CuCr1Zr Description

CuCr1Zr, mat. No CW106C, is counted among hardenable, low alloyed copper alloys. To the comparable make CuCrZr, mat. No 2.1293, acc. to DIN 17666 : 1983-12 applies: The strength values of CuCrZr are more favorable than of CuCr especially at higher temperatures. CuCrZr shows the following properties: high strength at room temperature, high temperature for removal of workhardening, high creep strength, no notch sensitivity at increased temperatures. Temperature for removal of workhardening approximates 500°C. Favorable electrical and thermal conductivity. Processing properties: hot and cold forming: good machinability: moderately soft soldering: moderately hard soldering: moderately gas shielded welding: moderately burnishing: good Application: For live springs and contacts, electrodes for resistance welding.

A European copper alloy forging standard for CuCr1Zr CW106C which is a high copper alloy containing a small amount of chromium & zirconium that improve its mechanical performance. Copper on its own has outstanding electrical and heat transfer properties but is soft and ductile. However the small additions of these elements followed by a suitable heat treatment significantly increases strength and hardness while retaining high conductivity values. The alloy can also be manufactured to the following specifications EN 12167/12165/12163 CW106C, BS 2872/2874 CC102 and DIN 17672/17673/17678-1 W Nr 2.1293.

DescriptionCopper Chromium Zirconium
Nominal CompositionCuCr1Zr
Alloy TypeWrought

CuCr1Zr Typical Mechanical Properties

Tensile Strength (N/mm²)380
Proof/Yield Strength (N/mm²)300
Elongation (%)15
Hardness Brinell130
Impact Izod J20°C

CuCr1Zr Typical Physical Properties

Density g/cm³8.9
Melting Temperature Range °C1070-1080
Thermal Conductivity W/mK320
Electrical Resistivity μΩ.m15°C2.15
Coefficient of Thermal Expansion 0-250°C16.45
Relative Magnetic Permeability< 1.01
Coefficient of Friction

CuCr1Zr Equivalent Specifications

BS EN 12420 1999 CW106C
BS EN 12165 1998 CW 106C
BS EN 12163 2011 CW 106C
DIN 17665 2.1293
DIN 17672 2.1293
DIN 44759
ASTM B C18150
RWMA Class 11
MIL 19311
NFA 82100

Key Features

A high copper alloy with small additions of chromium and zirconium, that can be heat treated by quench and precipitation hardening.The addition of Zirconium helps prevent electrode sticking during the spot welding of galvanised steel.

Typical Uses

A high copper alloy with extremely good electrical and heat conductivity that is strengthened by heat treatment.

The main applications are for electrical connectors,switch gear and circuit breakers which require higher mechanical properties.It is also used in generators for commutor bars and end rings for electric motors.


Used for welding wheels,spotwelding electrodes.seam welding wheels and tips.Electrode holders and arms; oxygen jet tips. Moulds inserts for non ferrous casting moulds.