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AWS E308 vs. R31538 Cobalt

AWS E308 belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 AWS E308 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 40
13 to 23
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 620
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.2
8.1
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 150
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
34 to 45
Strength to Weight: Bending, points 21
27 to 32
Thermal Diffusivity, mm2/s 4.2
3.5
Thermal Shock Resistance, points 16
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.35
Chromium (Cr), % 18 to 21
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 62.9 to 72.5
0 to 0.75
Manganese (Mn), % 0.5 to 2.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
5.0 to 7.0
Nickel (Ni), % 9.0 to 11
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0