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EN 2.4964 Cobalt vs. SAE-AISI A8 Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while SAE-AISI A8 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (7, 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 A8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 960
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1630
1480
Melting Onset (Solidus), °C 1550
1430
Specific Heat Capacity, J/kg-K 400
470
Thermal Conductivity, W/m-K 15
37
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.5

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
2.3
Embodied Energy, MJ/kg 140
31
Embodied Water, L/kg 450
73

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 28
25 to 68
Strength to Weight: Bending, points 23
22 to 44
Thermal Diffusivity, mm2/s 3.9
9.9
Thermal Shock Resistance, points 25
22 to 62

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.5 to 0.6
Chromium (Cr), % 19 to 21
4.8 to 5.5
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
88.5 to 91.9
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0
1.2 to 1.7
Nickel (Ni), % 9.0 to 11
0 to 0.3
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 0.4
0.75 to 1.1
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 14 to 16
1.0 to 1.5