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R31539 Cobalt vs. EN 1.4547 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4547 stainless steel belongs to the iron alloys. They have a modest 28% 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 EN 1.4547 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
39
Fatigue Strength, MPa 310 to 480
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
750
Tensile Strength: Yield (Proof), MPa 590 to 940
340

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 13
17

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
8.0
Embodied Carbon, kg CO2/kg material 8.2
5.6
Embodied Energy, MJ/kg 110
75
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
240
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
290
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
26
Strength to Weight: Bending, points 27 to 32
23
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 24 to 32
16

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.020
Chromium (Cr), % 26 to 30
19.5 to 20.5
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 0.75
51 to 56.3
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
6.0 to 7.0
Nickel (Ni), % 0 to 1.0
17.5 to 18.5
Nitrogen (N), % 0 to 0.25
0.18 to 0.25
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0
0 to 0.010