Copper-Cobalt-Beryllium Alloy UNS C17500

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 [email protected] 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

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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

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