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7108A Aluminum vs. AISI 418 Stainless Steel

7108A aluminum belongs to the aluminum alloys classification, while AISI 418 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 7108A aluminum and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 11 to 13
17
Fatigue Strength, MPa 120 to 130
520
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 210
680
Tensile Strength: Ultimate (UTS), MPa 350
1100
Tensile Strength: Yield (Proof), MPa 290 to 300
850

Thermal Properties

Latent Heat of Fusion, J/g 380
270
Maximum Temperature: Mechanical, °C 210
770
Melting Completion (Liquidus), °C 630
1500
Melting Onset (Solidus), °C 520
1460
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
25
Thermal Expansion, µm/m-K 24
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 110
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 2.9
8.0
Embodied Carbon, kg CO2/kg material 8.3
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 1150
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38 to 44
170
Resilience: Unit (Modulus of Resilience), kJ/m3 610 to 640
1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 33 to 34
38
Strength to Weight: Bending, points 38
29
Thermal Diffusivity, mm2/s 59
6.7
Thermal Shock Resistance, points 15 to 16
40

Alloy Composition

Aluminum (Al), % 91.6 to 94.4
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0 to 0.040
12 to 14
Copper (Cu), % 0 to 0.050
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
78.5 to 83.6
Magnesium (Mg), % 0.7 to 1.5
0
Manganese (Mn), % 0 to 0.050
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
1.8 to 2.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.030
0
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 4.8 to 5.8
0
Zirconium (Zr), % 0.15 to 0.25
0
Residuals, % 0 to 0.15
0