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S66286 Stainless Steel vs. R30816 Cobalt

S66286 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have 40% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S66286 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 17 to 40
23
Fatigue Strength, MPa 240 to 410
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 620 to 1020
1020
Tensile Strength: Yield (Proof), MPa 280 to 670
460

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1430
1540
Melting Onset (Solidus), °C 1370
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.1
Embodied Carbon, kg CO2/kg material 6.0
20
Embodied Energy, MJ/kg 87
320
Embodied Water, L/kg 170
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 200
190
Resilience: Unit (Modulus of Resilience), kJ/m3 190 to 1150
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 22 to 36
31
Strength to Weight: Bending, points 20 to 28
25
Thermal Diffusivity, mm2/s 4.0
3.3
Thermal Shock Resistance, points 13 to 22
28

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Boron (B), % 0.0010 to 0.010
0
Carbon (C), % 0 to 0.080
0.32 to 0.42
Chromium (Cr), % 13.5 to 16
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 49.1 to 59.5
0 to 5.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 1.0 to 1.5
3.5 to 4.5
Nickel (Ni), % 24 to 27
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 1.9 to 2.4
0
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 0.1 to 0.5
0