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R30021 Cobalt vs. AWS E308H

R30021 cobalt belongs to the cobalt alloys classification, while AWS E308H 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 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 E308H.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
40
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 700
620

Thermal Properties

Latent Heat of Fusion, J/g 330
290
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
3.2
Embodied Energy, MJ/kg 110
46
Embodied Water, L/kg 520
150

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
22
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.040 to 0.080
Chromium (Cr), % 26 to 29
18 to 21
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 3.0
62.9 to 72.5
Manganese (Mn), % 0
0.5 to 2.5
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.75
Nickel (Ni), % 2.0 to 3.0
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030