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EN AC-44000 Aluminum vs. S31277 Stainless Steel

EN AC-44000 aluminum belongs to the aluminum alloys classification, while S31277 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, 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-44000 aluminum and the bottom bar is S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
210
Elongation at Break, % 7.3
45
Fatigue Strength, MPa 64
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
80
Tensile Strength: Ultimate (UTS), MPa 180
860
Tensile Strength: Yield (Proof), MPa 86
410

Thermal Properties

Latent Heat of Fusion, J/g 560
310
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 590
1410
Specific Heat Capacity, J/kg-K 910
460
Thermal Expansion, µm/m-K 21
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
36
Density, g/cm3 2.5
8.1
Embodied Carbon, kg CO2/kg material 7.8
6.7
Embodied Energy, MJ/kg 150
90
Embodied Water, L/kg 1070
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
320
Resilience: Unit (Modulus of Resilience), kJ/m3 51
410
Stiffness to Weight: Axial, points 16
14
Stiffness to Weight: Bending, points 55
24
Strength to Weight: Axial, points 20
29
Strength to Weight: Bending, points 28
25
Thermal Shock Resistance, points 8.4
19

Alloy Composition

Aluminum (Al), % 87.1 to 90
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
20.5 to 23
Copper (Cu), % 0 to 0.050
0.5 to 1.5
Iron (Fe), % 0 to 0.19
35.5 to 46.2
Magnesium (Mg), % 0 to 0.45
0
Manganese (Mn), % 0 to 0.1
0 to 3.0
Molybdenum (Mo), % 0
6.5 to 8.0
Nickel (Ni), % 0
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 10 to 11.8
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0