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R31233 Cobalt vs. S21900 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S21900 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 (7, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
50
Fatigue Strength, MPa 220
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 1020
710
Tensile Strength: Yield (Proof), MPa 420
390

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1350
1400
Melting Onset (Solidus), °C 1330
1350
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.9

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 8.4
3.0
Embodied Energy, MJ/kg 110
43
Embodied Water, L/kg 480
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
300
Resilience: Unit (Modulus of Resilience), kJ/m3 410
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
26
Strength to Weight: Bending, points 26
23
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 25
15

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.080
Chromium (Cr), % 23.5 to 27.5
19 to 21.5
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
59.4 to 67.4
Manganese (Mn), % 0.1 to 1.5
8.0 to 10
Molybdenum (Mo), % 4.0 to 6.0
0
Nickel (Ni), % 7.0 to 11
5.5 to 7.5
Nitrogen (N), % 0.030 to 0.12
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
0