Cupronickel alloys are widely used for marine applications due to their excellent resistance to seawater corrosion, low biofouling rates, and good fabricability. They have provided reliable service for decades while offering effective solutions to today's technological challenges addition of nickel to copper improves strength and corrosion resistance while allowing the alloy to remain ductile.

Alloy C72500: Developed by Bell Laboratories to solve issues of stress corrosion found in field parts. The alloy blends the strength of Phosphor Bronze and the Corrosion resistance of Nickel Silver without too much loss of electrical conductivity. A combination of very good fatigue strength and resistance to corrosion and tarnish have also made this alloy an excellent choice for other applications found in corrosive environments or applications requiring improved solderability.

Chemistry Typical


C70600 Balance 9.0 - 10.0* 0.05 max 1.0 - 1.8 1.0 max 1.0 Mn max

C71500 Balance* 29.0 - 33.0 0.05 max 0.40 - 1.0 max 1.0 max 1.0 Mn max

C72500 Balance 8.5 - 10.5* 0.05 max 0.6 max 0.50 max | 1.8 - 2.8 Sn, 0.20 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.
* Copper plus sum of named elements 99.5% min.
* Nickel Values include Cobalt.
* Copper Values include Silver.

Physical Properties

Typical Density: 0.321 - 0.323 lbs/in3, 8.88 - 8.94 g/cm3

Electrical Conductivity: (% IACS at 68° F 20°C, annealed): 4.6 - 11 %

Mean Coefficient of Thermal Expansion: µin/in-° F:
68 - 572 ° F: 8.5 - 9.2

Thermal Conductivity: BTU-in/hr-ft2-° F at 68 ° F: 17 - 31

Modulus of Elasticity: KSI
18 - 22 x 103 in tension


Profile, Round, Flat, Square

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 43 KSI min (296 MPa min)

Yield Strength: 19 KSI min (131 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.


Contact Ulbrich Wire for specific information.

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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