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S31266 Stainless Steel vs. R30001 Cobalt

S31266 stainless steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is S31266 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 40
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 860
620

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1470
1530
Melting Onset (Solidus), °C 1420
1260
Specific Heat Capacity, J/kg-K 460
430
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.2
9.0
Embodied Carbon, kg CO2/kg material 6.5
8.9
Embodied Energy, MJ/kg 89
130
Embodied Water, L/kg 220
460

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 29
19
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 3.1
3.7
Thermal Shock Resistance, points 18
19

Alloy Composition

Carbon (C), % 0 to 0.030
2.0 to 3.0
Chromium (Cr), % 23 to 25
28 to 32
Cobalt (Co), % 0
43 to 59
Copper (Cu), % 1.0 to 2.5
0
Iron (Fe), % 34.1 to 46
0 to 3.0
Manganese (Mn), % 2.0 to 4.0
0
Molybdenum (Mo), % 5.2 to 6.2
0 to 1.0
Nickel (Ni), % 21 to 24
0 to 3.0
Nitrogen (N), % 0.35 to 0.6
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.020
0
Tungsten (W), % 1.5 to 2.5
11 to 13