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1070A Aluminum vs. SAE-AISI 8740 Steel

1070A aluminum belongs to the aluminum alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. 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 1070A aluminum and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 18 to 40
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 68
190
Elongation at Break, % 2.3 to 33
11 to 23
Fatigue Strength, MPa 17 to 51
270 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 44 to 81
370 to 400
Tensile Strength: Ultimate (UTS), MPa 68 to 140
580 to 670
Tensile Strength: Yield (Proof), MPa 17 to 120
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 640
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 230
39
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 200
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.6
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1200
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.0 to 18
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 2.1 to 100
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 7.0 to 14
20 to 24
Strength to Weight: Bending, points 14 to 22
20 to 22
Thermal Diffusivity, mm2/s 94
10
Thermal Shock Resistance, points 3.1 to 6.3
17 to 20

Alloy Composition

Aluminum (Al), % 99.7 to 100
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.25
96.5 to 97.7
Magnesium (Mg), % 0 to 0.030
0
Manganese (Mn), % 0 to 0.030
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.2
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.030
0
Zinc (Zn), % 0 to 0.070
0

Comparable Variants