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R31538 Cobalt vs. Nickel 22

R31538 cobalt belongs to the cobalt alloys classification, while nickel 22 belongs to the nickel alloys. They have a modest 29% 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 nickel 22.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 13 to 23
49
Fatigue Strength, MPa 310 to 480
330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
84
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
790
Tensile Strength: Yield (Proof), MPa 580 to 930
360

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1390
Melting Onset (Solidus), °C 1290
1360
Specific Heat Capacity, J/kg-K 450
430
Thermal Conductivity, W/m-K 13
10
Thermal Expansion, µm/m-K 13
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.9
Embodied Carbon, kg CO2/kg material 8.1
12
Embodied Energy, MJ/kg 110
170
Embodied Water, L/kg 530
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
320
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
300
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 34 to 45
25
Strength to Weight: Bending, points 27 to 32
21
Thermal Diffusivity, mm2/s 3.5
2.7
Thermal Shock Resistance, points 25 to 33
24

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.015
Chromium (Cr), % 26 to 30
20 to 22.5
Cobalt (Co), % 58.7 to 68.9
0 to 2.5
Iron (Fe), % 0 to 0.75
2.0 to 6.0
Manganese (Mn), % 0 to 1.0
0 to 0.015
Molybdenum (Mo), % 5.0 to 7.0
12.5 to 14.5
Nickel (Ni), % 0 to 1.0
50.8 to 63
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.080
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 0
0 to 0.35