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2018 Aluminum vs. EN 1.4557 Stainless Steel

2018 aluminum belongs to the aluminum alloys classification, while EN 1.4557 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 2018 aluminum and the bottom bar is EN 1.4557 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
160
Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 9.6
40
Fatigue Strength, MPa 120
260
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
80
Tensile Strength: Ultimate (UTS), MPa 420
560
Tensile Strength: Yield (Proof), MPa 310
300

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Maximum Temperature: Mechanical, °C 220
1090
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
460
Thermal Conductivity, W/m-K 150
15
Thermal Expansion, µm/m-K 22
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 11
29
Density, g/cm3 3.1
8.0
Embodied Carbon, kg CO2/kg material 8.1
5.6
Embodied Energy, MJ/kg 150
76
Embodied Water, L/kg 1130
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
190
Resilience: Unit (Modulus of Resilience), kJ/m3 670
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 41
19
Thermal Diffusivity, mm2/s 57
4.0
Thermal Shock Resistance, points 19
12

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0 to 0.1
19.5 to 20.5
Copper (Cu), % 3.5 to 4.5
0.5 to 1.0
Iron (Fe), % 0 to 1.0
49.5 to 56.3
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.2
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 1.7 to 2.3
17.5 to 19.5
Nitrogen (N), % 0
0.18 to 0.24
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.9
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0