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R31233 Cobalt vs. AWS E308

R31233 cobalt belongs to the cobalt alloys classification, while AWS E308 belongs to the iron alloys. They have a modest 33% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is AWS E308.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 17
40
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 1020
620

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 12
16
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
3.2
Embodied Energy, MJ/kg 110
46
Embodied Water, L/kg 480
150

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
22
Strength to Weight: Bending, points 26
21
Thermal Diffusivity, mm2/s 3.2
4.2
Thermal Shock Resistance, points 25
16

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0 to 0.080
Chromium (Cr), % 23.5 to 27.5
18 to 21
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 1.0 to 5.0
62.9 to 72.5
Manganese (Mn), % 0.1 to 1.5
0.5 to 2.5
Molybdenum (Mo), % 4.0 to 6.0
0 to 0.75
Nickel (Ni), % 7.0 to 11
9.0 to 11
Nitrogen (N), % 0.030 to 0.12
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.0 to 3.0
0