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EN 2.4964 Cobalt vs. S31266 Stainless Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while S31266 stainless steel belongs to the iron alloys. They have a modest 35% 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 (6, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 cobalt and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 40
40
Fatigue Strength, MPa 220
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 960
860
Tensile Strength: Yield (Proof), MPa 390
470

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1630
1470
Melting Onset (Solidus), °C 1550
1420
Specific Heat Capacity, J/kg-K 400
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
8.2
Embodied Carbon, kg CO2/kg material 9.8
6.5
Embodied Energy, MJ/kg 140
89
Embodied Water, L/kg 450
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
290
Resilience: Unit (Modulus of Resilience), kJ/m3 340
540
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 28
29
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 3.9
3.1
Thermal Shock Resistance, points 25
18

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 19 to 21
23 to 25
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
1.0 to 2.5
Iron (Fe), % 0 to 3.0
34.1 to 46
Manganese (Mn), % 0 to 2.0
2.0 to 4.0
Molybdenum (Mo), % 0
5.2 to 6.2
Nickel (Ni), % 9.0 to 11
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.020
Tungsten (W), % 14 to 16
1.5 to 2.5