May 23 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications
Introduction
The UNS numbers C50000 to C59999 indicate phosphor bronzes. They are a group of copper alloys with tin and phosphorus playing a bigger role.
Copper UNS C51800 is a wrought alloy. The following datasheet discusses the chemical composition and properties of copper UNS C51800.
Chemical Composition
The chemical composition of copper UNS C51800 is given in the following table.
|
Element |
Content (%) |
|
Tin, Sn |
4-6 |
|
Phosphorous, P |
0.10-0.35 |
|
Lead, Pb |
0.02 |
|
Copper, Cu |
Balance |
Physical Properties
The following table discusses the physical properties of copper UNS C51800.
|
Properties |
Metric |
Imperial |
|
Density |
8.9 g/cm3 |
0.323 lb/in3 |
|
Melting point (solidus) |
1060°C |
1940°F |
Mechanical Properties
The mechanical properties of copper UNS C51800 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Modulus of elasticity (@20°C/68°F) |
121 GPa |
17549 ksi |
|
Poisson’s ratio |
0.35 |
0.35 |
Thermal Properties
The thermal properties of copper UNS C51800 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-300°C/68-392°F) |
18 x 10-6 °C |
10 x 10-6/°F |
|
Thermal conductivity (@20°C/68°F) |
93-96W/mK |
35-56 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to copper UNS C51800 include:
Fabrication
Machinability - The machinability of copper UNS C51800 alloy is rated at 20.
Welding - Welding methods such as butt resistance welding, soldering and brazing are considered as excellent for this alloy. Gas shielded arc welding and spot resistance welding are rated as good while coated metal arc welding, seam resistance welding, and oxyacetylene welding are rated as fair.
Hot working - Copper UNS C51800 alloy has limited hot working abilities. The hot working temperature for this alloy ranges between 650 and 750 °C (1205 and 1382°F)
Cold working - Copper UNS C51800 alloy has excellent cold working properties.
Annealing - Copper UNS C51800 alloy is annealed at temperatures ranging between 500 – 700 °C (932 and 1292 ºF).
Applications
Copper UNS C51800 is used in the following areas:
-
Hardware applications - lock springs and fasteners
-
Electrical applications - terminal connectors, fuse clips, contacts, switch parts, and springs
-
Industrial application - sleeve bushings, diaphragms, bellows, and press tools
-
Engineering applications - clutch discs, lock washers, and bridge bearing plates