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AWS E409Nb vs. R30816 Cobalt

AWS E409Nb belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS E409Nb and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 23
23
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 500
1020
Tensile Strength: Yield (Proof), MPa 380
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 25
13
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.9
20
Embodied Energy, MJ/kg 42
320
Embodied Water, L/kg 100
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
190
Resilience: Unit (Modulus of Resilience), kJ/m3 380
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 18
31
Strength to Weight: Bending, points 18
25
Thermal Diffusivity, mm2/s 6.8
3.3
Thermal Shock Resistance, points 14
28

Alloy Composition

Carbon (C), % 0 to 0.12
0.32 to 0.42
Chromium (Cr), % 11 to 14
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 80.2 to 88.5
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.75
3.5 to 4.5
Nickel (Ni), % 0 to 0.6
19 to 21
Niobium (Nb), % 0.5 to 1.5
3.5 to 4.5
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