W-240 (CW103C)

Beryllium copper (CuCo1Ni1Be).

W-240 is a beryllium copper alloy with elevated values for strength and conductivity. This alloy is well suited for applications that demands material with high electric and thermal conductivity in combination with high strength properties also at high temperatures.


Areas of use
Electrodes material for resistance stud welding, chill-mould, die casting ram, Details for plastics making, mould inserts for thermal demands, mould cores, hot runner nozzles etc.




Chemical composition (nom.)
Cu Rest.
Co 0.8-1.3 %
Ni 0.8-1.3 %
Be 0.4-0.7 %

Max impurities
Other. 0.5 % max.

Physical properties
Mean linear coefficient of thermal expansion (10-6/K): 17
Thermal conductivity (W/mK): 250
Electrical conductivity (m/W ohm mm2): 26-30
Elastisity modulus E (kN/mm2): 135
Density (g/cm3): 8.8

Mechanical properties
Yield strength (Rp N/mm²): 496-550 N/mm²
Tensile strength (Rm N/mm²): 700-900 N/mm²
Elongation in % A5: 10.0-17.0%
Hardness/Brinell: 217-240 HB
Hardness/Rockwell: 100 HRB

Additional information