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S33228 Stainless Steel vs. R30816 Cobalt

S33228 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have 44% of their average alloy composition in common. There are 25 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 S33228 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 34
23
Fatigue Strength, MPa 170
250
Poisson's Ratio 0.28
0.3
Reduction in Area, % 39
22
Shear Modulus, GPa 79
81
Tensile Strength: Ultimate (UTS), MPa 570
1020
Tensile Strength: Yield (Proof), MPa 210
460

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Melting Completion (Liquidus), °C 1410
1540
Melting Onset (Solidus), °C 1360
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 8.0
9.1
Embodied Carbon, kg CO2/kg material 6.2
20
Embodied Energy, MJ/kg 89
320
Embodied Water, L/kg 220
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
190
Resilience: Unit (Modulus of Resilience), kJ/m3 110
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 20
31
Strength to Weight: Bending, points 19
25
Thermal Shock Resistance, points 13
28

Alloy Composition

Aluminum (Al), % 0 to 0.025
0
Carbon (C), % 0.040 to 0.080
0.32 to 0.42
Cerium (Ce), % 0.050 to 0.1
0
Chromium (Cr), % 26 to 28
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 36.5 to 42.3
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 31 to 33
19 to 21
Niobium (Nb), % 0.6 to 1.0
3.5 to 4.5
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5