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7178 Aluminum vs. SAE-AISI 4620 Steel

7178 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4620 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 7178 aluminum and the bottom bar is SAE-AISI 4620 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
16 to 27
Fatigue Strength, MPa 120 to 210
260 to 360
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 140 to 380
320 to 420
Tensile Strength: Ultimate (UTS), MPa 240 to 640
490 to 680
Tensile Strength: Yield (Proof), MPa 120 to 560
350 to 550

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 180
410
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
47
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
3.2
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
1.6
Embodied Energy, MJ/kg 150
22
Embodied Water, L/kg 1110
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
100 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
330 to 800
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
17 to 24
Strength to Weight: Bending, points 28 to 54
18 to 22
Thermal Diffusivity, mm2/s 47
13
Thermal Shock Resistance, points 10 to 28
15 to 20

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.17 to 0.22
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
96.4 to 97.4
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.45 to 0.65
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants