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R30012 Cobalt vs. AISI 309HCb Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while AISI 309HCb 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 309HCb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
46
Fatigue Strength, MPa 320
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 830
590
Tensile Strength: Yield (Proof), MPa 650
230

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1280
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 12
16

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
4.1
Embodied Energy, MJ/kg 120
59
Embodied Water, L/kg 480
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
210
Resilience: Unit (Modulus of Resilience), kJ/m3 960
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 23
13

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.040 to 0.1
Chromium (Cr), % 27 to 32
22 to 24
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
56 to 66
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
12 to 16
Niobium (Nb), % 0
0 to 1.1
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