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R31233 Cobalt vs. S30601 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S30601 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 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is S30601 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
37
Fatigue Strength, MPa 220
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 1020
660
Tensile Strength: Yield (Proof), MPa 420
300

Thermal Properties

Latent Heat of Fusion, J/g 320
370
Melting Completion (Liquidus), °C 1350
1360
Melting Onset (Solidus), °C 1330
1310
Specific Heat Capacity, J/kg-K 440
500
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.6
Embodied Carbon, kg CO2/kg material 8.4
3.9
Embodied Energy, MJ/kg 110
55
Embodied Water, L/kg 480
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
200
Resilience: Unit (Modulus of Resilience), kJ/m3 410
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
24
Strength to Weight: Bending, points 26
22
Thermal Shock Resistance, points 25
16

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.015
Chromium (Cr), % 23.5 to 27.5
17 to 18
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 1.0 to 5.0
56.9 to 60.5
Manganese (Mn), % 0.1 to 1.5
0.5 to 0.8
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.2
Nickel (Ni), % 7.0 to 11
17 to 18
Nitrogen (N), % 0.030 to 0.12
0 to 0.050
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.050 to 1.0
5.0 to 5.6
Sulfur (S), % 0 to 0.020
0 to 0.013
Tungsten (W), % 1.0 to 3.0
0