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 C84800 alloy is a leaded red brass copper alloy. The following datasheet provides an overview of UNS C84800 alloy.
Chemical Composition
The chemical composition of UNS C84800 leaded red brass copper alloy is outlined in the following table.
| Element |
Content (%) |
| Cu |
76 |
| Sn |
3 |
| Pb |
6 |
| Zn |
15 |
Physical Properties
The following table shows the physical properties of UNS C84800 leaded red brass copper alloy.
| Properties |
Metric |
Imperial |
| Density |
8.58 g/cm3 |
0.310 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C84800 leaded red brass copper alloy are displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell |
55 |
55 |
| Tensile strength |
255 MPa |
37000 psi |
| Yield strength (@strain 0.500%) |
97.0 MPa |
14100 psi |
| Elongation at break (in 50 mm) |
35.00% |
35.00% |
| Creep strength (for 10E-5%/h, at 288°C) |
20.0 MPa |
2900 psi |
| Creep strength (for 10E-5%/h, at 204°C) |
55.0 MPa |
7980 psi |
| Creep strength (for 10E-5%/h, at 177°C) |
82.0 MPa |
11900 psi |
| Compressive strength (at permanent set of 1%) |
88.3 MPa |
12800 psi |
| Compressive strength (at permanent set of 0.1%) |
88.3 MPa |
12800 psi |
| Compressive strength (at permanent set of 1%) |
109 MPa |
15800 psi |
| Compressive strength (at permanent set of 10%) |
236 MPa |
34200 psi |
| Charpy impact (V-notch) |
16.0 J |
11.8 ft-lb |
| Fatigue strength (@# of cycles 1.00e+8) |
76.0 MPa |
11000 psi |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
90 |
90 |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The thermal properties of UNS C84800 leaded red brass copper alloy are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-260°C/68-500°F) |
18.7 µm/m°C |
10.4 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
72.0 W/mK |
500 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C84800 alloy are:
- ASTM B271
- ASTM B30
- ASTM B505
- ASTM B584
- ASTM B763
- QQ C390
Fabrication and Heat Treatment
Welding
Welding processes recommended for UNS C84800 alloy include coated metal arc welding, brazing and soldering. Welding processes not recommended for this alloy include gas shielded arc welding, carbon arc welding and oxyacetylene welding.
Machinability
The machinability rating of UNS C84800 alloy is 90.
Heat Treatment
UNS C84800 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.