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7178 Aluminum vs. SAE-AISI H12 Steel

7178 aluminum belongs to the aluminum alloys classification, while SAE-AISI H12 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 7178 aluminum and the bottom bar is SAE-AISI H12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
75
Tensile Strength: Ultimate (UTS), MPa 240 to 640
690 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Melting Completion (Liquidus), °C 630
1480
Melting Onset (Solidus), °C 480
1440
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
36
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 91
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 1110
76

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
24 to 65
Strength to Weight: Bending, points 28 to 54
22 to 42
Thermal Diffusivity, mm2/s 47
9.8
Thermal Shock Resistance, points 10 to 28
22 to 60

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.3 to 0.4
Chromium (Cr), % 0.18 to 0.28
4.8 to 5.5
Copper (Cu), % 1.6 to 2.4
0 to 0.25
Iron (Fe), % 0 to 0.5
87.8 to 91.7
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.2 to 0.5
Molybdenum (Mo), % 0
1.3 to 1.8
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0.8 to 1.2
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
1.0 to 1.7
Vanadium (V), % 0
0 to 0.5
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants