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7178 Aluminum vs. EN 1.4938 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.4938 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
16 to 17
Fatigue Strength, MPa 120 to 210
390 to 520
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
76
Shear Strength, MPa 140 to 380
540 to 630
Tensile Strength: Ultimate (UTS), MPa 240 to 640
870 to 1030
Tensile Strength: Yield (Proof), MPa 120 to 560
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Maximum Temperature: Mechanical, °C 180
750
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
30
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 91
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.3
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1110
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
1050 to 1920
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 21 to 58
31 to 37
Strength to Weight: Bending, points 28 to 54
26 to 29
Thermal Diffusivity, mm2/s 47
8.1
Thermal Shock Resistance, points 10 to 28
30 to 35

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.080 to 0.15
Chromium (Cr), % 0.18 to 0.28
11 to 12.5
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
80.5 to 84.8
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.4 to 0.9
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 0
2.0 to 3.0
Nitrogen (N), % 0
0.020 to 0.040
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0
0.25 to 0.4
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants