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R30021 Cobalt vs. AWS E330

R30021 cobalt belongs to the cobalt alloys classification, while AWS E330 belongs to the iron alloys. They have a modest 21% 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 R30021 cobalt and the bottom bar is AWS E330.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
29
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 700
580

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1400
Melting Onset (Solidus), °C 1190
1350
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
5.4
Embodied Energy, MJ/kg 110
75
Embodied Water, L/kg 520
180

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
20
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.18 to 0.25
Chromium (Cr), % 26 to 29
14 to 17
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 3.0
40.7 to 51.8
Manganese (Mn), % 0
1.0 to 2.5
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.75
Nickel (Ni), % 2.0 to 3.0
33 to 37
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030