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R31539 Cobalt vs. S35500 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S35500 stainless steel belongs to the iron alloys. They have a modest 20% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is S35500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
14
Fatigue Strength, MPa 310 to 480
690 to 730
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
33 to 42
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1330 to 1490
Tensile Strength: Yield (Proof), MPa 590 to 940
1200 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
16
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 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.5
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
3610 to 4100
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
47 to 53
Strength to Weight: Bending, points 27 to 32
34 to 37
Thermal Diffusivity, mm2/s 3.5
4.4
Thermal Shock Resistance, points 24 to 32
44 to 49

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.1 to 0.15
Chromium (Cr), % 26 to 30
15 to 16
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
73.2 to 77.7
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.5 to 1.3
Molybdenum (Mo), % 5.0 to 7.0
2.5 to 3.2
Nickel (Ni), % 0 to 1.0
4.0 to 5.0
Niobium (Nb), % 0
0.1 to 0.5
Nitrogen (N), % 0 to 0.25
0.070 to 0.13
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030

Comparable Variants