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4343 Aluminum vs. AISI 418 Stainless Steel

4343 aluminum belongs to the aluminum alloys classification, while AISI 418 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 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.4
17
Fatigue Strength, MPa 45
520
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 64
680
Tensile Strength: Ultimate (UTS), MPa 110
1100
Tensile Strength: Yield (Proof), MPa 62
850

Thermal Properties

Latent Heat of Fusion, J/g 510
270
Maximum Temperature: Mechanical, °C 160
770
Melting Completion (Liquidus), °C 620
1500
Melting Onset (Solidus), °C 580
1460
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 180
25
Thermal Expansion, µm/m-K 22
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 150
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.6
8.0
Embodied Carbon, kg CO2/kg material 7.9
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 1100
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.1
170
Resilience: Unit (Modulus of Resilience), kJ/m3 27
1830
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 53
24
Strength to Weight: Axial, points 12
38
Strength to Weight: Bending, points 20
29
Thermal Diffusivity, mm2/s 77
6.7
Thermal Shock Resistance, points 5.2
40

Alloy Composition

Aluminum (Al), % 90.3 to 93.2
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.8
78.5 to 83.6
Manganese (Mn), % 0 to 0.1
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
1.8 to 2.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 6.8 to 8.2
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0