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5251 Aluminum vs. AWS E308H

5251 aluminum belongs to the aluminum alloys classification, while AWS E308H belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 5251 aluminum and the bottom bar is AWS E308H.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 2.0 to 19
40
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 180 to 280
620

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Melting Completion (Liquidus), °C 650
1420
Melting Onset (Solidus), °C 610
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
16
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.5
3.2
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1180
150

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 18 to 29
22
Strength to Weight: Bending, points 26 to 35
21
Thermal Diffusivity, mm2/s 61
4.2
Thermal Shock Resistance, points 7.9 to 13
16

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
0
Carbon (C), % 0
0.040 to 0.080
Chromium (Cr), % 0 to 0.15
18 to 21
Copper (Cu), % 0 to 0.15
0 to 0.75
Iron (Fe), % 0 to 0.5
62.9 to 72.5
Magnesium (Mg), % 1.7 to 2.4
0
Manganese (Mn), % 0.1 to 0.5
0.5 to 2.5
Molybdenum (Mo), % 0
0 to 0.75
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0