W 240 - Copper Cobolt Nickel

(Identical to or equivalent to : ISO-Cu Co1 Ni1 Be, CW 103 C, etc.)

Type of material:

High tensile copper

Chemical composition (nom.)

• Cu Rem.
• Co 0.8-1.3 %
• Ni 0.8-1.3 %
• Be 0.4-0.7 %
• Impurities:
  Others 0.5 % max.

Physical properties (principal values)

Coefficient of Thermal Expansion (10-6/K): 17
Thermal conductivity (W/mK): 250
Electrical conductivity (m/W ohm mm2): 26-30
Modulus of Elasticity E (kN/mm2): 135
Density (g/cm3): 8.8

Mechanical properties

Yield strength (Rp N/mm2): 700 N/mm2
Tensile strenght (Rm N/mm2)): 780 N/mm2
Elongation in % A5: 10.0-15.0 %
Hardness /Brinell: 250 HB
Hardness/Rockwell: 92-100 HRB

(values above are nominal and valid for extruded or forged material)

Material description and areas of use

Copper-Cobalt-Nickel-alloy with Beryllium is a material with high resistance values and good thermal- and electrical conductivity. In comparison with alloy W 210 (CuCoBe), the Nickel- content partly replaces the Cobalt-content which enables a higher thermal conductivty.
The material meets the demands according to RWMA Class 3
(Resistance Welders Manufacturers Association).
It is used in applications where a combination of high electrical- and thermal conductivity together with high resisitance values in high temperatures is requsted. The material is well suited for welding electrodes for s.c. resistance-welding (MIG). This alloy has higher resistance values than Copper-Chromium (Cu Cr Zr / W 330) and better thermal conductivity than Copper-Cobalt-Beryllium (CuCoBe / W 210) and Copper-Nickel-Silicum (Cu Ni3 Si / W 200).

Examples of areas of use

Welding-electrodes for spot- and seam-welding of stainless steels-, monell- and nickel-alloys, parts to chambermachines for die casting light metals, parts for injection moulding-tools for plastics. Generally an excellent choice wherever high thermal conductivity is requested etc.

Shapes and forms available

Machinecast material (round solids, flats, sheets): X
Sand- or die-cast (die- or sand-cast):
Forged material : X

Beryllium as a substance is cancerogenous. When casted, it changes its matrix structure and the toxic effect is heavily decreased . It is however recommended, that during any operation which is liable to create fumes or dust, to use protection against inhalation or exposure to skin and/or eyes.