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7175 Aluminum vs. EN 1.4945 Stainless Steel

7175 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 (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 7175 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, % 3.8 to 5.9
19 to 34
Fatigue Strength, MPa 150 to 180
230 to 350
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 290 to 330
430 to 460
Tensile Strength: Ultimate (UTS), MPa 520 to 570
640 to 740
Tensile Strength: Yield (Proof), MPa 430 to 490
290 to 550

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 180
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 140
14
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 99
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 10
30
Density, g/cm3 3.0
8.1
Embodied Carbon, kg CO2/kg material 8.2
5.0
Embodied Energy, MJ/kg 150
73
Embodied Water, L/kg 1130
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
130 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
210 to 760
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 48 to 52
22 to 25
Strength to Weight: Bending, points 48 to 51
20 to 22
Thermal Diffusivity, mm2/s 53
3.7
Thermal Shock Resistance, points 23 to 25
14 to 16

Alloy Composition

Aluminum (Al), % 88 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 0.2
57.9 to 65.7
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
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 0.15
0.3 to 0.6
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0