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7475 Aluminum vs. ASTM Grade HN Steel

7475 aluminum belongs to the aluminum alloys classification, while ASTM grade HN steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (10, 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 7475 aluminum and the bottom bar is ASTM grade HN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 10 to 12
9.0
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 530 to 590
500

Thermal Properties

Latent Heat of Fusion, J/g 380
310
Maximum Temperature: Mechanical, °C 180
1080
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 480
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140 to 160
13
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
26
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 8.2
4.6
Embodied Energy, MJ/kg 150
66
Embodied Water, L/kg 1130
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 49 to 55
17
Strength to Weight: Bending, points 48 to 52
18
Thermal Diffusivity, mm2/s 53 to 63
3.5
Thermal Shock Resistance, points 23 to 26
11

Alloy Composition

Aluminum (Al), % 88.6 to 91.6
0
Carbon (C), % 0
0.2 to 0.5
Chromium (Cr), % 0.18 to 0.25
19 to 23
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.12
44.9 to 57.8
Magnesium (Mg), % 1.9 to 2.6
0
Manganese (Mn), % 0 to 0.060
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
23 to 27
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.060
0
Zinc (Zn), % 5.1 to 6.2
0
Residuals, % 0 to 0.15
0