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R31539 Cobalt vs. S32950 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S32950 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is S32950 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
17
Fatigue Strength, MPa 310 to 480
330
Poisson's Ratio 0.29
0.27
Rockwell C Hardness 25 to 35
28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
780
Tensile Strength: Yield (Proof), MPa 590 to 940
550

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1390
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.4
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
120
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
730
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
28
Strength to Weight: Bending, points 27 to 32
24
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 24 to 32
21

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
26 to 29
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
60.3 to 69.4
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
1.0 to 2.5
Nickel (Ni), % 0 to 1.0
3.5 to 5.2
Nitrogen (N), % 0 to 0.25
0.15 to 0.35
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0
0 to 0.010