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R30012 Cobalt vs. AISI 309 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while AISI 309 stainless steel belongs to the iron alloys. They have a modest 26% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
34 to 47
Fatigue Strength, MPa 320
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 830
600 to 710
Tensile Strength: Yield (Proof), MPa 650
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1280
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.6
Embodied Energy, MJ/kg 120
51
Embodied Water, L/kg 480
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 960
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
21 to 25
Strength to Weight: Bending, points 22
20 to 23
Thermal Diffusivity, mm2/s 3.8
4.3
Thermal Shock Resistance, points 23
14 to 16

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.2
Chromium (Cr), % 27 to 32
22 to 24
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
58 to 66
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
12 to 15
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0