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AWS E318 vs. AWS E308H

Both AWS E318 and AWS E308H are iron alloys. Both are furnished in the as-welded condition. They have a moderately high 95% of their average alloy composition in common.

For each property being compared, the top bar is AWS E318 and the bottom bar is AWS E308H.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 29
40
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 620
620

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 14
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 23
16
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.4
3.2
Embodied Energy, MJ/kg 62
46
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 27
21
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
22
Strength to Weight: Bending, points 20
21
Thermal Diffusivity, mm2/s 4.0
4.2
Thermal Shock Resistance, points 16
16

Alloy Composition

Carbon (C), % 0 to 0.080
0.040 to 0.080
Chromium (Cr), % 17 to 20
18 to 21
Copper (Cu), % 0 to 0.75
0 to 0.75
Iron (Fe), % 57.6 to 69.5
62.9 to 72.5
Manganese (Mn), % 0.5 to 2.5
0.5 to 2.5
Molybdenum (Mo), % 2.0 to 3.0
0 to 0.75
Nickel (Ni), % 11 to 14
9.0 to 11
Niobium (Nb), % 0 to 1.0
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