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R30021 Cobalt vs. N08332 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while N08332 stainless steel belongs to the iron alloys. They have a modest 23% 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 N08332 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
34
Fatigue Strength, MPa 250
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 700
520
Tensile Strength: Yield (Proof), MPa 500
210

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1390
Melting Onset (Solidus), °C 1190
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
16

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.0
5.4
Embodied Energy, MJ/kg 110
77
Embodied Water, L/kg 520
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
140
Resilience: Unit (Modulus of Resilience), kJ/m3 570
110
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
3.1
Thermal Shock Resistance, points 21
12

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.050 to 0.1
Chromium (Cr), % 26 to 29
17 to 20
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
38.3 to 48.2
Lead (Pb), % 0
0 to 0.0050
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
34 to 37
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0.75 to 1.5
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 0
0 to 0.025