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R31539 Cobalt vs. EN 1.5538 Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.5538 steel belongs to the iron alloys. There are 23 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 R31539 cobalt and the bottom bar is EN 1.5538 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
64 to 69
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
530 to 1810

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
51
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
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 530
48

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
19 to 64
Strength to Weight: Bending, points 27 to 32
19 to 42
Thermal Diffusivity, mm2/s 3.5
14
Thermal Shock Resistance, points 24 to 32
16 to 53

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Boron (B), % 0
0.00080 to 0.0050
Carbon (C), % 0 to 0.14
0.35 to 0.4
Chromium (Cr), % 26 to 30
0 to 0.3
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
97.2 to 98.5
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
1.2 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0
0 to 0.025