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SAE-AISI 1021 Steel vs. 7005 Aluminum

SAE-AISI 1021 steel belongs to the iron alloys classification, while 7005 aluminum belongs to the aluminum 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 SAE-AISI 1021 steel and the bottom bar is 7005 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 17 to 27
10 to 20
Fatigue Strength, MPa 190 to 300
100 to 190
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 310 to 320
120 to 230
Tensile Strength: Ultimate (UTS), MPa 480 to 530
200 to 400
Tensile Strength: Yield (Proof), MPa 260 to 450
95 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 400
200
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
610
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 52
140 to 170
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
35 to 43
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
110 to 130

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.5
Density, g/cm3 7.9
2.9
Embodied Carbon, kg CO2/kg material 1.4
8.3
Embodied Energy, MJ/kg 18
150
Embodied Water, L/kg 46
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
32 to 57
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 530
65 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 17 to 19
19 to 38
Strength to Weight: Bending, points 17 to 18
26 to 41
Thermal Diffusivity, mm2/s 14
54 to 65
Thermal Shock Resistance, points 15 to 17
8.7 to 18

Alloy Composition

Aluminum (Al), % 0
91 to 94.7
Carbon (C), % 0.18 to 0.23
0
Chromium (Cr), % 0
0.060 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 98.8 to 99.22
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.8
Manganese (Mn), % 0.6 to 0.9
0.2 to 0.7
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 0.35
Sulfur (S), % 0 to 0.050
0
Titanium (Ti), % 0
0.010 to 0.060
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.2
Residuals, % 0
0 to 0.15