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R30021 Cobalt vs. AISI 310S Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while AISI 310S stainless steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30021 cobalt and the bottom bar is AISI 310S stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
34 to 44
Fatigue Strength, MPa 250
250 to 280
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 700
600 to 710
Tensile Strength: Yield (Proof), MPa 500
270 to 350

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
4.3
Embodied Energy, MJ/kg 110
61
Embodied Water, L/kg 520
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
200 to 220
Resilience: Unit (Modulus of Resilience), kJ/m3 570
190 to 310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
21 to 25
Strength to Weight: Bending, points 21
20 to 22
Thermal Diffusivity, mm2/s 3.8
4.1
Thermal Shock Resistance, points 21
14 to 16

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 29
24 to 26
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
48.3 to 57
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
19 to 22
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.5
Sulfur (S), % 0
0 to 0.030