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358.0 Aluminum vs. SAE-AISI 8645 Steel

358.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8645 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 358.0 aluminum and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 3.5 to 6.0
12 to 23
Fatigue Strength, MPa 100 to 110
280 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 300 to 320
380 to 400
Tensile Strength: Ultimate (UTS), MPa 350 to 370
600 to 670
Tensile Strength: Yield (Proof), MPa 290 to 320
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 520
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 560
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 150
39
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 19
2.6
Density, g/cm3 2.6
7.8
Embodied Carbon, kg CO2/kg material 8.7
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 1090
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 20
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 710
420 to 840
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 53
24
Strength to Weight: Axial, points 37 to 39
21 to 24
Strength to Weight: Bending, points 42 to 44
20 to 22
Thermal Diffusivity, mm2/s 63
10
Thermal Shock Resistance, points 16 to 17
18 to 20

Alloy Composition

Aluminum (Al), % 89.1 to 91.8
0
Beryllium (Be), % 0.1 to 0.3
0
Carbon (C), % 0
0.43 to 0.48
Chromium (Cr), % 0 to 0.2
0.4 to 0.6
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.3
96.5 to 97.7
Magnesium (Mg), % 0.4 to 0.6
0
Manganese (Mn), % 0 to 0.2
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 7.6 to 8.6
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0.1 to 0.2
0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0