Flat, Shaped & Round Wire
Applications
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
Description
Cupronickels
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.
| UNS | Copper | Nickel | Lead | Iron | Zinc | Other |
|---|---|---|---|---|---|---|
| C70600 | Balance | 9.0 - 10.03 | 0.05 max | 1.0 - 1.8 | 1.0 max | 1.0 Mn max |
| C71500 | Balance 4,5 | 29.0 - 33.0 | 0.05 max | 0.40 - 1.0 max | 1.0 max | 1.0 Mn max |
| C72500 | Balance | 8.5 - 10.53 | 0.05 max | 0.6 max | 0.50 max | 1.8 - 2.8 Sn, 0.20 Mn max |
1 Contact Ulbrich Wire for request regarding the availability of other copper alloys
2 Contact Ulbrich Technical Department for limits for additional trace elements and impurity levels
3 Nickel values in includes cobalt
4 Copper values include silver
5 Copper plus sum of named elements 99.5% min
Physical Properties6
Typical Density: .321-.323 lb/in3, 8.88-8.94g/cm3
Electrical Conductivity: (% IACS at 68°F 20°C, annealed): 4.6-11%
Thermal Conductivity: BTU-in/hr-ft2-°F at 68°F: 17-31
Mean Coefficient of Thermal Expansion: µin/in-°F:
68-572 °F: 8.5-9.2
Modulus of Elasticity: KSI
18-22 x 103 in tension
Forms
Profile, Round, Flat, Square
Mechanical Properties at Room Temperature6
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.
6 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 not hardenable by heat treatment.
Welding
Contact Ulbrich Wire for specific information
Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and 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.