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R31537 Cobalt vs. SAE-AISI O2 Steel

R31537 cobalt belongs to the cobalt alloys classification, while SAE-AISI O2 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 R31537 cobalt and the bottom bar is SAE-AISI O2 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 87
72
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
640 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
43
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
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.8
Embodied Energy, MJ/kg 110
26
Embodied Water, L/kg 530
50

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
23 to 73
Strength to Weight: Bending, points 26 to 32
21 to 46
Thermal Diffusivity, mm2/s 3.4
12
Thermal Shock Resistance, points 24 to 32
22 to 70

Alloy Composition

Carbon (C), % 0 to 0.14
0.85 to 1.0
Chromium (Cr), % 26 to 30
0 to 0.5
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
95 to 97.8
Manganese (Mn), % 0 to 1.0
1.4 to 1.8
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.3
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
Vanadium (V), % 0
0 to 0.3

Comparable Variants