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N08366 Stainless Steel vs. R31537 Cobalt

N08366 stainless steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 29% 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 N08366 stainless steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 34
14 to 23
Fatigue Strength, MPa 190
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
87
Tensile Strength: Ultimate (UTS), MPa 590
1000 to 1340
Tensile Strength: Yield (Proof), MPa 240
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 460
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 6.2
8.1
Embodied Energy, MJ/kg 84
110
Embodied Water, L/kg 200
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 150
780 to 1990
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
33 to 44
Strength to Weight: Bending, points 19
26 to 32
Thermal Diffusivity, mm2/s 3.4
3.4
Thermal Shock Resistance, points 13
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.14
Chromium (Cr), % 20 to 22
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 42.4 to 50.5
0 to 0.75
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 6.0 to 7.0
5.0 to 7.0
Nickel (Ni), % 23.5 to 25.5
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0