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EN AC-44400 Aluminum vs. AISI 309 Stainless Steel

EN AC-44400 aluminum belongs to the aluminum alloys classification, while AISI 309 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 EN AC-44400 aluminum and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 61
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.1
34 to 47
Fatigue Strength, MPa 79
250 to 280
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 210
600 to 710
Tensile Strength: Yield (Proof), MPa 110
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 540
290
Maximum Temperature: Mechanical, °C 170
980
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 590
1400
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 140
16
Thermal Expansion, µm/m-K 22
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
19
Density, g/cm3 2.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
3.6
Embodied Energy, MJ/kg 150
51
Embodied Water, L/kg 1080
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.3
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 85
170 to 310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 54
25
Strength to Weight: Axial, points 23
21 to 25
Strength to Weight: Bending, points 31
20 to 23
Thermal Diffusivity, mm2/s 60
4.3
Thermal Shock Resistance, points 9.8
14 to 16

Alloy Composition

Aluminum (Al), % 87.1 to 92
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
22 to 24
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.65
58 to 66
Lead (Pb), % 0 to 0.050
0
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0 to 2.0
Nickel (Ni), % 0 to 0.050
12 to 15
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 8.0 to 11
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 0 to 0.050
0
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0