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R31538 Cobalt vs. AWS E80C-B2

R31538 cobalt belongs to the cobalt alloys classification, while AWS E80C-B2 belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS E80C-B2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
630
Tensile Strength: Yield (Proof), MPa 580 to 930
530

Thermal Properties

Latent Heat of Fusion, J/g 320
260
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.5
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
1.6
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 530
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
130
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
740
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
22
Strength to Weight: Bending, points 27 to 32
21
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 25 to 33
18

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0.050 to 0.12
Chromium (Cr), % 26 to 30
1.0 to 1.5
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
95.3 to 97.9
Manganese (Mn), % 0 to 1.0
0.4 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0.4 to 0.65
Nickel (Ni), % 0 to 1.0
0 to 0.2
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0.25 to 0.6
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 0.030
Residuals, % 0
0 to 0.5