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R31539 Cobalt vs. AWS E307

R31539 cobalt belongs to the cobalt alloys classification, while AWS E307 belongs to the iron alloys. They have a modest 23% 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 R31539 cobalt and the bottom bar is AWS E307.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
660

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.5
Embodied Energy, MJ/kg 110
49
Embodied Water, L/kg 530
160

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
24
Strength to Weight: Bending, points 27 to 32
22
Thermal Diffusivity, mm2/s 3.5
4.1
Thermal Shock Resistance, points 24 to 32
17

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.040 to 0.14
Chromium (Cr), % 26 to 30
18 to 21.5
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 0.75
59.6 to 69.2
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
3.3 to 4.8
Molybdenum (Mo), % 5.0 to 7.0
0.5 to 1.5
Nickel (Ni), % 0 to 1.0
9.0 to 10.7
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030