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AWS E320LR vs. R30021 Cobalt

AWS E320LR belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 27% 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 AWS E320LR and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34
9.0
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 580
700

Thermal Properties

Latent Heat of Fusion, J/g 300
330
Melting Completion (Liquidus), °C 1410
1350
Melting Onset (Solidus), °C 1360
1190
Specific Heat Capacity, J/kg-K 460
450
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 6.2
8.0
Embodied Energy, MJ/kg 87
110
Embodied Water, L/kg 220
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
23
Strength to Weight: Bending, points 19
21
Thermal Shock Resistance, points 15
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 19 to 21
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 32.7 to 42.5
0 to 3.0
Manganese (Mn), % 1.5 to 2.5
0
Molybdenum (Mo), % 2.0 to 3.0
4.5 to 6.0
Nickel (Ni), % 32 to 36
2.0 to 3.0
Niobium (Nb), % 0 to 0.4
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 0.3
0 to 1.5
Sulfur (S), % 0 to 0.015
0