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EN 1.4640 Stainless Steel vs. 7175 Aluminum

EN 1.4640 stainless steel belongs to the iron alloys classification, while 7175 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 1.4640 stainless steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 51
3.8 to 5.9
Fatigue Strength, MPa 230 to 250
150 to 180
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
26
Shear Strength, MPa 440 to 460
290 to 330
Tensile Strength: Ultimate (UTS), MPa 620 to 650
520 to 570
Tensile Strength: Yield (Proof), MPa 240 to 260
430 to 490

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 930
180
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 16
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
99

Otherwise Unclassified Properties

Base Metal Price, % relative 14
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 2.8
8.2
Embodied Energy, MJ/kg 40
150
Embodied Water, L/kg 150
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
18 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
1310 to 1730
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 22 to 23
48 to 52
Strength to Weight: Bending, points 21
48 to 51
Thermal Diffusivity, mm2/s 4.0
53
Thermal Shock Resistance, points 14 to 15
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.030 to 0.080
0
Chromium (Cr), % 18 to 19
0.18 to 0.28
Copper (Cu), % 1.3 to 2.0
1.2 to 2.0
Iron (Fe), % 67.4 to 73.6
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 1.5 to 4.0
0 to 0.1
Nickel (Ni), % 5.5 to 6.9
0
Nitrogen (N), % 0.030 to 0.11
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15