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AWS E308H vs. AWS E240

Both AWS E308H and AWS E240 are iron alloys. Both are furnished in the as-welded condition. They have 89% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AWS E308H and the bottom bar is AWS E240.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
17
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 620
770

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1420
1390
Melting Onset (Solidus), °C 1380
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 14
15

Otherwise Unclassified Properties

Base Metal Price, % relative 16
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.2
3.0
Embodied Energy, MJ/kg 46
42
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 21
22
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
28
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 4.2
3.9
Thermal Shock Resistance, points 16
19

Alloy Composition

Carbon (C), % 0.040 to 0.080
0 to 0.060
Chromium (Cr), % 18 to 21
17 to 19
Copper (Cu), % 0 to 0.75
0 to 0.75
Iron (Fe), % 62.9 to 72.5
58.6 to 68.4
Manganese (Mn), % 0.5 to 2.5
10.5 to 13.5
Molybdenum (Mo), % 0 to 0.75
0 to 0.75
Nickel (Ni), % 9.0 to 11
4.0 to 6.0
Nitrogen (N), % 0
0.1 to 0.3
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