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R31233 Cobalt vs. S15500 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while S15500 stainless steel belongs to the iron alloys. They have a modest 23% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
6.8 to 16
Fatigue Strength, MPa 220
350 to 650
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 1020
890 to 1490
Tensile Strength: Yield (Proof), MPa 420
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 480
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 410
890 to 4460
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
32 to 53
Strength to Weight: Bending, points 26
26 to 37
Thermal Diffusivity, mm2/s 3.2
4.6
Thermal Shock Resistance, points 25
30 to 50

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.070
Chromium (Cr), % 23.5 to 27.5
14 to 15.5
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 1.0 to 5.0
71.9 to 79.9
Manganese (Mn), % 0.1 to 1.5
0 to 1.0
Molybdenum (Mo), % 4.0 to 6.0
0
Nickel (Ni), % 7.0 to 11
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Nitrogen (N), % 0.030 to 0.12
0
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
Tungsten (W), % 1.0 to 3.0
0