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EN 2.4964 Cobalt vs. S31100 Stainless Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while S31100 stainless steel belongs to the iron alloys. They have a modest 29% 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 (7, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 cobalt and the bottom bar is S31100 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 40
4.5
Fatigue Strength, MPa 220
330
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 960
1000
Tensile Strength: Yield (Proof), MPa 390
710

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1630
1420
Melting Onset (Solidus), °C 1550
1380
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.4

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.7
Embodied Carbon, kg CO2/kg material 9.8
3.1
Embodied Energy, MJ/kg 140
44
Embodied Water, L/kg 450
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
40
Resilience: Unit (Modulus of Resilience), kJ/m3 340
1240
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 28
36
Strength to Weight: Bending, points 23
29
Thermal Diffusivity, mm2/s 3.9
4.2
Thermal Shock Resistance, points 25
28

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.060
Chromium (Cr), % 19 to 21
25 to 27
Cobalt (Co), % 46.4 to 58
0
Iron (Fe), % 0 to 3.0
63.6 to 69
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 9.0 to 11
6.0 to 7.0
Phosphorus (P), % 0 to 0.020
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0
0 to 0.25
Tungsten (W), % 14 to 16
0