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AWS E308 vs. AWS E308LMo

Both AWS E308 and AWS E308LMo are iron alloys. Both are furnished in the as-welded condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is AWS E308 and the bottom bar is AWS E308LMo.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
40
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 620
580

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1380
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 14
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
3.8
Embodied Energy, MJ/kg 46
53
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 21
28
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
21
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 4.2
4.2
Thermal Shock Resistance, points 16
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.040
Chromium (Cr), % 18 to 21
18 to 21
Copper (Cu), % 0 to 0.75
0 to 0.75
Iron (Fe), % 62.9 to 72.5
59.6 to 70.5
Manganese (Mn), % 0.5 to 2.5
0.5 to 2.5
Molybdenum (Mo), % 0 to 0.75
2.0 to 3.0
Nickel (Ni), % 9.0 to 11
9.0 to 12
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