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7178-O Aluminum vs. Annealed S45500 Stainless Steel

7178-O aluminum belongs to the aluminum alloys classification, while annealed S45500 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-O aluminum and the bottom bar is annealed S45500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 12
3.4
Fatigue Strength, MPa 120
570
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 140
790
Tensile Strength: Ultimate (UTS), MPa 240
1370
Tensile Strength: Yield (Proof), MPa 120
1240

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Maximum Temperature: Mechanical, °C 180
760
Melting Completion (Liquidus), °C 630
1440
Melting Onset (Solidus), °C 480
1400
Specific Heat Capacity, J/kg-K 860
470
Thermal Expansion, µm/m-K 23
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
3.8
Embodied Energy, MJ/kg 150
57
Embodied Water, L/kg 1110
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24
45
Resilience: Unit (Modulus of Resilience), kJ/m3 110
4000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21
48
Strength to Weight: Bending, points 28
35
Thermal Shock Resistance, points 10
48

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
11 to 12.5
Copper (Cu), % 1.6 to 2.4
1.5 to 2.5
Iron (Fe), % 0 to 0.5
71.5 to 79.2
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
7.5 to 9.5
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0 to 0.2
0.8 to 1.4
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0