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EN 1.4826 Stainless Steel vs. 7021 Aluminum

EN 1.4826 stainless steel belongs to the iron alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 29 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 EN 1.4826 stainless steel and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 9.1
9.4
Fatigue Strength, MPa 140
150
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 500
460
Tensile Strength: Yield (Proof), MPa 260
390

Thermal Properties

Latent Heat of Fusion, J/g 310
380
Maximum Temperature: Mechanical, °C 950
200
Melting Completion (Liquidus), °C 1400
630
Melting Onset (Solidus), °C 1360
510
Specific Heat Capacity, J/kg-K 490
870
Thermal Conductivity, W/m-K 14
150
Thermal Expansion, µm/m-K 16
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
38
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
120

Otherwise Unclassified Properties

Base Metal Price, % relative 17
9.5
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 3.3
8.3
Embodied Energy, MJ/kg 47
150
Embodied Water, L/kg 160
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 39
41
Resilience: Unit (Modulus of Resilience), kJ/m3 170
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 18
44
Strength to Weight: Bending, points 18
45
Thermal Diffusivity, mm2/s 3.7
59
Thermal Shock Resistance, points 11
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Carbon (C), % 0.3 to 0.5
0
Chromium (Cr), % 21 to 23
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 60.4 to 68.7
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 2.0
0 to 0.1
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 9.0 to 11
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 1.0 to 2.5
0 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15