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7204 Aluminum vs. EN 1.4458 Stainless Steel

7204 aluminum belongs to the aluminum alloys classification, while EN 1.4458 stainless 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 7204 aluminum and the bottom bar is EN 1.4458 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 11 to 13
34
Fatigue Strength, MPa 110 to 130
150
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Tensile Strength: Ultimate (UTS), MPa 220 to 380
510
Tensile Strength: Yield (Proof), MPa 120 to 310
190

Thermal Properties

Latent Heat of Fusion, J/g 380
300
Maximum Temperature: Mechanical, °C 210
1100
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 520
1370
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
30
Density, g/cm3 2.9
8.0
Embodied Carbon, kg CO2/kg material 8.4
5.4
Embodied Energy, MJ/kg 150
75
Embodied Water, L/kg 1140
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 25 to 40
140
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 710
89
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 21 to 36
17
Strength to Weight: Bending, points 28 to 40
18
Thermal Diffusivity, mm2/s 58
4.2
Thermal Shock Resistance, points 9.4 to 16
12

Alloy Composition

Aluminum (Al), % 90.5 to 94.8
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.3
19 to 22
Copper (Cu), % 0 to 0.2
0 to 2.0
Iron (Fe), % 0 to 0.35
40.2 to 53
Magnesium (Mg), % 1.0 to 2.0
0
Manganese (Mn), % 0.2 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 0
26 to 30
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0 to 0.1
0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0