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AISI 446 Stainless Steel vs. 8021 Aluminum

AISI 446 stainless steel belongs to the iron alloys classification, while 8021 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 AISI 446 stainless steel and the bottom bar is 8021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 23
2.3
Fatigue Strength, MPa 200
61
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 79
26
Tensile Strength: Ultimate (UTS), MPa 570
160
Tensile Strength: Yield (Proof), MPa 300
130

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 1180
170
Melting Completion (Liquidus), °C 1510
650
Melting Onset (Solidus), °C 1430
640
Specific Heat Capacity, J/kg-K 490
900
Thermal Conductivity, W/m-K 17
220
Thermal Expansion, µm/m-K 11
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
56
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
180

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 7.7
2.8
Embodied Carbon, kg CO2/kg material 2.4
8.1
Embodied Energy, MJ/kg 35
150
Embodied Water, L/kg 150
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 230
130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
49
Strength to Weight: Axial, points 21
16
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.6
88
Thermal Shock Resistance, points 19
7.0

Alloy Composition

Aluminum (Al), % 0
98 to 98.8
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 23 to 27
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 69.2 to 77
1.2 to 1.7
Manganese (Mn), % 0 to 1.5
0
Nickel (Ni), % 0 to 0.75
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0
Residuals, % 0
0 to 0.15