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R30605 Cobalt vs. S66286 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while S66286 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 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is S66286 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
17 to 40
Fatigue Strength, MPa 260 to 590
240 to 410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
620 to 1020
Tensile Strength: Yield (Proof), MPa 470 to 1600
280 to 670

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.2

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
6.0
Embodied Energy, MJ/kg 140
87
Embodied Water, L/kg 450
170

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
22 to 36
Strength to Weight: Bending, points 25 to 36
20 to 28
Thermal Diffusivity, mm2/s 2.5
4.0
Thermal Shock Resistance, points 31 to 52
13 to 22

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.050 to 0.15
0 to 0.080
Chromium (Cr), % 19 to 21
13.5 to 16
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
49.1 to 59.5
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
1.0 to 1.5
Nickel (Ni), % 9.0 to 11
24 to 27
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
1.9 to 2.4
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.1 to 0.5

Comparable Variants