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EN AC-21100 Aluminum vs. EN 1.4742 Stainless Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while EN 1.4742 stainless steel belongs to the iron alloys. There are 30 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 EN AC-21100 aluminum and the bottom bar is EN 1.4742 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
180
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 6.2 to 7.3
17
Fatigue Strength, MPa 79 to 87
180
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Tensile Strength: Ultimate (UTS), MPa 340 to 350
600
Tensile Strength: Yield (Proof), MPa 210 to 240
300

Thermal Properties

Latent Heat of Fusion, J/g 390
290
Maximum Temperature: Mechanical, °C 170
1000
Melting Completion (Liquidus), °C 670
1420
Melting Onset (Solidus), °C 550
1380
Specific Heat Capacity, J/kg-K 880
490
Thermal Conductivity, W/m-K 130
19
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.0
Density, g/cm3 3.0
7.6
Embodied Carbon, kg CO2/kg material 8.0
2.2
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1150
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
84
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 31 to 33
22
Strength to Weight: Bending, points 36 to 37
21
Thermal Diffusivity, mm2/s 48
5.1
Thermal Shock Resistance, points 15
21

Alloy Composition


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Aluminum (Al), % 93.4 to 95.7
0.7 to 1.2
Carbon (C), % 0
0 to 0.12
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
77.2 to 81.6
Manganese (Mn), % 0 to 0.55
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
0.7 to 1.4
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0