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R31538 Cobalt vs. SAE-AISI A3 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI A3 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is SAE-AISI A3 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
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
700 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
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
37
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.4
Embodied Energy, MJ/kg 110
67
Embodied Water, L/kg 530
78

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
25 to 77
Strength to Weight: Bending, points 27 to 32
23 to 48
Thermal Diffusivity, mm2/s 3.5
10
Thermal Shock Resistance, points 25 to 33
23 to 70

Alloy Composition

Carbon (C), % 0.15 to 0.35
1.2 to 1.3
Chromium (Cr), % 26 to 30
4.8 to 5.5
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
88.7 to 92
Manganese (Mn), % 0 to 1.0
0.4 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.4
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
0.8 to 1.4

Comparable Variants