Sep 20 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Welding Machinability Heat Treatment
Introduction
Brass is a specific term that refers to a variety of copper-zinc alloys having properties that include electrical and thermal conductivity, strength, hardness, wear-resistance, ductility and corrosion-resistance.
Brasses are available in a wide range of colors such as yellow, red, silver and gold etc. These colored brasses are used by designers and architects to improve the inside and outside appearances of buildings.
UNS C85200 alloy is a leaded yellow brass copper alloy. The following datasheet provides an overview of UNS C85200 alloy.
Chemical Composition
The chemical composition of UNS C85200 leaded yellow brass copper alloy is outlined in the following table.
| Element |
Content (%) |
| Cu |
72 |
| Sn |
1 |
| Pb |
3 |
| Zn |
24 |
Physical Properties
The following table shows the physical properties of UNS C85200 leaded yellow brass copper alloy.
| Properties |
Metric |
Imperial |
| Density |
8.50 g/cm3 |
0.307 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C85200 leaded yellow brass copper alloy are displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell |
45 |
45 |
| Tensile strength |
260 MPa |
37700 psi |
| Yield strength (@strain 0.500%) |
90.0 MPa |
13100 psi |
| Elongation at break (In 50 mm) |
35.00% |
35.00% |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
80 |
80 |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The thermal properties of UNS C85200 leaded yellow brass copper alloy are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-100°C/68-212°F) |
21.0 µm/m°C |
11.7 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
83.9 W/mK |
582 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C85200 alloy are:
- ASTM B271
- ASTM B30
- ASTM B584
- ASTM B763
- QQ C390
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Welding
Welding processes suitable for UNS C85200 alloy include oxyacetylene welding, soldering and brazing. Coated metal arc welding, carbon arc welding and gas shielded arc welding are not recommended for this alloy.
Machinability
The machinability rating of UNS C85200 alloy is 80.
Heat Treatment
UNS C85200 alloy has stress relieving temperature of 260°C (500°F). This alloy does not react to heat treatment. The time at temperature for this alloy is one hour per inch of section thickness.