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EN 2.4964 Cobalt vs. SAE-AISI 4340M Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 40
6.0
Fatigue Strength, MPa 220
690
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 960
2340
Tensile Strength: Yield (Proof), MPa 390
1240

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1630
1440
Melting Onset (Solidus), °C 1550
1400
Specific Heat Capacity, J/kg-K 400
480
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.1

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
1.9
Embodied Energy, MJ/kg 140
26
Embodied Water, L/kg 450
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
120
Resilience: Unit (Modulus of Resilience), kJ/m3 340
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 28
84
Strength to Weight: Bending, points 23
51
Thermal Diffusivity, mm2/s 3.9
10
Thermal Shock Resistance, points 25
70

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.38 to 0.43
Chromium (Cr), % 19 to 21
0.7 to 1.0
Cobalt (Co), % 46.4 to 58
0
Iron (Fe), % 0 to 3.0
93.3 to 94.8
Manganese (Mn), % 0 to 2.0
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 9.0 to 11
1.7 to 2.0
Phosphorus (P), % 0 to 0.020
0 to 0.012
Silicon (Si), % 0 to 0.4
1.5 to 1.8
Sulfur (S), % 0 to 0.015
0 to 0.012
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.050 to 0.1