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Grade CW2M Nickel vs. R30021 Cobalt

Grade CW2M nickel belongs to the nickel alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 25% 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 (8, in this case) are not shown.

For each property being compared, the top bar is grade CW2M nickel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
9.0
Fatigue Strength, MPa 190
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
86
Tensile Strength: Ultimate (UTS), MPa 560
700
Tensile Strength: Yield (Proof), MPa 310
500

Thermal Properties

Latent Heat of Fusion, J/g 330
330
Melting Completion (Liquidus), °C 1520
1350
Melting Onset (Solidus), °C 1460
1190
Specific Heat Capacity, J/kg-K 430
450
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.4
Embodied Carbon, kg CO2/kg material 12
8.0
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 290
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
57
Resilience: Unit (Modulus of Resilience), kJ/m3 220
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 18
23
Strength to Weight: Bending, points 17
21
Thermal Shock Resistance, points 16
21

Alloy Composition

Carbon (C), % 0 to 0.020
0.2 to 0.35
Chromium (Cr), % 15 to 17.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 0 to 2.0
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 15 to 17.5
4.5 to 6.0
Nickel (Ni), % 60.1 to 70
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.8
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0 to 1.0
0