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AWS E330 vs. R31538 Cobalt

AWS E330 belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. 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 AWS E330 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 29
13 to 23
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 580
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1350
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 5.4
8.1
Embodied Energy, MJ/kg 75
110
Embodied Water, L/kg 180
530

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
34 to 45
Strength to Weight: Bending, points 19
27 to 32
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 16
25 to 33

Alloy Composition

Carbon (C), % 0.18 to 0.25
0.15 to 0.35
Chromium (Cr), % 14 to 17
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 40.7 to 51.8
0 to 0.75
Manganese (Mn), % 1.0 to 2.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
5.0 to 7.0
Nickel (Ni), % 33 to 37
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