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7175 Aluminum vs. EN 1.3518 Steel

7175 aluminum belongs to the aluminum alloys classification, while EN 1.3518 steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, 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 7175 aluminum and the bottom bar is EN 1.3518 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
72
Tensile Strength: Ultimate (UTS), MPa 520 to 570
630

Thermal Properties

Latent Heat of Fusion, J/g 380
260
Maximum Temperature: Mechanical, °C 180
420
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 480
1400
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
43
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 99
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.4
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1130
51

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 48 to 52
23
Strength to Weight: Bending, points 48 to 51
21
Thermal Diffusivity, mm2/s 53
12
Thermal Shock Resistance, points 23 to 25
19

Alloy Composition

Aluminum (Al), % 88 to 91.4
0 to 0.050
Carbon (C), % 0
0.93 to 1.1
Chromium (Cr), % 0.18 to 0.28
0.9 to 1.2
Copper (Cu), % 1.2 to 2.0
0 to 0.3
Iron (Fe), % 0 to 0.2
96.3 to 97.8
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
0.9 to 1.2
Molybdenum (Mo), % 0
0 to 0.1
Oxygen (O), % 0
0 to 0.0015
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.15
0.45 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0