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R30021 Cobalt vs. N08811 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while N08811 stainless steel belongs to the iron alloys. They have a modest 26% 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 (8, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is N08811 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
33
Fatigue Strength, MPa 250
150
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 700
510
Tensile Strength: Yield (Proof), MPa 500
190

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1390
Melting Onset (Solidus), °C 1190
1360
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.0
5.3
Embodied Energy, MJ/kg 110
76
Embodied Water, L/kg 520
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
130
Resilience: Unit (Modulus of Resilience), kJ/m3 570
94
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
18
Strength to Weight: Bending, points 21
18
Thermal Diffusivity, mm2/s 3.8
3.0
Thermal Shock Resistance, points 21
13

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.6
Carbon (C), % 0.2 to 0.35
0.060 to 0.1
Chromium (Cr), % 26 to 29
19 to 23
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 3.0
39.5 to 50.6
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
30 to 35
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.15 to 0.6