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R30016 Cobalt vs. AWS E385

R30016 cobalt belongs to the cobalt alloys classification, while AWS E385 belongs to the iron alloys. They have a modest 26% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is AWS E385.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
34
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
79
Tensile Strength: Ultimate (UTS), MPa 1010
580

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1270
1390
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 14
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.1
Embodied Carbon, kg CO2/kg material 7.7
5.8
Embodied Energy, MJ/kg 110
79
Embodied Water, L/kg 500
200

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
20
Strength to Weight: Bending, points 26
19
Thermal Diffusivity, mm2/s 3.9
3.6
Thermal Shock Resistance, points 24
15

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 28 to 32
19.5 to 21.5
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 0 to 3.0
41.8 to 50.1
Manganese (Mn), % 0.5 to 2.0
1.0 to 2.5
Molybdenum (Mo), % 0 to 1.5
4.2 to 5.2
Nickel (Ni), % 0 to 3.0
24 to 26
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.2 to 2.0
0 to 0.9
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 3.5 to 5.5
0