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R31539 Cobalt vs. AWS E33-31

R31539 cobalt belongs to the cobalt alloys classification, while AWS E33-31 belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is AWS E33-31.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 22
29
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
810

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.2
6.0
Embodied Energy, MJ/kg 110
86
Embodied Water, L/kg 530
260

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
28
Strength to Weight: Bending, points 27 to 32
24
Thermal Shock Resistance, points 24 to 32
19

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
31 to 35
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0.4 to 0.8
Iron (Fe), % 0 to 0.75
24.7 to 34.8
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
2.5 to 4.0
Molybdenum (Mo), % 5.0 to 7.0
1.0 to 2.0
Nickel (Ni), % 0 to 1.0
30 to 32
Nitrogen (N), % 0 to 0.25
0.3 to 0.5
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0
0 to 0.010