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AWS E312 vs. R31539 Cobalt

AWS E312 belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AWS E312 and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 25
13 to 22
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 740
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1410
1360
Melting Onset (Solidus), °C 1360
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.6
8.2
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 200
530

Common Calculations

Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
33 to 44
Strength to Weight: Bending, points 24
27 to 32
Thermal Shock Resistance, points 18
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.15
0 to 0.14
Chromium (Cr), % 28 to 32
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 52.3 to 63.5
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0.5 to 2.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
5.0 to 7.0
Nickel (Ni), % 8.0 to 10.5
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0