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R31538 Cobalt vs. SAE-AISI 4320 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4320 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 R31538 cobalt and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
21 to 29
Fatigue Strength, MPa 310 to 480
320
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
570 to 790
Tensile Strength: Yield (Proof), MPa 580 to 930
430 to 460

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.7
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 530
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
480 to 560
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
20 to 28
Strength to Weight: Bending, points 27 to 32
19 to 24
Thermal Diffusivity, mm2/s 3.5
13
Thermal Shock Resistance, points 25 to 33
19 to 27

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.17 to 0.22
Chromium (Cr), % 26 to 30
0.4 to 0.6
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
95.8 to 97
Manganese (Mn), % 0 to 1.0
0.45 to 0.65
Molybdenum (Mo), % 5.0 to 7.0
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
1.7 to 2.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040

Comparable Variants