Sep 27 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Fabrication and Heat Treatment
Welding
Machinability
Heat Treatment
Applications
Introduction
Copper alloys are available in more than 400 varieties. UNS C99300 alloy is a special alloy grade cast copper alloy.
It is composed of 71.8% Copper (Cu), 15% Nickel (Ni), 0.7% Iron (Fe), 11% Aluminium (Al), and 1.5% Cobalt (Co). It is often used in glass making molds and marine hardware.
The datasheet given below provides an overview of UNS C99300 alloy.
Chemical Composition
The chemical composition of UNS C99300 alloy is outlined in the following table.
| Element |
Content (%) |
| Copper, Cu |
71.8 |
| Nickel, Ni |
15 |
| Aluminium, Al |
11 |
| Copper, Co |
1.5 |
| Iron, Fe |
0.7 |
Physical Properties
The following table shows the physical properties of UNS C99300 alloy.
| Properties |
Metric |
Imperial |
| Density |
8.25 g/cm3 |
0.298 lb/in3 |
Mechanical Properties
The mechanical properties of the UNS C99300 alloy are displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell (500 kg) |
20 |
20 |
| Tensile strength (as cast) |
655 MPa |
95000 psi |
| Yield strength (as cast) |
379 MPa |
55000 psi |
| Elongation at break (as cast) |
2.00% |
2.00% |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Fabrication and Heat Treatment
Welding
Welding processes suitable for the UNS C99300 alloy include brazing, coated metal arc welding and gas shielded arc welding. Carbon arc welding, oxyacetylene welding and soldering are not recommended for this alloy.
Machinability
The machinability rating of the UNS C99300 alloy is 20.
Heat Treatment
The UNS C99300 alloy has stress relieving temperature of or 510°C (950°F). This alloy does not react to heat treatment. The time at temperature for this alloy is four hours per inch of section thickness.
Applications
The UNS C99300 alloy is used in marine hardware, glass making molds and plate glass rolls.