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SAE-AISI 8645 Steel vs. 357.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 357.0 aluminum belongs to the aluminum 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 SAE-AISI 8645 steel and the bottom bar is 357.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
95
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 12 to 23
3.4
Fatigue Strength, MPa 280 to 350
76
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 380 to 400
200
Tensile Strength: Ultimate (UTS), MPa 600 to 670
350
Tensile Strength: Yield (Proof), MPa 390 to 560
300

Thermal Properties

Latent Heat of Fusion, J/g 250
500
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
620
Melting Onset (Solidus), °C 1420
560
Specific Heat Capacity, J/kg-K 470
910
Thermal Conductivity, W/m-K 39
150
Thermal Expansion, µm/m-K 13
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
39
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
140

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.5
Density, g/cm3 7.8
2.6
Embodied Carbon, kg CO2/kg material 1.5
8.0
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
11
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
620
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
53
Strength to Weight: Axial, points 21 to 24
38
Strength to Weight: Bending, points 20 to 22
43
Thermal Diffusivity, mm2/s 10
64
Thermal Shock Resistance, points 18 to 20
17

Alloy Composition

Aluminum (Al), % 0
91.3 to 93.1
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 96.5 to 97.7
0 to 0.15
Magnesium (Mg), % 0
0.45 to 0.6
Manganese (Mn), % 0.75 to 1.0
0 to 0.030
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
6.5 to 7.5
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.050
Residuals, % 0
0 to 0.15