Sep 13 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Fabrication and Heat Treatment
Welding
Machinability
Heat Treatment
Applications
Introduction
Copper alloys come in more than 400 variations. UNS C99500 alloy is a copper casting alloy.
It's composed of 87.9% Copper (Cu), 4.5% Nickel (Ni), 4% Iron (Fe), 1.2% Aluminum (Al), 1.2% Silicon (Si), and 1.2% Zinc (Zn). This alloy is often used in mining equipment gears, valve stems, electrical parts and propeller wheels.
The datasheet given below provides an overview of UNS C99500 alloy.
Chemical Composition
The chemical composition of UNS C99500 alloy is outlined in the following table.
| Element |
Content (%) |
| Cu |
87.9 |
| Ni |
3.50-5.50 |
| Fe |
3.0-5.0 |
| Si |
0.50-2.0 |
| Zn |
0.50-2.0 |
| Al |
0.50-2.0 |
| Mn |
≤ 0.50 |
| Pb |
≤ 0.25 |
Physical Properties
The following table shows the physical properties of UNS C99500 alloy.
| Properties |
Metric |
Imperial |
| Density |
8.30 g/cm3 |
0.300 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C99500 alloy are displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell (3000 kg) |
50 |
50 |
| Hardness, Brinell (500 kg) |
145 |
145 |
| Tensile strength |
≥ 483 MPa |
≥ 70100 psi |
| Yield strength |
≥ 275 MPa |
≥ 39900 psi |
| Elongation at break (in 50 mm) |
≥ 12.0% |
≥ 12.0% |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
50 |
50 |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Fabrication and Heat Treatment
Welding
Gas shielded arc welding is suitable for UNS C99500 alloy.
Machinability
The machinability rating of UNS C99500 alloy is 50.
Heat Treatment
UNS C99500 alloy has stress relieving temperature of 316°C (600°F). This alloys responds to heat treatment. The time at temperature for this alloy is one hour per inch of section thickness. The solution heat treating temperature is 885°C (1625°F). The time at temperature is one hour per inch of section thickness. The temperature for precipitation hardening is 482°C (900°F). The time at temperature is one hour.
Applications
UNS C99500 alloy is used in mining equipment gears, valve stems, electrical parts, propeller wheels, marine parts and components that need resistance to dealuminification and dezincifications.