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2218 Aluminum vs. EN 1.4303 Stainless Steel

2218 aluminum belongs to the aluminum alloys classification, while EN 1.4303 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 2218 aluminum and the bottom bar is EN 1.4303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
190 to 270
Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 6.8 to 10
13 to 49
Fatigue Strength, MPa 110
220 to 320
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 210 to 250
420 to 540
Tensile Strength: Ultimate (UTS), MPa 330 to 430
590 to 900
Tensile Strength: Yield (Proof), MPa 260 to 310
230 to 560

Thermal Properties

Latent Heat of Fusion, J/g 390
290
Maximum Temperature: Mechanical, °C 220
940
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 510
1380
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 22
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 11
17
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.2
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1130
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
110 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
140 to 800
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 30 to 39
21 to 32
Strength to Weight: Bending, points 34 to 41
20 to 26
Thermal Diffusivity, mm2/s 52
4.0
Thermal Shock Resistance, points 15 to 19
13 to 20

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0 to 0.1
17 to 19
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
64.8 to 72
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0 to 2.0
Nickel (Ni), % 1.7 to 2.3
11 to 13
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.9
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants