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R30816 Cobalt vs. S32050 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while S32050 stainless steel belongs to the iron alloys. They have 48% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is S32050 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
220
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 23
46
Fatigue Strength, MPa 250
340
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 1020
770
Tensile Strength: Yield (Proof), MPa 460
370

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.0
Embodied Carbon, kg CO2/kg material 20
6.0
Embodied Energy, MJ/kg 320
81
Embodied Water, L/kg 440
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
290
Resilience: Unit (Modulus of Resilience), kJ/m3 510
330
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
27
Strength to Weight: Bending, points 25
23
Thermal Diffusivity, mm2/s 3.3
3.3
Thermal Shock Resistance, points 28
17

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
22 to 24
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.4
Iron (Fe), % 0 to 5.0
43.1 to 51.8
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 3.5 to 4.5
6.0 to 6.6
Nickel (Ni), % 19 to 21
20 to 23
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0.21 to 0.32
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0