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R31538 Cobalt vs. AWS E320

R31538 cobalt belongs to the cobalt alloys classification, while AWS E320 belongs to the iron alloys. They have a modest 24% 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 R31538 cobalt and the bottom bar is AWS E320.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
620

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1290
1360
Specific Heat Capacity, J/kg-K 450
460
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.1
6.5
Embodied Energy, MJ/kg 110
91
Embodied Water, L/kg 530
220

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Shock Resistance, points 25 to 33
16

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.070
Chromium (Cr), % 26 to 30
19 to 21
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 0 to 0.75
31.8 to 43.5
Manganese (Mn), % 0 to 1.0
0.5 to 2.5
Molybdenum (Mo), % 5.0 to 7.0
2.0 to 3.0
Nickel (Ni), % 0 to 1.0
32 to 36
Niobium (Nb), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030