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R31537 Cobalt vs. S20910 Stainless Steel

R31537 cobalt belongs to the cobalt alloys classification, while S20910 stainless steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 R31537 cobalt and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 14 to 23
14 to 39
Fatigue Strength, MPa 310 to 480
310 to 460
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
56 to 62
Shear Modulus, GPa 87
79
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
780 to 940
Tensile Strength: Yield (Proof), MPa 590 to 940
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
120 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
460 to 1640
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
28 to 33
Strength to Weight: Bending, points 26 to 32
24 to 27
Thermal Diffusivity, mm2/s 3.4
3.6
Thermal Shock Resistance, points 24 to 32
17 to 21

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.060
Chromium (Cr), % 26 to 30
20.5 to 23.5
Cobalt (Co), % 58.9 to 69
0
Iron (Fe), % 0 to 0.75
52.1 to 62.1
Manganese (Mn), % 0 to 1.0
4.0 to 6.0
Molybdenum (Mo), % 5.0 to 7.0
1.5 to 3.0
Nickel (Ni), % 0 to 1.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0 to 0.25
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3

Comparable Variants