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R30021 Cobalt vs. S32654 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S32654 stainless steel belongs to the iron alloys. They have a modest 34% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S32654 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
45
Fatigue Strength, MPa 250
450
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
82
Tensile Strength: Ultimate (UTS), MPa 700
850
Tensile Strength: Yield (Proof), MPa 500
490

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 15
11
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.0
6.4
Embodied Energy, MJ/kg 110
87
Embodied Water, L/kg 520
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
330
Resilience: Unit (Modulus of Resilience), kJ/m3 570
570
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
29
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 3.8
2.9
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.020
Chromium (Cr), % 26 to 29
24 to 25
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.3 to 0.6
Iron (Fe), % 0 to 3.0
38.3 to 45.3
Manganese (Mn), % 0
2.0 to 4.0
Molybdenum (Mo), % 4.5 to 6.0
7.0 to 8.0
Nickel (Ni), % 2.0 to 3.0
21 to 23
Nitrogen (N), % 0
0.45 to 0.55
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0
0 to 0.0050