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R30012 Cobalt vs. SAE-AISI 4140 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4140 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
11 to 26
Fatigue Strength, MPa 320
360 to 650
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 830
690 to 1080
Tensile Strength: Yield (Proof), MPa 650
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
43
Thermal Expansion, µm/m-K 12
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 120
20
Embodied Water, L/kg 480
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 960
920 to 2590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
25 to 38
Strength to Weight: Bending, points 22
22 to 30
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 23
20 to 32

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.38 to 0.43
Chromium (Cr), % 27 to 32
0.8 to 1.1
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
96.8 to 97.8
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.15 to 0.25
Nickel (Ni), % 0 to 3.0
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), % 7.5 to 9.5
0