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7178 Aluminum vs. S28200 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while S28200 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 7178 aluminum and the bottom bar is S28200 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
45
Fatigue Strength, MPa 120 to 210
430
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 140 to 380
610
Tensile Strength: Ultimate (UTS), MPa 240 to 640
870
Tensile Strength: Yield (Proof), MPa 120 to 560
460

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 180
900
Melting Completion (Liquidus), °C 630
1380
Melting Onset (Solidus), °C 480
1330
Specific Heat Capacity, J/kg-K 860
480
Thermal Expansion, µm/m-K 23
18

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.1
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 1110
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
330
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
540
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
26
Strength to Weight: Axial, points 21 to 58
32
Strength to Weight: Bending, points 28 to 54
27
Thermal Shock Resistance, points 10 to 28
17

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0.18 to 0.28
17 to 19
Copper (Cu), % 1.6 to 2.4
0.75 to 1.3
Iron (Fe), % 0 to 0.5
57.7 to 64.1
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
17 to 19
Molybdenum (Mo), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.4 to 0.6
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0