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EN 1.8151 Steel vs. 7175 Aluminum

EN 1.8151 steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum 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 EN 1.8151 steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 72
26
Tensile Strength: Ultimate (UTS), MPa 670 to 1940
520 to 570

Thermal Properties

Latent Heat of Fusion, J/g 270
380
Maximum Temperature: Mechanical, °C 410
180
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1400
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 50
140
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
99

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
10
Density, g/cm3 7.7
3.0
Embodied Carbon, kg CO2/kg material 1.8
8.2
Embodied Energy, MJ/kg 25
150
Embodied Water, L/kg 49
1130

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 24 to 70
48 to 52
Strength to Weight: Bending, points 22 to 45
48 to 51
Thermal Diffusivity, mm2/s 14
53
Thermal Shock Resistance, points 20 to 58
23 to 25

Alloy Composition


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Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.4 to 0.5
0
Chromium (Cr), % 0.4 to 0.8
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 95.9 to 97.2
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0.6 to 0.9
0 to 0.1
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 1.3 to 1.7
0 to 0.15
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0.1 to 0.2
0
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15