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380.0 Aluminum vs. SAE-AISI 8642 Steel

380.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8642 steel belongs to the iron alloys. 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 380.0 aluminum and the bottom bar is SAE-AISI 8642 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 80
170
Elastic (Young's, Tensile) Modulus, GPa 74
190
Elongation at Break, % 3.0
23
Fatigue Strength, MPa 140
270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
73
Shear Strength, MPa 190
370
Tensile Strength: Ultimate (UTS), MPa 320
580
Tensile Strength: Yield (Proof), MPa 160
380

Thermal Properties

Latent Heat of Fusion, J/g 510
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 540
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 100
39
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 83
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.6
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 7.5
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 1040
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 8.0
120
Resilience: Unit (Modulus of Resilience), kJ/m3 170
390
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 48
24
Strength to Weight: Axial, points 31
20
Strength to Weight: Bending, points 36
20
Thermal Diffusivity, mm2/s 40
10
Thermal Shock Resistance, points 14
17

Alloy Composition

Aluminum (Al), % 79.6 to 89.5
0
Carbon (C), % 0
0.4 to 0.45
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 0 to 2.0
96.6 to 97.8
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.5
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 7.5 to 9.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tin (Sn), % 0 to 0.35
0
Zinc (Zn), % 0 to 3.0
0
Residuals, % 0 to 0.5
0