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SAE-AISI 8645 Steel vs. EN AC-45100 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while EN AC-45100 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 EN AC-45100 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
97 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 12 to 23
1.0 to 2.8
Fatigue Strength, MPa 280 to 350
82 to 99
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 600 to 670
300 to 360
Tensile Strength: Yield (Proof), MPa 390 to 560
210 to 320

Thermal Properties

Latent Heat of Fusion, J/g 250
470
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 470
890
Thermal Conductivity, W/m-K 39
140
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
30
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
95

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 1.5
7.9
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
3.5 to 7.6
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
290 to 710
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 21 to 24
30 to 35
Strength to Weight: Bending, points 20 to 22
35 to 39
Thermal Diffusivity, mm2/s 10
54
Thermal Shock Resistance, points 18 to 20
14 to 16

Alloy Composition

Aluminum (Al), % 0
88 to 92.8
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
2.6 to 3.6
Iron (Fe), % 96.5 to 97.7
0 to 0.6
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 0
0.15 to 0.45
Manganese (Mn), % 0.75 to 1.0
0 to 0.55
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0 to 0.1
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
4.5 to 6.0
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15