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C72150 Copper-nickel vs. R30816 Cobalt

C72150 copper-nickel belongs to the copper alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 99
280
Elastic (Young's, Tensile) Modulus, GPa 150
210
Elongation at Break, % 29
23
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 55
81
Tensile Strength: Ultimate (UTS), MPa 490
1020
Tensile Strength: Yield (Proof), MPa 210
460

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1210
1540
Melting Onset (Solidus), °C 1250
1460
Specific Heat Capacity, J/kg-K 410
420
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 8.9
9.1
Embodied Carbon, kg CO2/kg material 6.1
20
Embodied Energy, MJ/kg 88
320
Embodied Water, L/kg 270
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 150
510
Stiffness to Weight: Axial, points 9.1
13
Stiffness to Weight: Bending, points 20
22
Strength to Weight: Axial, points 15
31
Strength to Weight: Bending, points 15
25
Thermal Diffusivity, mm2/s 6.0
3.3
Thermal Shock Resistance, points 18
28

Alloy Composition


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Carbon (C), % 0 to 0.1
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 52.5 to 57
0
Iron (Fe), % 0 to 0.1
0 to 5.0
Lead (Pb), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.050
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 43 to 46
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.5
0