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R31233 Cobalt vs. SAE-AISI 4118 Steel

R31233 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4118 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 R31233 cobalt and the bottom bar is SAE-AISI 4118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
23
Fatigue Strength, MPa 220
230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 1020
500
Tensile Strength: Yield (Proof), MPa 420
320

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.2

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 480
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
100
Resilience: Unit (Modulus of Resilience), kJ/m3 410
280
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33
18
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 25
15

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.18 to 0.23
Chromium (Cr), % 23.5 to 27.5
0.4 to 0.6
Cobalt (Co), % 44.7 to 63.3
0
Iron (Fe), % 1.0 to 5.0
97.5 to 98.4
Manganese (Mn), % 0.1 to 1.5
0.7 to 0.9
Molybdenum (Mo), % 4.0 to 6.0
0.2 to 0.3
Nickel (Ni), % 7.0 to 11
0
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.050 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Tungsten (W), % 1.0 to 3.0
0