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S35000 Stainless Steel vs. R31538 Cobalt

S35000 stainless steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt 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 S35000 stainless steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 2.3 to 14
13 to 23
Fatigue Strength, MPa 380 to 520
310 to 480
Poisson's Ratio 0.28
0.29
Rockwell C Hardness 26 to 37
25 to 35
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 1300 to 1570
1020 to 1360
Tensile Strength: Yield (Proof), MPa 660 to 1160
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.2
8.1
Embodied Energy, MJ/kg 44
110
Embodied Water, L/kg 130
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28 to 170
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 1070 to 3360
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 46 to 56
34 to 45
Strength to Weight: Bending, points 34 to 38
27 to 32
Thermal Diffusivity, mm2/s 4.4
3.5
Thermal Shock Resistance, points 42 to 51
25 to 33

Alloy Composition

Carbon (C), % 0.070 to 0.11
0.15 to 0.35
Chromium (Cr), % 16 to 17
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 72.7 to 76.9
0 to 0.75
Manganese (Mn), % 0.5 to 1.3
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.2
5.0 to 7.0
Nickel (Ni), % 4.0 to 5.0
0 to 1.0
Nitrogen (N), % 0.070 to 0.13
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0

Comparable Variants