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R30001 Cobalt vs. S39274 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while S39274 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 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 R30001 cobalt and the bottom bar is S39274 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
17
Poisson's Ratio 0.28
0.27
Rockwell C Hardness 55
28
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 620
900

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Melting Completion (Liquidus), °C 1530
1480
Melting Onset (Solidus), °C 1260
1430
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.4

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.0
Embodied Carbon, kg CO2/kg material 8.9
4.3
Embodied Energy, MJ/kg 130
60
Embodied Water, L/kg 460
180

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
32
Strength to Weight: Bending, points 18
26
Thermal Diffusivity, mm2/s 3.7
4.2
Thermal Shock Resistance, points 19
25

Alloy Composition

Carbon (C), % 2.0 to 3.0
0 to 0.030
Chromium (Cr), % 28 to 32
24 to 26
Cobalt (Co), % 43 to 59
0
Copper (Cu), % 0
0.2 to 0.8
Iron (Fe), % 0 to 3.0
57 to 65.6
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
2.5 to 3.5
Nickel (Ni), % 0 to 3.0
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 11 to 13
1.5 to 2.5