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8021 Aluminum vs. EN 1.4640 Stainless Steel

8021 aluminum belongs to the aluminum alloys classification, while EN 1.4640 stainless steel belongs to the iron 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 8021 aluminum and the bottom bar is EN 1.4640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 2.3
51
Fatigue Strength, MPa 61
230 to 250
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 160
620 to 650
Tensile Strength: Yield (Proof), MPa 130
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 170
930
Melting Completion (Liquidus), °C 650
1420
Melting Onset (Solidus), °C 640
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 220
15
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 180
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
14
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 1180
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
250 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 130
150 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
25
Strength to Weight: Axial, points 16
22 to 23
Strength to Weight: Bending, points 23
21
Thermal Diffusivity, mm2/s 88
4.0
Thermal Shock Resistance, points 7.0
14 to 15

Alloy Composition

Aluminum (Al), % 98 to 98.8
0
Carbon (C), % 0
0.030 to 0.080
Chromium (Cr), % 0
18 to 19
Copper (Cu), % 0 to 0.050
1.3 to 2.0
Iron (Fe), % 1.2 to 1.7
67.4 to 73.6
Manganese (Mn), % 0
1.5 to 4.0
Nickel (Ni), % 0
5.5 to 6.9
Nitrogen (N), % 0
0.030 to 0.11
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.15
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Residuals, % 0 to 0.15
0