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EN 1.4109 Stainless Steel vs. 7108 Aluminum

EN 1.4109 stainless steel belongs to the iron alloys classification, while 7108 aluminum belongs to the aluminum 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 EN 1.4109 stainless steel and the bottom bar is 7108 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 19
11
Fatigue Strength, MPa 270
120
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 76
26
Shear Strength, MPa 480
210
Tensile Strength: Ultimate (UTS), MPa 770
350
Tensile Strength: Yield (Proof), MPa 420
290

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 820
210
Melting Completion (Liquidus), °C 1440
630
Melting Onset (Solidus), °C 1400
530
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 30
150
Thermal Expansion, µm/m-K 10
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
39
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
120

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
9.5
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 2.2
8.3
Embodied Energy, MJ/kg 30
150
Embodied Water, L/kg 110
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
38
Resilience: Unit (Modulus of Resilience), kJ/m3 460
620
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 28
34
Strength to Weight: Bending, points 24
38
Thermal Diffusivity, mm2/s 8.1
59
Thermal Shock Resistance, points 28
16

Alloy Composition

Aluminum (Al), % 0
92.4 to 94.7
Carbon (C), % 0.6 to 0.75
0
Chromium (Cr), % 14 to 16
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 80.7 to 85
0 to 0.1
Magnesium (Mg), % 0
0.7 to 1.4
Manganese (Mn), % 0 to 1.0
0 to 0.050
Molybdenum (Mo), % 0.4 to 0.8
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.7
0 to 0.1
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.050
Zinc (Zn), % 0
4.5 to 5.5
Zirconium (Zr), % 0
0.12 to 0.25
Residuals, % 0
0 to 0.15