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R30021 Cobalt vs. S32053 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S32053 stainless steel belongs to the iron 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 (10, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S32053 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
46
Fatigue Strength, MPa 250
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
730
Tensile Strength: Yield (Proof), MPa 500
330

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
6.1
Embodied Energy, MJ/kg 110
83
Embodied Water, L/kg 520
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
270
Resilience: Unit (Modulus of Resilience), kJ/m3 570
270
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
25
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 3.8
3.3
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.030
Chromium (Cr), % 26 to 29
22 to 24
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
41.7 to 48.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
5.0 to 6.0
Nickel (Ni), % 2.0 to 3.0
24 to 26
Nitrogen (N), % 0
0.17 to 0.22
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.010