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EN AC-71100 Aluminum vs. ASTM A387 Grade 21 Steel

EN AC-71100 aluminum belongs to the aluminum alloys classification, while ASTM A387 grade 21 steel belongs to the iron alloys. There are 28 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 EN AC-71100 aluminum and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 72
190
Elongation at Break, % 1.1
21
Fatigue Strength, MPa 150
160 to 250
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
74
Tensile Strength: Ultimate (UTS), MPa 260
500 to 590
Tensile Strength: Yield (Proof), MPa 230
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 490
260
Maximum Temperature: Mechanical, °C 170
480
Melting Completion (Liquidus), °C 580
1470
Melting Onset (Solidus), °C 520
1430
Specific Heat Capacity, J/kg-K 860
470
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 32
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 97
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
4.1
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 7.4
1.8
Embodied Energy, MJ/kg 140
23
Embodied Water, L/kg 1010
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.8
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 360
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 25
18 to 21
Strength to Weight: Bending, points 31
18 to 20
Thermal Shock Resistance, points 12
14 to 17

Alloy Composition

Aluminum (Al), % 78.7 to 83.3
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
2.8 to 3.3
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.3
94.4 to 96
Magnesium (Mg), % 0.2 to 0.5
0
Manganese (Mn), % 0 to 0.15
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 7.5 to 9.5
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 9.0 to 10.5
0
Residuals, % 0 to 0.15
0