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1235 Aluminum vs. AISI 418 Stainless Steel

1235 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 1235 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, % 28 to 34
17
Fatigue Strength, MPa 23 to 58
520
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 52 to 56
680
Tensile Strength: Ultimate (UTS), MPa 80 to 84
1100
Tensile Strength: Yield (Proof), MPa 23 to 57
850

Thermal Properties

Latent Heat of Fusion, J/g 400
270
Maximum Temperature: Mechanical, °C 170
770
Melting Completion (Liquidus), °C 640
1500
Melting Onset (Solidus), °C 640
1460
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 230
25
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 200
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.7
8.0
Embodied Carbon, kg CO2/kg material 8.3
2.9
Embodied Energy, MJ/kg 160
41
Embodied Water, L/kg 1190
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 25
170
Resilience: Unit (Modulus of Resilience), kJ/m3 3.8 to 24
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 8.2 to 8.6
38
Strength to Weight: Bending, points 15 to 16
29
Thermal Diffusivity, mm2/s 93
6.7
Thermal Shock Resistance, points 3.6 to 3.7
40

Alloy Composition

Aluminum (Al), % 99.35 to 100
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.65
78.5 to 83.6
Magnesium (Mg), % 0 to 0.050
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 0.65
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.060
0
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.1
0