Aug 21 2012
Topics Covered
IntroductionChemical
CompositionPhysical PropertiesMechanical PropertiesThermal propertiesOther DesignationsFabrication and Heat
Treatment Machinability Welding
Introduction
Manganese bronze – copper casting alloy UNS C86100 is an alloy of copper, zinc, aluminium and manganese. Manganese present in UNS
C86100 offers an attractive chocolate brown color which is widely used in
architecture. The presence of lead improves the longevity of the
alloy.
The following datasheet provides chemical composition and properties of
copper alloy UNS C86100.
Chemical Composition
The chemical composition of UNS C86100 is given in the following
table.
| Element |
Content
(%) |
| Copper, Cu |
66.0-68.0 |
| Zinc, Zn |
21.0 |
| Aluminium, Al |
4.5-5.5 |
| Manganese, Mn |
2.5-5.0 |
| Iron, Fe |
2.0-4.0 |
| Nickel, Ni |
≤1.0 |
| Tin, Sn |
≤0.2 |
| Lead, Pb |
≤0.2 |
Physical Properties
The following table details the physical properties of copper alloy UNS
C86100.
| Properties |
Metric |
Imperial |
| Density |
7.90 g/cc |
0.285 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C86100 are shown in the following
table.
| Properties |
Metric |
Imperial |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
| Hardness, Brinell |
180 |
180 |
| Tensile strength |
655 MPa |
95000 psi |
| Yield strength |
330 MPa |
47900 psi |
| Elongation at break |
20.00% |
20.00% |
| Machinability |
30 |
30 |
| Compressive strength |
345 MPa |
50000 psi |
| Izod impact |
16.0 J |
11.8 ft-lb |
Thermal properties
The following table discusses the thermal properties of copper alloy UNS
C86100.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient
(@20-260°C/68-500°F) |
22.0 µm/m°C |
12.2 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
35.0 W/mK |
243 BTUin/hr.ft².°F |
Other Designations
Equivalent designations to UNS C86100 include:
Fabrication and Heat Treatment
Machinability
Copper alloy UNS C86100 has a machinability rating of 30.
Welding
The preferred welding techniques for UNS C86100 are oxyacetylene
welding, gas shielded arc welding and coated metal arc welding. Carbon arc
welding, soldering and brazing are not recommended for this alloy.