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SAE-AISI A8 Steel vs. 7049A Aluminum

SAE-AISI A8 steel belongs to the iron alloys classification, while 7049A aluminum belongs to the aluminum 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 SAE-AISI A8 steel and the bottom bar is 7049A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
71
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 74
27
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
580 to 590

Thermal Properties

Latent Heat of Fusion, J/g 270
370
Melting Completion (Liquidus), °C 1480
640
Melting Onset (Solidus), °C 1430
430
Specific Heat Capacity, J/kg-K 470
850
Thermal Conductivity, W/m-K 37
130
Thermal Expansion, µm/m-K 12
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
40
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
10
Density, g/cm3 7.9
3.1
Embodied Carbon, kg CO2/kg material 2.3
8.2
Embodied Energy, MJ/kg 31
150
Embodied Water, L/kg 73
1100

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
44
Strength to Weight: Axial, points 25 to 68
52 to 53
Strength to Weight: Bending, points 22 to 44
50 to 51
Thermal Diffusivity, mm2/s 9.9
50
Thermal Shock Resistance, points 22 to 62
25

Alloy Composition

Aluminum (Al), % 0
84.6 to 89.5
Carbon (C), % 0.5 to 0.6
0
Chromium (Cr), % 4.8 to 5.5
0.050 to 0.25
Copper (Cu), % 0 to 0.25
1.2 to 1.9
Iron (Fe), % 88.5 to 91.9
0 to 0.5
Magnesium (Mg), % 0
2.1 to 3.1
Manganese (Mn), % 0 to 0.5
0 to 0.5
Molybdenum (Mo), % 1.2 to 1.7
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.75 to 1.1
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Tungsten (W), % 1.0 to 1.5
0
Zinc (Zn), % 0
7.2 to 8.4
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15