C86200 Manganese Bronze
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Introduction
Manganese bronze – copper casting alloy UNS C86200 consists primarily of of copper, zinc, aluminium and manganese bronze. Manganese existing in UNS C86200 provides an attractive chocolate brown color which is commonly used in architecture. The presence of lead in the alloy improves the longevity of the alloy.
The following datasheet provides chemical composition and properties of UNS C86200 copper alloy.
Chemical Composition
The chemical composition of UNS C86200 is given in the following table.
| Element | Content (%) |
|---|---|
| Copper, Cu | 60.0-68.0 |
| Zinc, Zn | 26.0 |
| Aluminium, Al | 3.0-7.5 |
| Manganese, Mn | 2.5-5.0 |
| Iron, Fe | 2.0-4.0 |
| Nickel | ≤1.0 |
| Lead, Pb | ≤0.2 |
| Tin, Sn | ≤0.2 |
Physical Properties
The following table details the physical properties of copper alloy UNS C86200.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.90 g/cc | 0.285 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C86200 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 C86200.
| 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 C86200 include:
ASTM B271
ASTM B30
ASTM B505
ASTM B584
ASTM B763
QQ C390
QQ C523
SAE J461
SAE J462
Fabrication and Heat Treatment
Machinability
Copper alloy UNS C86200 has a machinability rating of 30.
Welding
The preferred welding techniques for UNS C86200 are oxyacetylene welding, gas shielded arc welding and coated metal arc welding. Carbon arc welding, soldering and brazing are not recommended for this alloy.
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