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EN 2.4964 Cobalt vs. EN 1.4911 Stainless Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while EN 1.4911 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 1.4911 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 40
11
Fatigue Strength, MPa 220
530
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 960
1070
Tensile Strength: Yield (Proof), MPa 390
970

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1630
1450
Melting Onset (Solidus), °C 1550
1410
Specific Heat Capacity, J/kg-K 400
470
Thermal Conductivity, W/m-K 15
20
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
3.4
Embodied Energy, MJ/kg 140
49
Embodied Water, L/kg 450
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
120
Resilience: Unit (Modulus of Resilience), kJ/m3 340
2410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 28
38
Strength to Weight: Bending, points 23
30
Thermal Diffusivity, mm2/s 3.9
5.4
Thermal Shock Resistance, points 25
37

Alloy Composition

Boron (B), % 0
0.0050 to 0.015
Carbon (C), % 0.050 to 0.15
0.050 to 0.12
Chromium (Cr), % 19 to 21
9.8 to 11.2
Cobalt (Co), % 46.4 to 58
5.0 to 7.0
Iron (Fe), % 0 to 3.0
75.7 to 83.8
Manganese (Mn), % 0 to 2.0
0.3 to 1.3
Molybdenum (Mo), % 0
0.5 to 1.0
Nickel (Ni), % 9.0 to 11
0.2 to 1.2
Niobium (Nb), % 0
0.2 to 0.5
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.4
0.1 to 0.8
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 14 to 16
0 to 0.7
Vanadium (V), % 0
0.1 to 0.4