Sep 17 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Forging Annealing Hot Working Cold WorkingApplications
Introduction
Aluminium bronzes are alloys of copper with a composition of 5 to 12% of aluminum. Aluminium bronzes contain nickel, silicon, manganese, and iron as well. They are present in wrought and cast form. The presence of hard, adherent, protective alumina film in the alloys contributes to their strength which is greater than that of brasses or tin bronzes. They are anti-corrosive in nature and are found in golden color that does not tarnish much with time.
Chemical Composition
The chemical composition of UNS C62400 copper alloy is shown in the table below.
| Element |
Content (%) |
| Cu |
86.0 |
| Fe |
3.0 |
| Al |
11.0 |
Physical Properties
The following table shows the physical properties of UNS C62400 copper alloy.
| Properties |
Metric |
Imperial |
| Density |
7.45 (g/cm3) |
0.269 (lb/in3) |
| Melting point |
982°C |
1800°F |
Mechanical Properties
The mechanical properties of C62400 copper alloy is given below.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B |
92 |
92 |
| Tensile strength, ultimate |
655 MPa |
95000 psi |
| Tensile strength, yield |
330 MPa |
47900 psi |
| Elongation at break |
14.00% |
14.00% |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Other Designation
Equivalent designations to aluminium nickel bronze UNS C62400 include:
- UNS C62400
- ASME SFA5.7
- ASTM B150
- SAE J461
- SAE J463
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C62400 copper alloy is about 50% whereas that of Alloy 360 FC Brass is 100%.
Welding
The following are the welding recommendations for UNS C62400:
- Soldering - not recommended
- Brazing - fair
- Oxyacetylene - not recommended
- Gas shielded arc welding – good
- Coated metal arc welding – good
- Spot welding – good
- Seam welding – good
- Butt welding
Forging
The hot forgeability rating of UNS C62400 is 80%. The recommended hot working temperature for this alloy is 760 and 885ºC (1400 and 1625ºF).
Annealing
UNS C62400 copper alloy is annealed at 593 to 648ºC (1100 to 1200°F).
Hot working
UNS C62400 copper alloys have excellent hot working property.
Cold Working
UNS C62400 copper alloys have poor cold working property.
Applications
Aluminium bronzes are mainly used in sea water applications that include:
- Pumps and valve components
- Marine equipment
- High strength fasteners
- Pole line hardware