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7178 Aluminum vs. EN 1.4864 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.4864 stainless 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 1.4864 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
33
Fatigue Strength, MPa 120 to 210
200
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
75
Shear Strength, MPa 140 to 380
430
Tensile Strength: Ultimate (UTS), MPa 240 to 640
650
Tensile Strength: Yield (Proof), MPa 120 to 560
260

Thermal Properties

Latent Heat of Fusion, J/g 370
310
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 630
1390
Melting Onset (Solidus), °C 480
1340
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 23
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 91
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
30
Density, g/cm3 3.1
8.0
Embodied Carbon, kg CO2/kg material 8.2
5.3
Embodied Energy, MJ/kg 150
75
Embodied Water, L/kg 1110
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
170
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
170
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
23
Strength to Weight: Bending, points 28 to 54
21
Thermal Diffusivity, mm2/s 47
3.3
Thermal Shock Resistance, points 10 to 28
17

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0.18 to 0.28
15 to 17
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
41.7 to 51
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 2.0
Nickel (Ni), % 0
33 to 37
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.4
1.0 to 2.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0