Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Hot Working Cold Working Annealing
Introduction
Pure copper has good electrical and thermal conductivity. More than 400 varieties of copper alloys are available. UNS C18900 copper alloys are high copper alloys and are available in the form of wire and rod. They have good corrosion resistance and forgeability.
The following datasheet gives an overview of UNS C18900 copper alloys.
Chemical Composition
The chemical composition of UNS C18900 copper alloys is tabulated below.
| Element |
Content (%) |
| Cu |
98.75 |
| Sn |
0.75 |
| Si |
0.3 |
| Mn |
0.2 |
Physical Properties
The following table shows physical properties of UNS C18900 copper alloys.
| Properties |
Metric |
Imperial |
| Density |
8.89 g/cm3 |
0.321 lb/in3 |
Mechanical Properties
The mechanical properties of UNS C18900 copper alloys are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
262 - 655 MPa |
38000 - 95000 psi |
| Yield strength (depending on temper) |
62 - 359 MPa |
8990 - 52100 psi |
| Elongation at break (in 355.6 mm) |
48% |
48% |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
Other Designations
Other designations equivalent to UNS C18900 copper alloys include MIL E-45829 alloys.
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C18900 copper alloys is 20.
Welding
UNS C18900 copper alloys can be welded using various welding methods such as brazing, soldering, gas shielded arc welding, oxyacetylene welding, spot welding, butt welding, and coated metal arc welding.
Hot Working
UNS C18900 copper alloys have good hot forming capacity.
Cold Working
UNS C18900 copper alloys have good cold working capacity.
Annealing
Annealing of UNS C18900 copper alloys can be done at temperatures ranging from 496 to 594°C (925 to 1100°F).