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R31539 Cobalt vs. AISI 314 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 314 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 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is AISI 314 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
45
Fatigue Strength, MPa 310 to 480
210
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
57
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
590
Tensile Strength: Yield (Proof), MPa 590 to 940
230

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1340
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
4.3
Embodied Energy, MJ/kg 110
62
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
210
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Diffusivity, mm2/s 3.5
3.9
Thermal Shock Resistance, points 24 to 32
14

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.25
Chromium (Cr), % 26 to 30
23 to 26
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
46.7 to 56.5
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
19 to 22
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.0
1.5 to 3.0
Sulfur (S), % 0
0 to 0.030