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AISI 420 Stainless Steel vs. EN AC-21100 Aluminum

AISI 420 stainless steel belongs to the iron alloys classification, while EN AC-21100 aluminum belongs to the aluminum alloys. There are 30 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 420 stainless steel and the bottom bar is EN AC-21100 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
100 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 8.0 to 15
6.2 to 7.3
Fatigue Strength, MPa 220 to 670
79 to 87
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 76
27
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
340 to 350
Tensile Strength: Yield (Proof), MPa 380 to 1310
210 to 240

Thermal Properties

Latent Heat of Fusion, J/g 280
390
Maximum Temperature: Mechanical, °C 620
170
Melting Completion (Liquidus), °C 1510
670
Melting Onset (Solidus), °C 1450
550
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 27
130
Thermal Expansion, µm/m-K 10
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
34
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
100

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
11
Density, g/cm3 7.7
3.0
Embodied Carbon, kg CO2/kg material 2.0
8.0
Embodied Energy, MJ/kg 28
150
Embodied Water, L/kg 100
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
19 to 21
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
300 to 400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 25 to 62
31 to 33
Strength to Weight: Bending, points 22 to 41
36 to 37
Thermal Diffusivity, mm2/s 7.3
48
Thermal Shock Resistance, points 25 to 62
15

Alloy Composition

Aluminum (Al), % 0
93.4 to 95.7
Carbon (C), % 0.15 to 0.4
0
Chromium (Cr), % 12 to 14
0
Copper (Cu), % 0
4.2 to 5.2
Iron (Fe), % 82.3 to 87.9
0 to 0.19
Manganese (Mn), % 0 to 1.0
0 to 0.55
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.18
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0.15 to 0.3
Zinc (Zn), % 0
0 to 0.070
Residuals, % 0
0 to 0.1