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AWS E309L vs. AWS E309Nb

Both AWS E309L and AWS E309Nb are iron alloys. Both are furnished in the as-welded condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is AWS E309L and the bottom bar is AWS E309Nb.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
34
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 580
620

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1370
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 14
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 20
25
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
4.4
Embodied Energy, MJ/kg 52
64
Embodied Water, L/kg 180
180

Common Calculations

PREN (Pitting Resistance) 25
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
22
Strength to Weight: Bending, points 20
21
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 15
16

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.12
Chromium (Cr), % 22 to 25
22 to 25
Copper (Cu), % 0 to 0.75
0 to 0.75
Iron (Fe), % 55.9 to 65.5
54.8 to 64.8
Manganese (Mn), % 0.5 to 2.5
0.5 to 2.5
Molybdenum (Mo), % 0 to 0.75
0 to 0.75
Nickel (Ni), % 12 to 14
12 to 14
Niobium (Nb), % 0
0.7 to 1.0
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