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S31266 Stainless Steel vs. R31538 Cobalt

S31266 stainless steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have a modest 32% 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 S31266 stainless steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 40
13 to 23
Fatigue Strength, MPa 400
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 56
13 to 22
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 860
1020 to 1360
Tensile Strength: Yield (Proof), MPa 470
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 460
450
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 6.5
8.1
Embodied Energy, MJ/kg 89
110
Embodied Water, L/kg 220
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 290
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 540
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
34 to 45
Strength to Weight: Bending, points 24
27 to 32
Thermal Diffusivity, mm2/s 3.1
3.5
Thermal Shock Resistance, points 18
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.030
0.15 to 0.35
Chromium (Cr), % 23 to 25
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 1.0 to 2.5
0
Iron (Fe), % 34.1 to 46
0 to 0.75
Manganese (Mn), % 2.0 to 4.0
0 to 1.0
Molybdenum (Mo), % 5.2 to 6.2
5.0 to 7.0
Nickel (Ni), % 21 to 24
0 to 1.0
Nitrogen (N), % 0.35 to 0.6
0 to 0.25
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0
Tungsten (W), % 1.5 to 2.5
0