Nov 12 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication 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 C74500 nickel silver 65-10 copper alloy has high corrosion and tarnish-resistance, and good formability. It is stronger than UNS C75200 alloy.
The following datasheet gives an overview of UNS C74500 copper alloy.
Chemical Composition
The following table shows the chemical composition of UNS C74500 copper alloy.
Element |
Content (%) |
Cu |
65 |
Zn |
25 |
Ni |
10 |
Physical Properties
The physical properties of UNS C74500 copper alloy are tabulated below.
Properties |
Metric |
Imperial |
Density |
8.69 g/cm3 |
0.314 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C74500 copper alloy are outlined in the following table.
Properties |
Metric |
Imperial |
Tensile strength |
338-896 MPa |
49000-130000 psi |
Yield strength (depending on temper) |
124-524 MPa |
18000-76000 psi |
Elongation at break (in 25.4 mm) |
50% |
50% |
Elastic modulus |
117 GPa |
17000 ksi |
Poisson's ratio |
0.34 |
0.34 |
Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
Shear modulus |
46 GPa |
6670 ksi |
Thermal Properties
The thermal properties of UNS C74500 copper alloy are given in the following table.
Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@ 20-300°C/68-572°F) |
16.4 µm/m°C |
9.11 µin/in°F |
Thermal conductivity (@ 20°C/68°F) |
45 W/mK |
312 BTU in/hr.ft.°F |
Other Designations
Other designations that are equivalent to UNS C74500 copper alloy include:
- ASTM B122
- ASTM B151
- ASTM B206
- QQ W321
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C74500 copper alloy is 20.
Welding
UNS C74500 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 C74500 copper alloy has poor hot forming capacity.
Cold Working
UNS C74500 copper alloy has good cold working capacity.
Annealing
The UNS C74500 copper alloy can be annealed at temperatures ranging from 594 to 760°C (1100 to 1400°F).
Applications
UNS C74500 copper alloy is 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