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SAE-AISI 8645 Steel vs. 360.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 360.0 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 360.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
75
Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 12 to 23
2.5
Fatigue Strength, MPa 280 to 350
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 380 to 400
190
Tensile Strength: Ultimate (UTS), MPa 600 to 670
300
Tensile Strength: Yield (Proof), MPa 390 to 560
170

Thermal Properties

Latent Heat of Fusion, J/g 250
530
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
590
Melting Onset (Solidus), °C 1420
570
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39
130
Thermal Expansion, µm/m-K 13
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
34
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
110

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
7.8
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 50
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
6.4
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
200
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
53
Strength to Weight: Axial, points 21 to 24
32
Strength to Weight: Bending, points 20 to 22
38
Thermal Diffusivity, mm2/s 10
55
Thermal Shock Resistance, points 18 to 20
14

Alloy Composition

Aluminum (Al), % 0
85.1 to 90.6
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
0 to 0.6
Iron (Fe), % 96.5 to 97.7
0 to 2.0
Magnesium (Mg), % 0
0.4 to 0.6
Manganese (Mn), % 0.75 to 1.0
0 to 0.35
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0 to 0.5
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
9.0 to 10
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.5
Residuals, % 0
0 to 0.25