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R30012 Cobalt vs. S21600 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while S21600 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
46
Fatigue Strength, MPa 320
360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 830
710
Tensile Strength: Yield (Proof), MPa 650
390

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1280
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
3.6
Embodied Energy, MJ/kg 120
50
Embodied Water, L/kg 480
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
270
Resilience: Unit (Modulus of Resilience), kJ/m3 960
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
25
Strength to Weight: Bending, points 22
23
Thermal Shock Resistance, points 23
15

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.080
Chromium (Cr), % 27 to 32
17.5 to 22
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
57.6 to 67.8
Manganese (Mn), % 0
7.5 to 9.0
Molybdenum (Mo), % 0 to 1.0
2.0 to 3.0
Nickel (Ni), % 0 to 3.0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0