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S66286 Stainless Steel vs. R30605 Cobalt

S66286 stainless steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt 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 S66286 stainless steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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

Comparable Variants