CoCu1Ni1Be  BeCu Square Bar consists of around 1% Cobalt, 1% Nickel, and 0.5% Beryllium. After hot forging and heat treatment, this alloy develops significant hardness, as well as electrical and thermal conductivity. Varying the heat-treatment parameters can yield different combinations of electrical conductivity and hardness. CuCo1Ni1Be also demonstrates strength and hardness coupled with conductivity within 45–60% of copper, with ultimate tensile and hardness values nearing 140 ksi and 100 RB, respectively.

Chemical Composition

Be: 0.40-0.70%
Co: 0.80-1.30%
Ni: 0.80-1.30%
Cu: Balance
Note: Copper plus additions equal 99.5% minimum.

Typical Physical Properties

Density (g/cm3): 8.83
Density before age hardening (g/cm3): 8.75
Elastic Modulus (kg/mm2 (103)): 14.10
Thermal Expansion Coefficient (20 °C to 200 °C m/m/°C): 17 x 10-6
Thermal Conductivity: 209 W/m • oK at 20 C
Melting Range (°C): 1000-1070