Aug 21 2012
Topics Covered
IntroductionChemical
CompositionPhysical PropertiesMechanical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding
Heat Treatment
Introduction
Manganese bronze – copper casting alloy UNS C86300 is an alloy that primarily consists of
copper, zinc and aluminium.. The manganese present in UNS
C86300 gives a chocolate brown color to the alloy. Copper casting alloy UNS C86300 is used in
architecture for its longevity.
The following datasheet provides chemical composition and properties
of UNS C86300.
Chemical Composition
The chemical composition of copper alloy UNS C86300 is given in the
following table.
| Element |
Content
(%) |
| Copper, Cu |
60.0-68.0 |
| Zinc, Zn |
25.0 |
| Aluminium, Al |
3.0-7.50 |
| Manganese, Mn |
2.5-5.0 |
| Iron, Fe |
2.0-4.0 |
| Lead, Pb |
≤0.2 |
| Tin, Sn |
≤0.2 |
Physical Properties
The following table details the physical properties of UNS C86300.
| Properties |
Metric |
Imperial |
| Density |
7.70 g/cc |
0.278 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C86300 copper alloy are shown in the
following table.
| Properties |
Metric |
Imperial |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
| Hardness, Brinell |
225 |
225 |
| Tensile strength |
820 MPa |
119000 psi |
| Yield strength |
460 MPa |
66700 psi |
| Elongation at break |
18.00% |
18.00% |
| Machinability |
8 |
8 |
Other Designations
Equivalent designations to UNS C86300 include:
- AMS 4860
- ASTM B22
- ASTM B271
- ASTM B30
- ASTM B505
- ASTM B584
- ASTM B763
- MIL C-11866
- QQ C390
- QQ C523
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Machinability
Copper alloy UNS C86300 has a machinability rating of 8.
Welding
The preferred welding technique for UNS C86300 is coated metal arc
welding. Soldering, brazing, carbon arc welding, oxyacetylene welding and gas
shielded arc welding are not recommended for this alloy.
Heat Treatment
Copper casting alloy UNS C86300 does not respond to heat treatment.