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EN 2.4964 Cobalt vs. SAE-AISI 8740 Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while SAE-AISI 8740 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 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 40
11 to 23
Fatigue Strength, MPa 220
270 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 960
580 to 670
Tensile Strength: Yield (Proof), MPa 390
380 to 570

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
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.4

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 450
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 340
390 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 28
20 to 24
Strength to Weight: Bending, points 23
20 to 22
Thermal Diffusivity, mm2/s 3.9
10
Thermal Shock Resistance, points 25
17 to 20

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.4 to 0.6
Cobalt (Co), % 46.4 to 58
0
Iron (Fe), % 0 to 3.0
96.5 to 97.7
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 9.0 to 11
0.4 to 0.7
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