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EN AC-21100 Aluminum vs. EN 1.4021 Stainless Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while EN 1.4021 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 EN AC-21100 aluminum and the bottom bar is EN 1.4021 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 6.2 to 7.3
11 to 17
Fatigue Strength, MPa 79 to 87
240 to 380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
76
Tensile Strength: Ultimate (UTS), MPa 340 to 350
630 to 880
Tensile Strength: Yield (Proof), MPa 210 to 240
390 to 670

Thermal Properties

Latent Heat of Fusion, J/g 390
270
Maximum Temperature: Mechanical, °C 170
760
Melting Completion (Liquidus), °C 670
1440
Melting Onset (Solidus), °C 550
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 130
30
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 100
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
7.0
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 8.0
1.9
Embodied Energy, MJ/kg 150
27
Embodied Water, L/kg 1150
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
88 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
400 to 1160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 31 to 33
23 to 31
Strength to Weight: Bending, points 36 to 37
21 to 26
Thermal Diffusivity, mm2/s 48
8.1
Thermal Shock Resistance, points 15
22 to 31

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0.16 to 0.25
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
83.2 to 87.8
Manganese (Mn), % 0 to 0.55
0 to 1.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0