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R31538 Cobalt vs. N06985 Nickel

R31538 cobalt belongs to the cobalt alloys classification, while N06985 nickel belongs to the nickel alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R31538 cobalt and the bottom bar is N06985 nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
45
Fatigue Strength, MPa 310 to 480
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
690
Tensile Strength: Yield (Proof), MPa 580 to 930
260

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1350
Melting Onset (Solidus), °C 1290
1260
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
10
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.1
8.8
Embodied Energy, MJ/kg 110
120
Embodied Water, L/kg 530
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
250
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
160
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
23
Strength to Weight: Bending, points 27 to 32
21
Thermal Diffusivity, mm2/s 3.5
2.6
Thermal Shock Resistance, points 25 to 33
16

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.015
Chromium (Cr), % 26 to 30
21 to 23.5
Cobalt (Co), % 58.7 to 68.9
0 to 5.0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 0.75
18 to 21
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
6.0 to 8.0
Nickel (Ni), % 0 to 1.0
35.9 to 53.5
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0 to 1.5