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4145 Aluminum vs. SAE-AISI 1070 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1070 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 4145 aluminum and the bottom bar is SAE-AISI 1070 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.2
10 to 13
Fatigue Strength, MPa 48
270 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
72
Shear Strength, MPa 69
380 to 460
Tensile Strength: Ultimate (UTS), MPa 120
640 to 760
Tensile Strength: Yield (Proof), MPa 68
420 to 560

Thermal Properties

Latent Heat of Fusion, J/g 540
250
Maximum Temperature: Mechanical, °C 160
400
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
50
Thermal Expansion, µm/m-K 21
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
10
Electrical Conductivity: Equal Weight (Specific), % IACS 84
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
1.4
Embodied Energy, MJ/kg 140
19
Embodied Water, L/kg 1040
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
59 to 86
Resilience: Unit (Modulus of Resilience), kJ/m3 31
470 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
23 to 27
Strength to Weight: Bending, points 19
21 to 24
Thermal Diffusivity, mm2/s 42
14
Thermal Shock Resistance, points 5.5
21 to 25

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.65 to 0.75
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
98.3 to 98.8
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.6 to 0.9
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0
Sulfur (S), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0