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AISI 204 Stainless Steel vs. 8021 Aluminum

AISI 204 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 (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 AISI 204 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 to 39
2.3
Fatigue Strength, MPa 320 to 720
61
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 730 to 1100
160
Tensile Strength: Yield (Proof), MPa 380 to 1080
130

Thermal Properties

Latent Heat of Fusion, J/g 280
400
Maximum Temperature: Mechanical, °C 850
170
Melting Completion (Liquidus), °C 1410
650
Melting Onset (Solidus), °C 1370
640
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 15
220
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
56
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
180

Otherwise Unclassified Properties

Base Metal Price, % relative 10
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 130
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240 to 250
3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 360 to 2940
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 27 to 40
16
Strength to Weight: Bending, points 24 to 31
23
Thermal Diffusivity, mm2/s 4.1
88
Thermal Shock Resistance, points 16 to 24
7.0

Alloy Composition

Aluminum (Al), % 0
98 to 98.8
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 15 to 17
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 69.6 to 76.4
1.2 to 1.7
Manganese (Mn), % 7.0 to 9.0
0
Nickel (Ni), % 1.5 to 3.0
0
Nitrogen (N), % 0.15 to 0.3
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