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R30001 Cobalt vs. S32654 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while S32654 stainless steel belongs to the iron alloys. They have a modest 28% 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 (13, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is S32654 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
45
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
82
Tensile Strength: Ultimate (UTS), MPa 620
850

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1530
1450
Melting Onset (Solidus), °C 1260
1410
Specific Heat Capacity, J/kg-K 430
460
Thermal Conductivity, W/m-K 15
11
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.5

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.0
Embodied Carbon, kg CO2/kg material 8.9
6.4
Embodied Energy, MJ/kg 130
87
Embodied Water, L/kg 460
220

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
29
Strength to Weight: Bending, points 18
25
Thermal Diffusivity, mm2/s 3.7
2.9
Thermal Shock Resistance, points 19
19

Alloy Composition

Carbon (C), % 2.0 to 3.0
0 to 0.020
Chromium (Cr), % 28 to 32
24 to 25
Cobalt (Co), % 43 to 59
0
Copper (Cu), % 0
0.3 to 0.6
Iron (Fe), % 0 to 3.0
38.3 to 45.3
Manganese (Mn), % 0
2.0 to 4.0
Molybdenum (Mo), % 0 to 1.0
7.0 to 8.0
Nickel (Ni), % 0 to 3.0
21 to 23
Nitrogen (N), % 0
0.45 to 0.55
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.0050
Tungsten (W), % 11 to 13
0