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R30021 Cobalt vs. N08366 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while N08366 stainless steel belongs to the iron alloys. They have a modest 31% 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 N08366 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
34
Fatigue Strength, MPa 250
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
590
Tensile Strength: Yield (Proof), MPa 500
240

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
460
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
6.2
Embodied Energy, MJ/kg 110
84
Embodied Water, L/kg 520
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
160
Resilience: Unit (Modulus of Resilience), kJ/m3 570
150
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
20
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 3.8
3.4
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.035
Chromium (Cr), % 26 to 29
20 to 22
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
42.4 to 50.5
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
6.0 to 7.0
Nickel (Ni), % 2.0 to 3.0
23.5 to 25.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030