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4343 Aluminum vs. AISI 445 Stainless Steel

4343 aluminum belongs to the aluminum alloys classification, while AISI 445 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 445 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.4
25
Fatigue Strength, MPa 45
160
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 64
310
Tensile Strength: Ultimate (UTS), MPa 110
480
Tensile Strength: Yield (Proof), MPa 62
230

Thermal Properties

Latent Heat of Fusion, J/g 510
290
Maximum Temperature: Mechanical, °C 160
950
Melting Completion (Liquidus), °C 620
1440
Melting Onset (Solidus), °C 580
1390
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 180
21
Thermal Expansion, µm/m-K 22
11

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
12
Density, g/cm3 2.6
7.7
Embodied Carbon, kg CO2/kg material 7.9
2.6
Embodied Energy, MJ/kg 150
38
Embodied Water, L/kg 1100
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.1
98
Resilience: Unit (Modulus of Resilience), kJ/m3 27
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 53
25
Strength to Weight: Axial, points 12
17
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 77
5.6
Thermal Shock Resistance, points 5.2
16

Alloy Composition

Aluminum (Al), % 90.3 to 93.2
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
19 to 21
Copper (Cu), % 0 to 0.25
0.3 to 0.6
Iron (Fe), % 0 to 0.8
74.9 to 80.7
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0
0 to 0.6
Niobium (Nb), % 0
0 to 0.8
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 6.8 to 8.2
0 to 1.0
Sulfur (S), % 0
0 to 0.012
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0