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R30021 Cobalt vs. S82012 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S82012 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 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S82012 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
40
Fatigue Strength, MPa 250
480
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 32
27
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 700
800
Tensile Strength: Yield (Proof), MPa 500
560

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
2.4
Embodied Energy, MJ/kg 110
35
Embodied Water, L/kg 520
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
290
Resilience: Unit (Modulus of Resilience), kJ/m3 570
790
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
29
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 3.8
3.9
Thermal Shock Resistance, points 21
23

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 29
19 to 20.5
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
71.3 to 77.9
Manganese (Mn), % 0
2.0 to 4.0
Molybdenum (Mo), % 4.5 to 6.0
0.1 to 0.6
Nickel (Ni), % 2.0 to 3.0
0.8 to 1.5
Nitrogen (N), % 0
0.16 to 0.26
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 0.8
Sulfur (S), % 0
0 to 0.0050