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4343 Aluminum vs. AISI 431 Stainless Steel

4343 aluminum belongs to the aluminum alloys classification, while AISI 431 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 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.4
15 to 17
Fatigue Strength, MPa 45
430 to 610
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 64
550 to 840
Tensile Strength: Ultimate (UTS), MPa 110
890 to 1380
Tensile Strength: Yield (Proof), MPa 62
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 510
280
Maximum Temperature: Mechanical, °C 160
850
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
26
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 150
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
9.0
Density, g/cm3 2.6
7.7
Embodied Carbon, kg CO2/kg material 7.9
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1100
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.1
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 27
1270 to 2770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 53
25
Strength to Weight: Axial, points 12
32 to 50
Strength to Weight: Bending, points 20
27 to 36
Thermal Diffusivity, mm2/s 77
7.0
Thermal Shock Resistance, points 5.2
28 to 43

Alloy Composition

Aluminum (Al), % 90.3 to 93.2
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.8
78.2 to 83.8
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0
1.3 to 2.5
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