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R31539 Cobalt vs. AISI 446 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 446 stainless steel belongs to the iron alloys. They have a modest 27% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is AISI 446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
23
Fatigue Strength, MPa 310 to 480
200
Poisson's Ratio 0.29
0.27
Reduction in Area, % 13 to 23
50
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
570
Tensile Strength: Yield (Proof), MPa 590 to 940
300

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1510
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.9
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
2.4
Embodied Energy, MJ/kg 110
35
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
110
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
230
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 33 to 44
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Diffusivity, mm2/s 3.5
4.6
Thermal Shock Resistance, points 24 to 32
19

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
23 to 27
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
69.2 to 77
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.75
Nitrogen (N), % 0 to 0.25
0 to 0.25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030