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R31233 Cobalt vs. S21460 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S21460 stainless steel belongs to the iron alloys. They have a modest 28% 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 (10, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is S21460 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
46
Fatigue Strength, MPa 220
390
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1020
830
Tensile Strength: Yield (Proof), MPa 420
430

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1350
1380
Melting Onset (Solidus), °C 1330
1330
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.6
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
320
Resilience: Unit (Modulus of Resilience), kJ/m3 410
460
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
30
Strength to Weight: Bending, points 26
26
Thermal Shock Resistance, points 25
17

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.12
Chromium (Cr), % 23.5 to 27.5
17 to 19
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
57.3 to 63.7
Manganese (Mn), % 0.1 to 1.5
14 to 16
Molybdenum (Mo), % 4.0 to 6.0
0
Nickel (Ni), % 7.0 to 11
5.0 to 6.0
Nitrogen (N), % 0.030 to 0.12
0.35 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.060
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