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EN 2.4964 Cobalt vs. EN 1.4634 Stainless Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while EN 1.4634 stainless steel belongs to the iron alloys. They have a modest 20% 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 (5, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 cobalt and the bottom bar is EN 1.4634 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 40
21
Fatigue Strength, MPa 220
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 960
540
Tensile Strength: Yield (Proof), MPa 390
280

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1630
1430
Melting Onset (Solidus), °C 1550
1390
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.7
Embodied Carbon, kg CO2/kg material 9.8
2.9
Embodied Energy, MJ/kg 140
42
Embodied Water, L/kg 450
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
93
Resilience: Unit (Modulus of Resilience), kJ/m3 340
200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 28
20
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 3.9
5.8
Thermal Shock Resistance, points 25
19

Alloy Composition

Aluminum (Al), % 0
0.2 to 1.5
Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 19 to 21
17.5 to 18.5
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 0 to 3.0
74.9 to 81.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 9.0 to 11
0 to 0.5
Niobium (Nb), % 0
0.3 to 1.0
Phosphorus (P), % 0 to 0.020
0 to 0.050
Silicon (Si), % 0 to 0.4
0.2 to 1.5
Sulfur (S), % 0 to 0.015
0 to 0.050
Tungsten (W), % 14 to 16
0