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EN 1.3956 Stainless Steel vs. 7178 Aluminum

EN 1.3956 stainless steel belongs to the iron alloys classification, while 7178 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 EN 1.3956 stainless steel and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 27
4.5 to 12
Fatigue Strength, MPa 240
120 to 210
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 79
27
Tensile Strength: Ultimate (UTS), MPa 650
240 to 640
Tensile Strength: Yield (Proof), MPa 330
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 1080
180
Melting Completion (Liquidus), °C 1420
630
Melting Onset (Solidus), °C 1380
480
Specific Heat Capacity, J/kg-K 480
860
Thermal Expansion, µm/m-K 13
23

Otherwise Unclassified Properties

Base Metal Price, % relative 22
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 4.8
8.2
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 270
110 to 2220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 23
21 to 58
Strength to Weight: Bending, points 21
28 to 54
Thermal Shock Resistance, points 18
10 to 28

Alloy Composition

Aluminum (Al), % 0
85.4 to 89.5
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0.18 to 0.28
Copper (Cu), % 0
1.6 to 2.4
Iron (Fe), % 51.9 to 62.1
0 to 0.5
Magnesium (Mg), % 0
2.4 to 3.1
Manganese (Mn), % 4.0 to 6.0
0 to 0.3
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
6.3 to 7.3
Residuals, % 0
0 to 0.15