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1070A Aluminum vs. ACI-ASTM CN7M Steel

1070A 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 (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 1070A aluminum and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 18 to 40
140
Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 2.3 to 33
44
Fatigue Strength, MPa 17 to 51
190
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 68 to 140
480
Tensile Strength: Yield (Proof), MPa 17 to 120
200

Thermal Properties

Latent Heat of Fusion, J/g 400
310
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 640
1410
Melting Onset (Solidus), °C 640
1450
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 230
21
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 200
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
32
Density, g/cm3 2.7
8.1
Embodied Carbon, kg CO2/kg material 8.2
5.6
Embodied Energy, MJ/kg 150
78
Embodied Water, L/kg 1200
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.0 to 18
170
Resilience: Unit (Modulus of Resilience), kJ/m3 2.1 to 100
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 7.0 to 14
17
Strength to Weight: Bending, points 14 to 22
17
Thermal Diffusivity, mm2/s 94
5.6
Thermal Shock Resistance, points 3.1 to 6.3
12

Alloy Composition

Aluminum (Al), % 99.7 to 100
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 0 to 0.030
3.0 to 4.0
Iron (Fe), % 0 to 0.25
37.4 to 48.5
Magnesium (Mg), % 0 to 0.030
0
Manganese (Mn), % 0 to 0.030
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 0.2
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.030
0
Zinc (Zn), % 0 to 0.070
0