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C71640 Copper-nickel vs. R30016 Cobalt

C71640 copper-nickel belongs to the copper alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
220
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 52
85
Tensile Strength: Ultimate (UTS), MPa 490 to 630
1010
Tensile Strength: Yield (Proof), MPa 190 to 460
580

Thermal Properties

Latent Heat of Fusion, J/g 240
320
Melting Completion (Liquidus), °C 1180
1360
Melting Onset (Solidus), °C 1120
1270
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 29
15
Thermal Expansion, µm/m-K 15
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.9
8.5
Embodied Carbon, kg CO2/kg material 5.0
7.7
Embodied Energy, MJ/kg 73
110
Embodied Water, L/kg 280
500

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 750
770
Stiffness to Weight: Axial, points 8.7
14
Stiffness to Weight: Bending, points 20
24
Strength to Weight: Axial, points 15 to 20
33
Strength to Weight: Bending, points 16 to 18
26
Thermal Diffusivity, mm2/s 8.2
3.9
Thermal Shock Resistance, points 16 to 21
24

Alloy Composition


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Carbon (C), % 0
0.9 to 1.4
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Copper (Cu), % 61.7 to 67.8
0
Iron (Fe), % 1.7 to 2.3
0 to 3.0
Lead (Pb), % 0 to 0.050
0
Manganese (Mn), % 1.5 to 2.5
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 29 to 32
0 to 3.0
Silicon (Si), % 0
0.2 to 2.0
Tungsten (W), % 0
3.5 to 5.5
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0