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238.0 Aluminum vs. ACI-ASTM CN7M Steel

238.0 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CN7M steel belongs to the iron alloys. There are 29 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 238.0 aluminum and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
200
Elongation at Break, % 1.5
44
Fatigue Strength, MPa 110
190
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Tensile Strength: Ultimate (UTS), MPa 210
480
Tensile Strength: Yield (Proof), MPa 170
200

Thermal Properties

Latent Heat of Fusion, J/g 430
310
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 510
1450
Specific Heat Capacity, J/kg-K 840
470
Thermal Conductivity, W/m-K 100
21
Thermal Expansion, µm/m-K 21
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 67
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 3.4
8.1
Embodied Carbon, kg CO2/kg material 7.4
5.6
Embodied Energy, MJ/kg 140
78
Embodied Water, L/kg 1040
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
170
Resilience: Unit (Modulus of Resilience), kJ/m3 180
110
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 42
24
Strength to Weight: Axial, points 17
17
Strength to Weight: Bending, points 23
17
Thermal Diffusivity, mm2/s 37
5.6
Thermal Shock Resistance, points 9.1
12

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 9.5 to 10.5
3.0 to 4.0
Iron (Fe), % 1.0 to 1.5
37.4 to 48.5
Magnesium (Mg), % 0 to 0.25
0
Manganese (Mn), % 0
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), % 3.6 to 4.4
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 1.0 to 1.5
0