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EN AC-21100 Aluminum vs. EN 1.4740 Stainless Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while EN 1.4740 stainless steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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-21100 aluminum and the bottom bar is EN 1.4740 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
260
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 6.2 to 7.3
22
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Maximum Temperature: Mechanical, °C 170
900
Melting Completion (Liquidus), °C 670
1420
Melting Onset (Solidus), °C 550
1370
Specific Heat Capacity, J/kg-K 880
490
Thermal Conductivity, W/m-K 130
18
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 3.0
7.6
Embodied Carbon, kg CO2/kg material 8.0
2.3
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1150
120

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Thermal Diffusivity, mm2/s 48
4.8

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0.3 to 0.5
Chromium (Cr), % 0
16 to 19
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
75.4 to 82.7
Manganese (Mn), % 0 to 0.55
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
1.0 to 2.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0