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7175 Aluminum vs. S33228 Stainless Steel

7175 aluminum belongs to the aluminum alloys classification, while S33228 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 S33228 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 3.8 to 5.9
34
Fatigue Strength, MPa 150 to 180
170
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
79
Shear Strength, MPa 290 to 330
380
Tensile Strength: Ultimate (UTS), MPa 520 to 570
570
Tensile Strength: Yield (Proof), MPa 430 to 490
210

Thermal Properties

Latent Heat of Fusion, J/g 380
310
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 640
1410
Melting Onset (Solidus), °C 480
1360
Specific Heat Capacity, J/kg-K 870
470
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
37
Density, g/cm3 3.0
8.0
Embodied Carbon, kg CO2/kg material 8.2
6.2
Embodied Energy, MJ/kg 150
89
Embodied Water, L/kg 1130
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 48 to 52
20
Strength to Weight: Bending, points 48 to 51
19
Thermal Shock Resistance, points 23 to 25
13

Alloy Composition

Aluminum (Al), % 88 to 91.4
0 to 0.025
Carbon (C), % 0
0.040 to 0.080
Cerium (Ce), % 0
0.050 to 0.1
Chromium (Cr), % 0.18 to 0.28
26 to 28
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.2
36.5 to 42.3
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0
31 to 33
Niobium (Nb), % 0
0.6 to 1.0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.15
0 to 0.3
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0