Aug 20 2012
Topics Covered
IntroductionChemical
CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat
Treatment Machinability Welding
Introduction
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 following datasheet provides the chemical composition and properties of
copper alloy UNS C86400.
Chemical Composition
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.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@21.0 –
204°C/69.8-399°F) |
20.0 µm/m°C |
11.1 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
88.0 W/mK |
611 BTU in/hr.ft².°F |
Other Designations
Equivalent designations to UNS C86400 include:
- ASTM B271
- ASTM B30
- ASTM B505
- ASTM B584
- ASTM B763
- QQ C390
- QQ C523
Fabrication and Heat Treatment
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.