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S31266 Stainless Steel vs. EN 2.4964 Cobalt

S31266 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt 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 S31266 stainless steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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