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SAE-AISI 8645 Steel vs. 3203 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 3203 aluminum belongs to the aluminum 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 SAE-AISI 8645 steel and the bottom bar is 3203 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 12 to 23
4.5 to 29
Fatigue Strength, MPa 280 to 350
46 to 92
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 380 to 400
72 to 120
Tensile Strength: Ultimate (UTS), MPa 600 to 670
110 to 200
Tensile Strength: Yield (Proof), MPa 390 to 560
39 to 190

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 410
180
Melting Completion (Liquidus), °C 1460
650
Melting Onset (Solidus), °C 1420
620
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39
170
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
43
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
140

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.0
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 1.5
8.1
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
8.0 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
11 to 250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 21 to 24
11 to 20
Strength to Weight: Bending, points 20 to 22
19 to 28
Thermal Diffusivity, mm2/s 10
70
Thermal Shock Resistance, points 18 to 20
4.9 to 8.8

Alloy Composition

Aluminum (Al), % 0
96.9 to 99
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 0.7
Manganese (Mn), % 0.75 to 1.0
1.0 to 1.5
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
0 to 0.6
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15

Comparable Variants