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6351 Aluminum vs. EN 1.3551 Steel

6351 aluminum belongs to the aluminum alloys classification, while EN 1.3551 steel 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 6351 aluminum and the bottom bar is EN 1.3551 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
75
Tensile Strength: Ultimate (UTS), MPa 140 to 310
720

Thermal Properties

Latent Heat of Fusion, J/g 410
260
Maximum Temperature: Mechanical, °C 160
530
Melting Completion (Liquidus), °C 650
1490
Melting Onset (Solidus), °C 570
1450
Specific Heat Capacity, J/kg-K 900
460
Thermal Conductivity, W/m-K 180
36
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 46
8.6
Electrical Conductivity: Equal Weight (Specific), % IACS 150
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.0
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.3
4.9
Embodied Energy, MJ/kg 150
71
Embodied Water, L/kg 1180
82

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 14 to 32
26
Strength to Weight: Bending, points 22 to 38
23
Thermal Diffusivity, mm2/s 72
9.8
Thermal Shock Resistance, points 6.1 to 14
21

Alloy Composition

Aluminum (Al), % 96 to 98.5
0
Carbon (C), % 0
0.77 to 0.85
Chromium (Cr), % 0
3.9 to 4.3
Copper (Cu), % 0 to 0.1
0 to 0.3
Iron (Fe), % 0 to 0.5
88.8 to 91.1
Magnesium (Mg), % 0.4 to 0.8
0
Manganese (Mn), % 0.4 to 0.8
0.15 to 0.35
Molybdenum (Mo), % 0
4.0 to 4.5
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0.7 to 1.3
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
0 to 0.25
Vanadium (V), % 0
0.9 to 1.1
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0