Leaded high strength yellow brass – copper casting alloy UNS C86400 is a cast brass alloy of manganese bronze and leaded manganese bronze. The chocolate color of UNS C86400 can be attributed to the manganese present in the alloy. The leaded brass is commonly called as architectural bronze. The lead in the alloy enhances the longevity of the alloy and gives it an attractive golden lustre.
The chemical composition of UNS C86400 is given in the following table.
| Element | Content (%) |
|---|---|
| Copper , Cu | 56.0-62.0 |
| Zinc, Zn | 37.0-40.0 |
| Lead, Pb | 0.50-1.50 |
| Iron | ≤2.00 |
| Manganese, Mn | ≤1.50 |
| Tin, Sn | ≤1.50 |
| Aluminium, Al | ≤1.50 |
| Nickel | ≤1.00 |
Physical Properties
The following table details the physical properties of copper alloy UNS C86400.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.32 g/cc | 0.301 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C86400 are shown in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 117 GPa | 16969 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Hardness, Brinell | 105 | 105 |
| Tensile strength | 450 MPa | 65300 psi |
| Yield strength | 170 MPa | 24700 psi |
| Elongation at break | 20.00% | 20.00% |
| Machinability | 60 | 60 |
| Compressive strength | 150 MPa | 21800 psi |
| Charpy impact | 34.0 J | 25.1 ftlb |
| Izod impact | 40.0 J | 29.5 ftlb |
Thermal Properties
The following table outlines the thermal properties of copper alloy UNS C86400.
Machinability
Copper alloy UNS C86400 has a machinability rating of 65.
Welding
The preferred welding techniques for UNS C86400 are soldering and brazing. Carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding are not recommended for this alloy.
