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R31539 Cobalt vs. AISI 309 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 309 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 (9, in this case) are not shown.

For each property being compared, the top bar is R31539 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, % 13 to 22
34 to 47
Fatigue Strength, MPa 310 to 480
250 to 280
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
600 to 710
Tensile Strength: Yield (Proof), MPa 590 to 940
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.6
Embodied Energy, MJ/kg 110
51
Embodied Water, L/kg 530
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
170 to 310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
21 to 25
Strength to Weight: Bending, points 27 to 32
20 to 23
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 24 to 32
14 to 16

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.2
Chromium (Cr), % 26 to 30
22 to 24
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
58 to 66
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
12 to 15
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030

Comparable Variants