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R31538 Cobalt vs. SAE-AISI O1 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI O1 steel belongs to the iron alloys. There are 22 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 R31538 cobalt and the bottom bar is SAE-AISI O1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
640 to 2060

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
43
Thermal Expansion, µm/m-K 13
12

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
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.9
Embodied Energy, MJ/kg 110
27
Embodied Water, L/kg 530
51

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
23 to 73
Strength to Weight: Bending, points 27 to 32
21 to 46
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 25 to 33
21 to 68

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.85 to 1.0
Chromium (Cr), % 26 to 30
0.4 to 0.6
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
95 to 97.4
Manganese (Mn), % 0 to 1.0
1.0 to 1.4
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.4 to 0.6
Vanadium (V), % 0
0 to 0.3

Comparable Variants