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328.0 Aluminum vs. AISI 440A Stainless Steel

328.0 aluminum belongs to the aluminum alloys classification, while AISI 440A stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 328.0 aluminum and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 1.6 to 2.1
5.0 to 20
Fatigue Strength, MPa 55 to 80
270 to 790
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Tensile Strength: Ultimate (UTS), MPa 200 to 270
730 to 1790
Tensile Strength: Yield (Proof), MPa 120 to 170
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 510
280
Maximum Temperature: Mechanical, °C 180
760
Melting Completion (Liquidus), °C 620
1480
Melting Onset (Solidus), °C 560
1370
Specific Heat Capacity, J/kg-K 890
480
Thermal Conductivity, W/m-K 120
23
Thermal Expansion, µm/m-K 22
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 99
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 7.8
2.2
Embodied Energy, MJ/kg 140
31
Embodied Water, L/kg 1070
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.8 to 5.0
87 to 120
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 51
25
Strength to Weight: Axial, points 21 to 28
26 to 65
Strength to Weight: Bending, points 28 to 34
23 to 43
Thermal Diffusivity, mm2/s 50
6.2
Thermal Shock Resistance, points 9.2 to 12
26 to 65

Alloy Composition


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Aluminum (Al), % 84.5 to 91.1
0
Carbon (C), % 0
0.6 to 0.75
Chromium (Cr), % 0 to 0.35
16 to 18
Copper (Cu), % 1.0 to 2.0
0
Iron (Fe), % 0 to 1.0
78.4 to 83.4
Magnesium (Mg), % 0.2 to 0.6
0
Manganese (Mn), % 0.2 to 0.6
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Nickel (Ni), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 7.5 to 8.5
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 1.5
0
Residuals, % 0 to 0.5
0