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SAE-AISI 4340 Steel vs. EN AC-71100 Aluminum

SAE-AISI 4340 steel belongs to the iron alloys classification, while EN AC-71100 aluminum belongs to the aluminum alloys. There are 28 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 4340 steel and the bottom bar is EN AC-71100 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
110
Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 12 to 22
1.1
Fatigue Strength, MPa 330 to 740
150
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
260
Tensile Strength: Yield (Proof), MPa 470 to 1150
230

Thermal Properties

Latent Heat of Fusion, J/g 250
490
Maximum Temperature: Mechanical, °C 430
170
Melting Completion (Liquidus), °C 1460
580
Melting Onset (Solidus), °C 1420
520
Specific Heat Capacity, J/kg-K 470
860
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
32
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
97

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.7
7.4
Embodied Energy, MJ/kg 22
140
Embodied Water, L/kg 53
1010

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
2.8
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
360
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 24 to 45
25
Strength to Weight: Bending, points 22 to 33
31
Thermal Shock Resistance, points 20 to 38
12

Alloy Composition

Aluminum (Al), % 0
78.7 to 83.3
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.7 to 0.9
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 95.1 to 96.3
0 to 0.3
Magnesium (Mg), % 0
0.2 to 0.5
Manganese (Mn), % 0.6 to 0.8
0 to 0.15
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
7.5 to 9.5
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
9.0 to 10.5
Residuals, % 0
0 to 0.15