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R30816 Cobalt vs. S32615 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while S32615 stainless steel belongs to the iron alloys. They have 43% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is S32615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
170
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
28
Fatigue Strength, MPa 250
180
Poisson's Ratio 0.3
0.28
Reduction in Area, % 22
46
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1020
620
Tensile Strength: Yield (Proof), MPa 460
250

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Melting Completion (Liquidus), °C 1540
1350
Melting Onset (Solidus), °C 1460
1310
Specific Heat Capacity, J/kg-K 420
500
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.6
Embodied Carbon, kg CO2/kg material 20
4.4
Embodied Energy, MJ/kg 320
63
Embodied Water, L/kg 440
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
140
Resilience: Unit (Modulus of Resilience), kJ/m3 510
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
23
Strength to Weight: Bending, points 25
21
Thermal Shock Resistance, points 28
15

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.070
Chromium (Cr), % 19 to 21
16.5 to 19.5
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 5.0
46.4 to 57.9
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
0.3 to 1.5
Nickel (Ni), % 19 to 21
19 to 22
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
4.8 to 6.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0