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R31233 Cobalt vs. S35125 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S35125 stainless steel belongs to the iron alloys. They have a modest 37% 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 (5, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is S35125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
39
Fatigue Strength, MPa 220
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 1020
540
Tensile Strength: Yield (Proof), MPa 420
230

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.1
Embodied Carbon, kg CO2/kg material 8.4
6.4
Embodied Energy, MJ/kg 110
89
Embodied Water, L/kg 480
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 410
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
19
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.2
3.1
Thermal Shock Resistance, points 25
12

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.1
Chromium (Cr), % 23.5 to 27.5
20 to 23
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
36.2 to 45.8
Manganese (Mn), % 0.1 to 1.5
1.0 to 1.5
Molybdenum (Mo), % 4.0 to 6.0
2.0 to 3.0
Nickel (Ni), % 7.0 to 11
31 to 35
Niobium (Nb), % 0
0.25 to 0.6
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.050 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.015
Tungsten (W), % 1.0 to 3.0
0