Sep 21 2012
Topics Covered
Introduction
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Cold Working
Welding
Forging
Hot Working
Applications
Introduction
UNS C17500 copper-cobalt-beryllium alloys comprise moderate strength and about 50% IACS conductivity. These alloys are available in mill hardened tempers and heat treatable and ductile tempers.
This datasheet provides an overview of UNS C17500 copper-cobalt-beryllium alloys.
Physical Properties
The following table shows the physical properties of UNS C17500 copper-cobalt-beryllium alloys.
|
Properties |
Metric |
Imperial |
|
Density |
8.75 g/cm3 |
0.316 lb/in3 |
|
Melting point |
1885°C |
1029°F |
Mechanical Properties
The mechanical properties of UNS C17500 copper-cobalt-beryllium alloys are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Hardness, Rockwell B (any thickness) |
90.0 |
90.0 |
|
Tensile strength at break (@thickness ≥50.8 mm/ @thickness 2.00 in) |
607 MPa |
88000 psi |
|
Tensile strength at break 9@thickness 25.4-50.8 mm/ @thickness 1.00-2.00 in) |
621 MPa |
90000 psi |
|
Tensile strength at break (@thickness 25.4 mm/ @thickness 1.00 in) |
648 MPa |
94000 psi |
|
Tensile strength, yield (@strain 0.500 %, thickness ≥50.8 mm/ @strain 0.500%, thickness 2.00 in) |
607 MPa |
88000 psi |
|
Tensile strength, yield (@strain 0.500%, thickness 25.4-50.8 mm/ @Strain 0.500%, thickness 1.00 - 2.00 in) |
621 MPa |
90000 psi |
|
Tensile strength, yield (@strain 0.500%, thickness 25.4 mm/ @Strain 0.500 %, thickness 1.00 in) |
648 MPa |
94000 psi |
|
Modulus of elasticity |
131 GPa |
19000 ksi |
|
Poissons ratio |
0.267 |
0.267 |
|
Shear modulus |
51.7 GPa |
7500 ksi |
Other Designations
Equivalent materials to UNS C17500 copper-cobalt-beryllium alloys are:
-
ASTM B441
-
ASTM B534
-
MIL C-81021
-
SAE J461
-
SAE J463
Fabrication and Heat Treatment
Cold Working
UNS C17500 alloys have excellent cold working capacity.
Welding
UNS C17500 alloys are suitable for butt welding, seam welding, brazing, soldering, coated metal arc welding, spot welding and gas shielded arc welding processes. Oxyacetylene welding is not recommended for these alloys.
Forging
Temperatures between 649and 885°C (1200 and 1625°F) are recommended for hot working of UNS C17500 alloys.
Hot Working
UNS C17500 alloys have good hot forming capacity.
Applications
The applications of UNS C17500 alloys include:
-
Corrosion resistant components
-
Electrical/electronic connectors
-
Precision screw machined parts
-
Bearings
-
Plastic molds
-
Current-carrying springs
-
Welding electrodes