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7178 Aluminum vs. EN 1.7706 Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.7706 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
17
Fatigue Strength, MPa 120 to 210
330
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 240 to 640
690
Tensile Strength: Yield (Proof), MPa 120 to 560
500

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Maximum Temperature: Mechanical, °C 180
440
Melting Completion (Liquidus), °C 630
1470
Melting Onset (Solidus), °C 480
1430
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
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
3.7
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
2.3
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1110
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
110
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
24
Strength to Weight: Bending, points 28 to 54
22
Thermal Diffusivity, mm2/s 47
11
Thermal Shock Resistance, points 10 to 28
20

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0.18 to 0.28
1.2 to 1.5
Copper (Cu), % 1.6 to 2.4
0 to 0.3
Iron (Fe), % 0 to 0.5
94.7 to 97.1
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.5 to 0.9
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0
0.2 to 0.3
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0