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EN AC-21100 Aluminum vs. ACI-ASTM CN7M Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CN7M steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
140
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 6.2 to 7.3
44
Fatigue Strength, MPa 79 to 87
190
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Tensile Strength: Ultimate (UTS), MPa 340 to 350
480
Tensile Strength: Yield (Proof), MPa 210 to 240
200

Thermal Properties

Latent Heat of Fusion, J/g 390
310
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 670
1410
Melting Onset (Solidus), °C 550
1450
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 130
21
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 100
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 11
32
Density, g/cm3 3.0
8.1
Embodied Carbon, kg CO2/kg material 8.0
5.6
Embodied Energy, MJ/kg 150
78
Embodied Water, L/kg 1150
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
170
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 31 to 33
17
Strength to Weight: Bending, points 36 to 37
17
Thermal Diffusivity, mm2/s 48
5.6
Thermal Shock Resistance, points 15
12

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 4.2 to 5.2
3.0 to 4.0
Iron (Fe), % 0 to 0.19
37.4 to 48.5
Manganese (Mn), % 0 to 0.55
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
27.5 to 30.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0