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R31233 Cobalt vs. S44735 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S44735 stainless steel belongs to the iron alloys. They have a modest 34% 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 S44735 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 17
21
Fatigue Strength, MPa 220
300
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 85
82
Tensile Strength: Ultimate (UTS), MPa 1020
630
Tensile Strength: Yield (Proof), MPa 420
460

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 8.4
4.4
Embodied Energy, MJ/kg 110
61
Embodied Water, L/kg 480
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 410
520
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 33
23
Strength to Weight: Bending, points 26
21
Thermal Shock Resistance, points 25
20

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.030
Chromium (Cr), % 23.5 to 27.5
28 to 30
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
60.7 to 68.4
Manganese (Mn), % 0.1 to 1.5
0 to 1.0
Molybdenum (Mo), % 4.0 to 6.0
3.6 to 4.2
Nickel (Ni), % 7.0 to 11
0 to 1.0
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0.030 to 0.12
0 to 0.045
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.0
Tungsten (W), % 1.0 to 3.0
0