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4343 Aluminum vs. AISI 409Cb Stainless Steel

4343 aluminum belongs to the aluminum alloys classification, while AISI 409Cb stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 409Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.4
24
Fatigue Strength, MPa 45
140
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 64
270
Tensile Strength: Ultimate (UTS), MPa 110
420
Tensile Strength: Yield (Proof), MPa 62
200

Thermal Properties

Latent Heat of Fusion, J/g 510
270
Maximum Temperature: Mechanical, °C 160
710
Melting Completion (Liquidus), °C 620
1450
Melting Onset (Solidus), °C 580
1410
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 180
25
Thermal Expansion, µm/m-K 22
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 150
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
8.5
Density, g/cm3 2.6
7.8
Embodied Carbon, kg CO2/kg material 7.9
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1100
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.1
83
Resilience: Unit (Modulus of Resilience), kJ/m3 27
100
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 53
25
Strength to Weight: Axial, points 12
15
Strength to Weight: Bending, points 20
16
Thermal Diffusivity, mm2/s 77
6.7
Thermal Shock Resistance, points 5.2
15

Alloy Composition

Aluminum (Al), % 90.3 to 93.2
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
10.5 to 11.7
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.8
84.9 to 89.5
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 6.8 to 8.2
0 to 1.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0