Aug 20 2012
Topics Covered
IntroductionChemical
CompositionPhysical PropertiesMechanical PropertiesThermal propertiesOther DesignationsFabrication and Heat
Treatment Machinability Welding
Introduction
UNS C85800 is an alloy of copper, zinc and lead which belongs to
the cast category. Lead present in the alloy offers UNS C85800 copper
alloys high machinability and corrosion resistance. The presence of lead in the
leaded yellow brass – copper casting alloy UNS C85800 acts as a tool lubricant
and microchip chip breaker.
The following datasheet provides chemical composition and properties of UNS
C85800.
Chemical Composition
The chemical composition of UNS C85800 copper alloy is given in the
following table.
| Element |
Content
(%) |
| Copper, Cu |
≥58.0 |
| Zinc, Zn |
35.0 |
| Lead, Pb |
≤1.50 |
| Tin, Sn |
≤1.50 |
| Iron, Fe |
≤0.50 |
| Manganese, Mn |
≤0.25 |
| Other |
≤0.50 |
Physical Properties
The following table details the physical properties of UNS C85800.
| Properties |
Metric |
Imperial |
| Density |
8.41 g/cc |
0.304 lb/in³ |
Mechanical Properties
The mechanical properties of copper alloy UNS C85800 are shown in the
following table.
| Properties |
Metric |
Imperial |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
| Hardness, Rockwell B |
102 |
102 |
| Tensile strength |
380 MPa |
55100 psi |
| Yield strength |
205 MPa |
29700 psi |
| Elongation at break |
15.00% |
15.00% |
| Machinability |
80 |
80 |
Thermal properties
The following table discusses the thermal properties of UNS C85800.
| 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) |
83.9 W/mK |
582 BTUin/hr.ft².°F |
Other Designations
Equivalent designations to copper alloy UNS C85800 include:
- ASTM B176
- ASTM B30
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Machinability
UNS C85800 has a machinability rating of 80.
Welding
The preferred welding techniques for copper alloy UNS C85800 are soldering
and brazing. Carbon arc welding, oxyacetylene welding, gas shielded arc welding
and coated metal arc welding are not recommended for this alloy.