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SAE-AISI 1018 Steel vs. 7175 Aluminum

SAE-AISI 1018 steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 1018 steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 17 to 27
3.8 to 5.9
Fatigue Strength, MPa 180 to 270
150 to 180
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Shear Strength, MPa 280 to 300
290 to 330
Tensile Strength: Ultimate (UTS), MPa 430 to 480
520 to 570
Tensile Strength: Yield (Proof), MPa 240 to 400
430 to 490

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 400
180
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
480
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 52
140
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
99

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
10
Density, g/cm3 7.9
3.0
Embodied Carbon, kg CO2/kg material 1.4
8.2
Embodied Energy, MJ/kg 18
150
Embodied Water, L/kg 46
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 100
18 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
1310 to 1730
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 15 to 17
48 to 52
Strength to Weight: Bending, points 16 to 17
48 to 51
Thermal Diffusivity, mm2/s 14
53
Thermal Shock Resistance, points 14 to 15
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.15 to 0.2
0
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 98.8 to 99.25
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0.6 to 0.9
0 to 0.1
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 0.15
Sulfur (S), % 0 to 0.050
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15