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S31727 Stainless Steel vs. R31233 Cobalt

S31727 stainless steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 36% 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 (12, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 40
17
Fatigue Strength, MPa 240
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 630
1020
Tensile Strength: Yield (Proof), MPa 270
420

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1440
1350
Melting Onset (Solidus), °C 1390
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.6
Embodied Carbon, kg CO2/kg material 4.7
8.4
Embodied Energy, MJ/kg 64
110
Embodied Water, L/kg 180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
140
Resilience: Unit (Modulus of Resilience), kJ/m3 190
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 22
33
Strength to Weight: Bending, points 20
26
Thermal Shock Resistance, points 14
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.030
0.020 to 0.1
Chromium (Cr), % 17.5 to 19
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
1.0 to 5.0
Manganese (Mn), % 0 to 1.0
0.1 to 1.5
Molybdenum (Mo), % 3.8 to 4.5
4.0 to 6.0
Nickel (Ni), % 14.5 to 16.5
7.0 to 11
Nitrogen (N), % 0.15 to 0.21
0.030 to 0.12
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 1.0
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0