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4343 Aluminum vs. AISI 420 Stainless Steel

4343 aluminum belongs to the aluminum alloys classification, while AISI 420 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 4343 aluminum and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.4
8.0 to 15
Fatigue Strength, MPa 45
220 to 670
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
76
Shear Strength, MPa 64
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 110
690 to 1720
Tensile Strength: Yield (Proof), MPa 62
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 510
280
Maximum Temperature: Mechanical, °C 160
620
Melting Completion (Liquidus), °C 620
1510
Melting Onset (Solidus), °C 580
1450
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 180
27
Thermal Expansion, µm/m-K 22
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 150
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
7.5
Density, g/cm3 2.6
7.7
Embodied Carbon, kg CO2/kg material 7.9
2.0
Embodied Energy, MJ/kg 150
28
Embodied Water, L/kg 1100
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.1
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 27
380 to 4410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 53
25
Strength to Weight: Axial, points 12
25 to 62
Strength to Weight: Bending, points 20
22 to 41
Thermal Diffusivity, mm2/s 77
7.3
Thermal Shock Resistance, points 5.2
25 to 62

Alloy Composition

Aluminum (Al), % 90.3 to 93.2
0
Carbon (C), % 0
0.15 to 0.4
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.8
82.3 to 87.9
Manganese (Mn), % 0 to 0.1
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 6.8 to 8.2
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0