Sep 13 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Forging
Hot Working
Cold Working
Applications
Introduction
UNS C18200 chromium copper alloys are primary alloys, which are heat treated and cold worked to provide electrical conductivity of 80% IACS and hardness. They are used in applications that require deformation resistance at high temperatures.
The following datasheet will discuss in detail about UNS C18200 chromium copper alloy.
Chemical Composition
The following table shows the chemical composition of UNS C18200 copper alloys.
|
Element |
Content (%) |
|
Cu |
99.1 |
|
Cr |
0.9 |
Physical Properties
The physical properties of UNS C18200 copper alloys are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.89 g/cm3 |
0.321 lb/in3 |
|
Melting point |
1070°C |
1958°F |
Mechanical Properties
The mechanical properties of UNS C18200 copper alloys are tabulated below.
|
Properties |
Metric |
Imperial |
|
Hardness, Rockwell B (50.8 - 76.2 mm/2.00 - 3.00 in) |
65 |
65 |
|
Hardness, Rockwell B (25.4 - 50.8 mm/1.00 - 2.00 in) |
70 |
70 |
|
Hardness, Rockwell B (≤25.4 mm/1.00 in, heat treated) |
75.0 |
75.0 |
|
Tensile strength at break (any thickness) |
379 MPa |
55000 psi |
|
Yield strength (0.500, any thickness) |
379 MPa |
55000 psi |
|
Modulus of elasticity |
117 GPa |
17000 ksi |
|
Poissons ratio |
0.181 |
0.181 |
|
Shear modulus |
49.6 GPa |
7200 ksi |
Thermal Properties
The thermal properties of UNS C18200 copper alloys are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal Conductivity (20.0°C/ 68.0°F) |
323.4 W/mK |
2244 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to UNS C18200 copper alloys include:
Fabrication and Heat Treatment
Machinability
The machinability rating of C18200 copper alloys is 20.
Welding
Welding methods such as soldering, brazing, seam welding and butt welding are preferred for C18200 copper alloys. Oxyacetylene welding, gas shielded arc welding, coated metal arc welding and spot welding are not preferred for this type of alloys.
Forging
C18200 copper alloys are forged at temperatures ranging from 760 to 871°C (1400 to 1600°F). The hot forgeability rating of these alloys is 80.
Hot Working
C18200 copper alloys have good hot working property.
Cold Working
C18200 copper alloys have excellent cold working property.
Applications
The following are the major applications of UNS C18200 copper alloys:
-
Tips
-
Clamps
-
Wheels
-
Electrical and mechanical power transmission devices
-
Circuit breaker parts
-
High-strength fasteners