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R31538 Cobalt vs. Nickel 825

R31538 cobalt belongs to the cobalt alloys classification, while nickel 825 belongs to the nickel alloys. They have a modest 26% 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 (7, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is nickel 825.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
34
Fatigue Strength, MPa 310 to 480
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
650
Tensile Strength: Yield (Proof), MPa 580 to 930
260

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 13
11
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.1
7.2
Embodied Energy, MJ/kg 110
100
Embodied Water, L/kg 530
230

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
180
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
170
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
22
Strength to Weight: Bending, points 27 to 32
20
Thermal Diffusivity, mm2/s 3.5
2.9
Thermal Shock Resistance, points 25 to 33
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.2
Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
19.5 to 23.5
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
1.5 to 3.0
Iron (Fe), % 0 to 0.75
22 to 37.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
2.5 to 3.5
Nickel (Ni), % 0 to 1.0
38 to 46
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 0.050
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
0.6 to 1.2