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R31539 Cobalt vs. S35000 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S35000 stainless steel belongs to the iron alloys. They have a modest 21% 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 S35000 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
2.3 to 14
Fatigue Strength, MPa 310 to 480
380 to 520
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
26 to 37
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1300 to 1570
Tensile Strength: Yield (Proof), MPa 590 to 940
660 to 1160

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
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
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.2
Embodied Energy, MJ/kg 110
44
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
28 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
1070 to 3360
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
46 to 56
Strength to Weight: Bending, points 27 to 32
34 to 38
Thermal Diffusivity, mm2/s 3.5
4.4
Thermal Shock Resistance, points 24 to 32
42 to 51

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.070 to 0.11
Chromium (Cr), % 26 to 30
16 to 17
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
72.7 to 76.9
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
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