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R30816 Cobalt vs. S33425 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while S33425 stainless steel belongs to the iron alloys. They have 46% 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 S33425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
170
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
45
Fatigue Strength, MPa 250
210
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
79
Tensile Strength: Ultimate (UTS), MPa 1020
580
Tensile Strength: Yield (Proof), MPa 460
230

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1430
Melting Onset (Solidus), °C 1460
1380
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 20
5.1
Embodied Energy, MJ/kg 320
71
Embodied Water, L/kg 440
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
210
Resilience: Unit (Modulus of Resilience), kJ/m3 510
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
20
Strength to Weight: Bending, points 25
19
Thermal Diffusivity, mm2/s 3.3
3.7
Thermal Shock Resistance, points 28
13

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.6
Carbon (C), % 0.32 to 0.42
0 to 0.080
Chromium (Cr), % 19 to 21
21 to 23
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
47.2 to 56.7
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 3.5 to 4.5
2.0 to 3.0
Nickel (Ni), % 19 to 21
20 to 23
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
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
Titanium (Ti), % 0
0.15 to 0.6
Tungsten (W), % 3.5 to 4.5
0