Sep 20 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Welding Machinability Heat Treatment
Introduction
Copper alloys come in many forms with each copper alloy portraying specific properties that suit a number of manufacturing processes, environments and applications. Some common copper alloys include:
- Beryllium copper
- Nickel silver
- Tin bronze
- Brass
- Phosphor bronze
- Gunmetal
- Aluminum bronze
- Copper-nickel
UNS C83800 alloy is a copper casting alloy. The following datasheet provides an overview of UNS C83800 alloy.
Chemical Composition
The chemical composition of UNS C83800 copper casting alloy is outlined in the following table.
| Element |
Content (%) |
| Cu |
83 |
| Sn |
4 |
| Pb |
6 |
| Zn |
7 |
Physical Properties
The following table shows the physical properties of UNS C83800 copper casting alloy.
| Properties |
Metric |
Imperial |
| Density |
8.60 g/cm3 |
0.311 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C83800 copper casting alloy is displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell |
60 |
60 |
| Tensile strength |
240 MPa |
34800 psi |
| Yield strength (@strain 0.500%) |
110 MPa |
16000 psi |
| Elongation at break (in 50 mm) |
25.00% |
25.00% |
| Compressive strength (at permanent set of 0.1%) |
79.0 MPa |
11500 psi |
| Compressive strength (at permanent set of 10%) |
200 MPa |
29000 psi |
| Izod impact |
11.0 J |
8.11 ft-lb |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
90 |
90 |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
Thermal Properties
The thermal properties of UNS C83800 copper casting alloy is given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-232°C/68-450°F) |
18.0 µm/m°C |
10.0 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
72.5 W/mK |
503 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C83800 alloy are:
- QQ C390
- SAE J461
- SAE J462
- ASTM B271
- ASTM B30
- ASTM B505
- ASTM B584
- ASME B16.15
- ASME B16.18
- ASME B16.23
Fabrication and Heat Treatment
Welding
Welding processes suitable for UNS C83800 alloy include coated metal arc welding, grazing and soldering. Welding processes not recommended for this alloy include carbon arc welding, oxyacetylene welding and gas shielded arc welding.
Machinability
The machinability rating for UNS C83800 alloy is 90.
Heat Treatment
UNS C83300 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.