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AWS E3155 vs. R31539 Cobalt

AWS E3155 belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have 46% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is AWS E3155 and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 23
13 to 22
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 770
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 7.7
8.2
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 300
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
33 to 44
Strength to Weight: Bending, points 22
27 to 32
Thermal Diffusivity, mm2/s 3.3
3.5
Thermal Shock Resistance, points 20
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.1
0 to 0.14
Chromium (Cr), % 20 to 22.5
26 to 30
Cobalt (Co), % 18.5 to 21
57.7 to 68.7
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 23.3 to 36.3
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 1.0 to 2.5
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
5.0 to 7.0
Nickel (Ni), % 19 to 21
0 to 1.0
Niobium (Nb), % 0.75 to 1.3
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
Tungsten (W), % 2.0 to 3.0
0