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R30816 Cobalt vs. Grade N7M Nickel

R30816 cobalt belongs to the cobalt alloys classification, while grade N7M nickel belongs to the nickel alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
22
Fatigue Strength, MPa 250
190
Poisson's Ratio 0.3
0.31
Shear Modulus, GPa 81
85
Tensile Strength: Ultimate (UTS), MPa 1020
590
Tensile Strength: Yield (Proof), MPa 460
310

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1540
1650
Melting Onset (Solidus), °C 1460
1590
Specific Heat Capacity, J/kg-K 420
390
Thermal Expansion, µm/m-K 12
9.9

Otherwise Unclassified Properties

Density, g/cm3 9.1
9.3
Embodied Carbon, kg CO2/kg material 20
16
Embodied Energy, MJ/kg 320
200
Embodied Water, L/kg 440
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
110
Resilience: Unit (Modulus of Resilience), kJ/m3 510
220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
22
Strength to Weight: Axial, points 31
18
Strength to Weight: Bending, points 25
17
Thermal Shock Resistance, points 28
19

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.070
Chromium (Cr), % 19 to 21
0 to 1.0
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
0 to 3.0
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
30 to 33
Nickel (Ni), % 19 to 21
60.9 to 70
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0