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AWS E2209 vs. R30816 Cobalt

AWS E2209 belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. 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 E2209 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 23
23
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 79
81
Tensile Strength: Ultimate (UTS), MPa 770
1020

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1440
1540
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 4.0
20
Embodied Energy, MJ/kg 55
320
Embodied Water, L/kg 170
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 27
31
Strength to Weight: Bending, points 24
25
Thermal Diffusivity, mm2/s 4.3
3.3
Thermal Shock Resistance, points 20
28

Alloy Composition

Carbon (C), % 0 to 0.040
0.32 to 0.42
Chromium (Cr), % 21.5 to 23.5
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 58.4 to 66.9
0 to 5.0
Manganese (Mn), % 0.5 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
3.5 to 4.5
Nickel (Ni), % 8.5 to 10.5
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0.080 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5