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R30075 Cobalt vs. C72900 Copper-nickel

R30075 cobalt belongs to the cobalt alloys classification, while C72900 copper-nickel belongs to the copper alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is C72900 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
120
Elongation at Break, % 12
6.0 to 20
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 82 to 98
45
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
870 to 1080
Tensile Strength: Yield (Proof), MPa 480 to 840
700 to 920

Thermal Properties

Latent Heat of Fusion, J/g 320
210
Melting Completion (Liquidus), °C 1360
1120
Melting Onset (Solidus), °C 1290
950
Specific Heat Capacity, J/kg-K 450
380
Thermal Conductivity, W/m-K 13
29
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 8.1
4.6
Embodied Energy, MJ/kg 110
72
Embodied Water, L/kg 530
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
49 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
2030 to 3490
Stiffness to Weight: Axial, points 14 to 17
7.6
Stiffness to Weight: Bending, points 24 to 25
19
Strength to Weight: Axial, points 26 to 42
27 to 34
Strength to Weight: Bending, points 22 to 31
23 to 27
Thermal Diffusivity, mm2/s 3.5
8.6
Thermal Shock Resistance, points 21 to 29
31 to 38

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
74.1 to 78
Iron (Fe), % 0 to 0.75
0 to 0.5
Lead (Pb), % 0
0 to 0.020
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0 to 1.0
0 to 0.3
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
14.5 to 15.5
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.010
0
Tin (Sn), % 0
7.5 to 8.5
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0
Zinc (Zn), % 0
0 to 0.5
Residuals, % 0
0 to 0.3