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7178 Aluminum vs. EN 1.4458 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.4458 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 1.4458 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
34
Fatigue Strength, MPa 120 to 210
150
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 240 to 640
510
Tensile Strength: Yield (Proof), MPa 120 to 560
190

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 630
1420
Melting Onset (Solidus), °C 480
1370
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
16
Thermal Expansion, µm/m-K 23
15

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
5.4
Embodied Energy, MJ/kg 150
75
Embodied Water, L/kg 1110
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
140
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
89
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
17
Strength to Weight: Bending, points 28 to 54
18
Thermal Diffusivity, mm2/s 47
4.2
Thermal Shock Resistance, points 10 to 28
12

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.18 to 0.28
19 to 22
Copper (Cu), % 1.6 to 2.4
0 to 2.0
Iron (Fe), % 0 to 0.5
40.2 to 53
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 2.0
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 0
26 to 30
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0