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EN 2.4964 Cobalt vs. S44800 Stainless Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while S44800 stainless steel belongs to the iron alloys. They have a modest 24% 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 (8, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 cobalt and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 40
23
Fatigue Strength, MPa 220
300
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
82
Tensile Strength: Ultimate (UTS), MPa 960
590
Tensile Strength: Yield (Proof), MPa 390
450

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1630
1460
Melting Onset (Solidus), °C 1550
1410
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
3.8
Embodied Energy, MJ/kg 140
52
Embodied Water, L/kg 450
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
120
Resilience: Unit (Modulus of Resilience), kJ/m3 340
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 23
20
Thermal Diffusivity, mm2/s 3.9
4.6
Thermal Shock Resistance, points 25
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.010
Chromium (Cr), % 19 to 21
28 to 30
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 0 to 3.0
62.6 to 66.5
Manganese (Mn), % 0 to 2.0
0 to 0.3
Molybdenum (Mo), % 0
3.5 to 4.2
Nickel (Ni), % 9.0 to 11
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.2
Sulfur (S), % 0 to 0.015
0 to 0.020
Tungsten (W), % 14 to 16
0