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ACI-ASTM CN7MS Steel vs. EN AC-21200 Aluminum

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while EN AC-21200 aluminum belongs to the aluminum 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 ACI-ASTM CN7MS steel and the bottom bar is EN AC-21200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
120 to 130
Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 39
3.9 to 6.2
Fatigue Strength, MPa 200
110 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 540
410 to 440
Tensile Strength: Yield (Proof), MPa 230
270 to 360

Thermal Properties

Latent Heat of Fusion, J/g 340
390
Maximum Temperature: Mechanical, °C 1040
170
Melting Completion (Liquidus), °C 1400
660
Melting Onset (Solidus), °C 1350
550
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 12
130
Thermal Expansion, µm/m-K 16
23

Otherwise Unclassified Properties

Base Metal Price, % relative 28
10
Density, g/cm3 7.9
3.0
Embodied Carbon, kg CO2/kg material 5.1
8.0
Embodied Energy, MJ/kg 71
150
Embodied Water, L/kg 180
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
16 to 22
Resilience: Unit (Modulus of Resilience), kJ/m3 140
500 to 930
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 19
38 to 40
Strength to Weight: Bending, points 19
41 to 43
Thermal Diffusivity, mm2/s 3.2
49
Thermal Shock Resistance, points 13
18 to 19

Alloy Composition

Aluminum (Al), % 0
93.3 to 95.7
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
4.0 to 5.0
Iron (Fe), % 45.4 to 53.5
0 to 0.2
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 0
0.15 to 0.5
Manganese (Mn), % 0 to 1.0
0.2 to 0.5
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0 to 0.050
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 2.5 to 3.5
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
0 to 0.030
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.1