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2017A Aluminum vs. ACI-ASTM CG8M Steel

2017A aluminum belongs to the aluminum alloys classification, while ACI-ASTM CG8M steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 2017A aluminum and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 2.2 to 14
45
Fatigue Strength, MPa 92 to 130
280
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
79
Tensile Strength: Ultimate (UTS), MPa 200 to 460
550
Tensile Strength: Yield (Proof), MPa 110 to 290
300

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Maximum Temperature: Mechanical, °C 220
1020
Melting Completion (Liquidus), °C 650
1450
Melting Onset (Solidus), °C 510
1400
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
20
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 8.2
4.1
Embodied Energy, MJ/kg 150
56
Embodied Water, L/kg 1140
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.7 to 53
210
Resilience: Unit (Modulus of Resilience), kJ/m3 90 to 570
220
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 19 to 42
19
Strength to Weight: Bending, points 26 to 44
19
Thermal Diffusivity, mm2/s 56
4.3
Thermal Shock Resistance, points 8.9 to 20
12

Alloy Composition

Aluminum (Al), % 91.3 to 95.5
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.1
18 to 21
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 0.7
58.8 to 70
Magnesium (Mg), % 0.4 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
9.0 to 13
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.2 to 0.8
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0