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R30816 Cobalt vs. S31730 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while S31730 stainless steel belongs to the iron alloys. They have 41% of their average alloy composition in common. There are 24 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 R30816 cobalt and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
180
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
40
Fatigue Strength, MPa 250
170
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 1020
540
Tensile Strength: Yield (Proof), MPa 460
200

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Melting Completion (Liquidus), °C 1540
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 420
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.0
Embodied Carbon, kg CO2/kg material 20
4.6
Embodied Energy, MJ/kg 320
63
Embodied Water, L/kg 440
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
170
Resilience: Unit (Modulus of Resilience), kJ/m3 510
99
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 31
19
Strength to Weight: Bending, points 25
18
Thermal Shock Resistance, points 28
12

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
17 to 19
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 0 to 5.0
52.4 to 61
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
3.0 to 4.0
Nickel (Ni), % 19 to 21
15 to 16.5
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.045
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 0.010
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0