Sep 20 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesFabrication and Heat Treatment Machinability Welding Hot Working Cold Working AnnealingApplications
Introduction
Pure copper has good electrical and thermal conductivity. More than 400 varieties of copper alloys are available. UNS C75400 nickel silver 65-15 copper alloy has high corrosion and tarnish-resistance, and good formability.
The following datasheet gives an overview of UNS C75400 copper alloy.
Chemical Composition
The following table shows the chemical composition of UNS C75400 copper alloy.
| Element |
Content (%) |
| Cu |
65 |
| Zn |
20 |
| Ni |
15 |
Physical Properties
The physical properties of UNS C75400 copper alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Density |
8.70 g/cm3 |
0.314 lb/in³ |
| Melting point |
1040°C |
1900°F |
Mechanical Properties
The mechanical properties of UNS C75400 copper alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
365-634 MPa |
52900-92000 psi |
| Yield strength (depending on temper) |
124-545 MPa |
18000-79000 psi |
| Elongation at break (in 50.8 mm) |
43% |
43% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson's ratio |
0.34 |
0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
| Shear modulus |
47 GPa |
6820 ksi |
Thermal Properties
The thermal properties of UNS C75400 copper alloy are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@ 20-300°C/68-572°F) |
16.2 µm/m°C |
9 µin/in°F |
| Thermal conductivity (@ 20°C/68°F) |
36 W/mK |
250 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C75400 copper alloy is 20.
Welding
UNS C75400 copper alloy can be welded using brazing, soldering, gas shielded arc welding, oxyacetylene welding, spot welding, butt welding, and seam welding methods. Coated metal arc welding method is not preferred for this alloy.
Hot Working
UNS C75400 copper alloy has poor hot forming capacity.
Cold Working
UNS C75400 copper alloy has good cold working capacity.
Annealing
Annealing of UNS C75400 copper alloy can be performed at temperatures ranging from 594 to 816°C (1100 to 1500°F).
Applications
UNS C75400 copper alloy are used in the following applications:
- Musical instrument valves and components
- Jewelry
- Slide fasteners
- Optical instrument components
- Fittings for food and dairy equipment
- Screws
- Rivets
- Decorative items