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7204 Aluminum vs. EN 1.4438 Stainless Steel

7204 aluminum belongs to the aluminum alloys classification, while EN 1.4438 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 1.4438 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 11 to 13
41
Fatigue Strength, MPa 110 to 130
220
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
79
Shear Strength, MPa 130 to 220
420
Tensile Strength: Ultimate (UTS), MPa 220 to 380
620
Tensile Strength: Yield (Proof), MPa 120 to 310
250

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 210
1000
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 520
1400
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
14
Thermal Expansion, µm/m-K 24
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
22
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.4
4.4
Embodied Energy, MJ/kg 150
60
Embodied Water, L/kg 1140
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 25 to 40
200
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 710
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 21 to 36
22
Strength to Weight: Bending, points 28 to 40
20
Thermal Diffusivity, mm2/s 58
3.7
Thermal Shock Resistance, points 9.4 to 16
14

Alloy Composition

Aluminum (Al), % 90.5 to 94.8
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.3
17.5 to 19.5
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.35
57.3 to 66.5
Magnesium (Mg), % 1.0 to 2.0
0
Manganese (Mn), % 0.2 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
13 to 16
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0
0 to 0.015
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