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R30021 Cobalt vs. S20910 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S20910 stainless steel belongs to the iron alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
14 to 39
Fatigue Strength, MPa 250
310 to 460
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 700
780 to 940
Tensile Strength: Yield (Proof), MPa 500
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 520
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
120 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 570
460 to 1640
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
28 to 33
Strength to Weight: Bending, points 21
24 to 27
Thermal Diffusivity, mm2/s 3.8
3.6
Thermal Shock Resistance, points 21
17 to 21

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.060
Chromium (Cr), % 26 to 29
20.5 to 23.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
52.1 to 62.1
Manganese (Mn), % 0
4.0 to 6.0
Molybdenum (Mo), % 4.5 to 6.0
1.5 to 3.0
Nickel (Ni), % 2.0 to 3.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3