W 260 - Copper Cobolt Nickel Beryllium, hard

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

Type of material:

High tensile copper

Chemical composition (nom.)

• Cu Rest.
• 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): 260
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): 730 N/mm2
Tensile strenght (Rm N/mm2)): 820 N/mm2
Elongation in % A5: 10.0-15.0 %
Hardness /Brinell: 270 HB

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

Material description and areas of use

Copper-Cobolt-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 creates 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.k. motståndssvetsning (MIG. This alloy has higher resisitance values than Copper-Chromium (Cu Cr Zr / W 330) and better thermal conductivity than Copper-Cobolt-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.