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R30816 Cobalt vs. C70700 Copper-nickel

R30816 cobalt belongs to the cobalt alloys classification, while C70700 copper-nickel belongs to the copper alloys. 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 R30816 cobalt and the bottom bar is C70700 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
73
Elastic (Young's, Tensile) Modulus, GPa 210
120
Elongation at Break, % 23
39
Poisson's Ratio 0.3
0.34
Shear Modulus, GPa 81
46
Tensile Strength: Ultimate (UTS), MPa 1020
320
Tensile Strength: Yield (Proof), MPa 460
110

Thermal Properties

Latent Heat of Fusion, J/g 300
220
Melting Completion (Liquidus), °C 1540
1120
Melting Onset (Solidus), °C 1460
1060
Specific Heat Capacity, J/kg-K 420
390
Thermal Conductivity, W/m-K 13
59
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.9
Embodied Carbon, kg CO2/kg material 20
3.4
Embodied Energy, MJ/kg 320
52
Embodied Water, L/kg 440
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
100
Resilience: Unit (Modulus of Resilience), kJ/m3 510
51
Stiffness to Weight: Axial, points 13
7.6
Stiffness to Weight: Bending, points 22
19
Strength to Weight: Axial, points 31
10
Strength to Weight: Bending, points 25
12
Thermal Diffusivity, mm2/s 3.3
17
Thermal Shock Resistance, points 28
12

Alloy Composition

Carbon (C), % 0.32 to 0.42
0
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
88.5 to 90.5
Iron (Fe), % 0 to 5.0
0 to 0.050
Manganese (Mn), % 1.0 to 2.0
0 to 0.5
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
9.5 to 10.5
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0
Residuals, % 0
0 to 0.5