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1235 Aluminum vs. SAE-AISI A4 Steel

1235 aluminum belongs to the aluminum alloys classification, while SAE-AISI A4 steel belongs to the iron alloys. There are 23 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 1235 aluminum and the bottom bar is SAE-AISI A4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 80 to 84
710 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 640
1410
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 230
40
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 200
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
3.9
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.8
Embodied Energy, MJ/kg 160
24
Embodied Water, L/kg 1190
59

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 8.2 to 8.6
25 to 73
Strength to Weight: Bending, points 15 to 16
23 to 46
Thermal Diffusivity, mm2/s 93
11
Thermal Shock Resistance, points 3.6 to 3.7
23 to 67

Alloy Composition

Aluminum (Al), % 99.35 to 100
0
Carbon (C), % 0
1.0 to 1.1
Chromium (Cr), % 0
0.9 to 2.2
Copper (Cu), % 0 to 0.050
0 to 0.25
Iron (Fe), % 0 to 0.65
92 to 95.5
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.050
1.8 to 2.2
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.65
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.060
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.1
0