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AISI 310S Stainless Steel vs. R30012 Cobalt

AISI 310S stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 29% 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 AISI 310S stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34 to 44
1.0
Fatigue Strength, MPa 250 to 280
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
86
Tensile Strength: Ultimate (UTS), MPa 600 to 710
830
Tensile Strength: Yield (Proof), MPa 270 to 350
650

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.8
Embodied Carbon, kg CO2/kg material 4.3
8.3
Embodied Energy, MJ/kg 61
120
Embodied Water, L/kg 190
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 220
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 190 to 310
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21 to 25
26
Strength to Weight: Bending, points 20 to 22
22
Thermal Diffusivity, mm2/s 4.1
3.8
Thermal Shock Resistance, points 14 to 16
23

Alloy Composition

Carbon (C), % 0 to 0.080
1.4 to 2.0
Chromium (Cr), % 24 to 26
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 48.3 to 57
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 19 to 22
0 to 3.0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5