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C72150 Copper-nickel vs. R30021 Cobalt

C72150 copper-nickel belongs to the copper alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is C72150 copper-nickel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 150
220
Elongation at Break, % 29
9.0
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 55
86
Tensile Strength: Ultimate (UTS), MPa 490
700
Tensile Strength: Yield (Proof), MPa 210
500

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Melting Completion (Liquidus), °C 1210
1350
Melting Onset (Solidus), °C 1250
1190
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.5
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.9
8.4
Embodied Carbon, kg CO2/kg material 6.1
8.0
Embodied Energy, MJ/kg 88
110
Embodied Water, L/kg 270
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
57
Resilience: Unit (Modulus of Resilience), kJ/m3 150
570
Stiffness to Weight: Axial, points 9.1
15
Stiffness to Weight: Bending, points 20
24
Strength to Weight: Axial, points 15
23
Strength to Weight: Bending, points 15
21
Thermal Diffusivity, mm2/s 6.0
3.8
Thermal Shock Resistance, points 18
21

Alloy Composition


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Carbon (C), % 0 to 0.1
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 52.5 to 57
0
Iron (Fe), % 0 to 0.1
0 to 3.0
Lead (Pb), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.050
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 43 to 46
2.0 to 3.0
Silicon (Si), % 0 to 0.5
0 to 1.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.5
0