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7075 Aluminum vs. EN 1.4945 Stainless Steel

7075 aluminum belongs to the aluminum alloys classification, while EN 1.4945 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 7075 aluminum and the bottom bar is EN 1.4945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 1.8 to 12
19 to 34
Fatigue Strength, MPa 110 to 190
230 to 350
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 150 to 340
430 to 460
Tensile Strength: Ultimate (UTS), MPa 240 to 590
640 to 740
Tensile Strength: Yield (Proof), MPa 120 to 510
290 to 550

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 200
920
Melting Completion (Liquidus), °C 640
1490
Melting Onset (Solidus), °C 480
1440
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 130
14
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 98
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 10
30
Density, g/cm3 3.0
8.1
Embodied Carbon, kg CO2/kg material 8.3
5.0
Embodied Energy, MJ/kg 150
73
Embodied Water, L/kg 1120
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
130 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 1870
210 to 760
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 22 to 54
22 to 25
Strength to Weight: Bending, points 28 to 52
20 to 22
Thermal Diffusivity, mm2/s 50
3.7
Thermal Shock Resistance, points 10 to 25
14 to 16

Alloy Composition


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Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0.040 to 0.1
Chromium (Cr), % 0.18 to 0.28
15.5 to 17.5
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.5
57.9 to 65.7
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0 to 1.5
Nickel (Ni), % 0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0
0.060 to 0.14
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.4
0.3 to 0.6
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0