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238.0 Aluminum vs. ACI-ASTM CN7MS Steel

238.0 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CN7MS steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 238.0 aluminum and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
200
Elongation at Break, % 1.5
39
Fatigue Strength, MPa 110
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Tensile Strength: Ultimate (UTS), MPa 210
540
Tensile Strength: Yield (Proof), MPa 170
230

Thermal Properties

Latent Heat of Fusion, J/g 430
340
Maximum Temperature: Mechanical, °C 170
1040
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 510
1350
Specific Heat Capacity, J/kg-K 840
480
Thermal Conductivity, W/m-K 100
12
Thermal Expansion, µm/m-K 21
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
28
Density, g/cm3 3.4
7.9
Embodied Carbon, kg CO2/kg material 7.4
5.1
Embodied Energy, MJ/kg 140
71
Embodied Water, L/kg 1040
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
170
Resilience: Unit (Modulus of Resilience), kJ/m3 180
140
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 42
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 37
3.2
Thermal Shock Resistance, points 9.1
13

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
18 to 20
Copper (Cu), % 9.5 to 10.5
1.5 to 2.0
Iron (Fe), % 1.0 to 1.5
45.4 to 53.5
Magnesium (Mg), % 0 to 0.25
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 0
22 to 25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 3.6 to 4.4
2.5 to 3.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 1.0 to 1.5
0