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R30021 Cobalt vs. N08020 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while N08020 stainless steel belongs to the iron alloys. They have a modest 27% 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 (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is N08020 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
15 to 34
Fatigue Strength, MPa 250
210 to 240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 700
610 to 620
Tensile Strength: Yield (Proof), MPa 500
270 to 420

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1410
Melting Onset (Solidus), °C 1190
1360
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.0
6.6
Embodied Energy, MJ/kg 110
92
Embodied Water, L/kg 520
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
83 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 570
180 to 440
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
21
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 21
15

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.070
Chromium (Cr), % 26 to 29
19 to 21
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 0 to 3.0
29.9 to 44
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
2.0 to 3.0
Nickel (Ni), % 2.0 to 3.0
32 to 38
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.035