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R30012 Cobalt vs. N08367 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while N08367 stainless steel belongs to the iron alloys. They have a modest 25% 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 (10, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is N08367 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
34
Fatigue Strength, MPa 320
280
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 830
740
Tensile Strength: Yield (Proof), MPa 650
350

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1410
Specific Heat Capacity, J/kg-K 440
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 12
15

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.1
Embodied Carbon, kg CO2/kg material 8.3
6.2
Embodied Energy, MJ/kg 120
84
Embodied Water, L/kg 480
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
210
Resilience: Unit (Modulus of Resilience), kJ/m3 960
290
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
25
Strength to Weight: Bending, points 22
22
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 23
17

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.030
Chromium (Cr), % 27 to 32
20 to 22
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 3.0
41.4 to 50.3
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
6.0 to 7.0
Nickel (Ni), % 0 to 3.0
23.5 to 25.5
Nitrogen (N), % 0
0.18 to 0.25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0