W 340 - Copper-Chromium-Zirkonium

(Identical to or equivalent to: ISO-CuCr1Zr, CW106C, Elbrodur, Mallory 328)

Type of material:

High tensile copper

Chemical composition (nom.)

• Cu Rest.
• Cr 0.5-1.2 %
• Zr 0.03-0.3 %
• Impurities:
  Others 0.2 % max.

Physical properties (principal values)

Coefficient of Thermal Expansion (10-6/K): 17
Thermal conductivity (W/mK): 330
Electrical conductivity (m/W ohm mm2): 44-49
Modulus of Elasticity E (kN/mm2): 138
Density (g/cm3): 8.9

Mechanical properties

Yield strength (Rp N/mm2): 350 N/mm2
Tensile strenght (Rm N/mm2)): 400 N/mm2
Elongation in % A5: 15.0 %
Hardness /Brinell: 105-170 HB
Hardness/Rockwell: 72-80 HRB

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

Material description and areas of use

Chromium-Copper with Zirkonium is a material with high resistance values and good thermal- and electrical conductivity.
The material meets the demands according to RWMA Class 2
(Resistance Welders Manufacturers Association).
It is used in applications where a combination of high electrical- and thermal conductivity together with high resistance values in high temperatures is requsted. The material is well suited for welding electrodes for s.c. resistance welding (MIG), as it leads the heat away from the welding area and at the same time is hard enough to handle the mechanical pressure. The material can be extra hardened during manufacturing through heat-treatment in combination with coldworking.

Examples of areas of use

Welding electrodes, dies/moulds for continous casting of steel and aluminum, electrical components, switches, turbine parts (in combination with high temperature) etc.

Shapes and forms available

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