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7178 Aluminum vs. EN 1.8201 Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.8201 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 7178 aluminum and the bottom bar is EN 1.8201 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
20
Fatigue Strength, MPa 120 to 210
310
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
74
Shear Strength, MPa 140 to 380
390
Tensile Strength: Ultimate (UTS), MPa 240 to 640
630
Tensile Strength: Yield (Proof), MPa 120 to 560
450

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 180
450
Melting Completion (Liquidus), °C 630
1500
Melting Onset (Solidus), °C 480
1450
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
40
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.0
Density, g/cm3 3.1
8.0
Embodied Carbon, kg CO2/kg material 8.2
2.5
Embodied Energy, MJ/kg 150
36
Embodied Water, L/kg 1110
59

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
110
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
530
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
22
Strength to Weight: Bending, points 28 to 54
20
Thermal Diffusivity, mm2/s 47
11
Thermal Shock Resistance, points 10 to 28
18

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.030
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0
0.040 to 0.1
Chromium (Cr), % 0.18 to 0.28
1.9 to 2.6
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
93.6 to 96.2
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.1 to 0.6
Molybdenum (Mo), % 0
0.050 to 0.3
Niobium (Nb), % 0
0.020 to 0.080
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.2
0.0050 to 0.060
Tungsten (W), % 0
1.5 to 1.8
Vanadium (V), % 0
0.2 to 0.3
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0