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R30006 Cobalt vs. SAE-AISI 4340 Steel

R30006 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 (7, in this case) are not shown.

For each property being compared, the top bar is R30006 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, % 1.0
12 to 22
Fatigue Strength, MPa 260
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 900
690 to 1280
Tensile Strength: Yield (Proof), MPa 540
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
1.7
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 500
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 670
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
24 to 45
Strength to Weight: Bending, points 24
22 to 33
Thermal Diffusivity, mm2/s 3.9
12
Thermal Shock Resistance, points 26
20 to 38

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.38 to 0.43
Chromium (Cr), % 27 to 32
0.7 to 0.9
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
95.1 to 96.3
Manganese (Mn), % 0
0.6 to 0.8
Molybdenum (Mo), % 0 to 1.0
0.2 to 0.3
Nickel (Ni), % 0 to 3.0
1.7 to 2.0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 4.0 to 6.0
0