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4145 Aluminum vs. EN 1.7365 Steel

4145 aluminum belongs to the aluminum alloys classification, while EN 1.7365 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 4145 aluminum and the bottom bar is EN 1.7365 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.2
18
Fatigue Strength, MPa 48
320
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
74
Tensile Strength: Ultimate (UTS), MPa 120
700
Tensile Strength: Yield (Proof), MPa 68
470

Thermal Properties

Latent Heat of Fusion, J/g 540
260
Maximum Temperature: Mechanical, °C 160
510
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
40
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
8.2
Electrical Conductivity: Equal Weight (Specific), % IACS 84
9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
4.4
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
1.8
Embodied Energy, MJ/kg 140
24
Embodied Water, L/kg 1040
70

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
110
Resilience: Unit (Modulus of Resilience), kJ/m3 31
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
25
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 42
11
Thermal Shock Resistance, points 5.5
20

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.12 to 0.19
Chromium (Cr), % 0 to 0.15
4.0 to 6.0
Copper (Cu), % 3.3 to 4.7
0 to 0.3
Iron (Fe), % 0 to 0.8
91.2 to 94.9
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.5 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.65
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 9.3 to 10.7
0 to 0.8
Sulfur (S), % 0
0 to 0.025
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0