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EN 2.4964 Cobalt vs. SAE-AISI 4340 Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4340 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 2.4964 cobalt and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 40
12 to 22
Fatigue Strength, MPa 220
330 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 960
690 to 1280
Tensile Strength: Yield (Proof), MPa 390
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1630
1460
Melting Onset (Solidus), °C 1550
1420
Specific Heat Capacity, J/kg-K 400
470
Thermal Conductivity, W/m-K 15
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.6

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
1.7
Embodied Energy, MJ/kg 140
22
Embodied Water, L/kg 450
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 340
590 to 3490
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 28
24 to 45
Strength to Weight: Bending, points 23
22 to 33
Thermal Diffusivity, mm2/s 3.9
12
Thermal Shock Resistance, points 25
20 to 38

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.7 to 0.9
Cobalt (Co), % 46.4 to 58
0
Iron (Fe), % 0 to 3.0
95.1 to 96.3
Manganese (Mn), % 0 to 2.0
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 9.0 to 11
1.7 to 2.0
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Tungsten (W), % 14 to 16
0