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AWS E383 vs. R31538 Cobalt

AWS E383 belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is AWS E383 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 34
13 to 23
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 580
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1370
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 6.4
8.1
Embodied Energy, MJ/kg 89
110
Embodied Water, L/kg 240
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
34 to 45
Strength to Weight: Bending, points 19
27 to 32
Thermal Diffusivity, mm2/s 3.1
3.5
Thermal Shock Resistance, points 15
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.030
0.15 to 0.35
Chromium (Cr), % 26.5 to 29
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0.6 to 1.5
0
Iron (Fe), % 28.8 to 39.2
0 to 0.75
Manganese (Mn), % 0.5 to 2.5
0 to 1.0
Molybdenum (Mo), % 3.2 to 4.2
5.0 to 7.0
Nickel (Ni), % 30 to 33
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 0.9
0 to 1.0
Sulfur (S), % 0 to 0.020
0