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SAE-AISI 8740 Steel vs. 1200 Aluminum

SAE-AISI 8740 steel belongs to the iron alloys classification, while 1200 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 8740 steel and the bottom bar is 1200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
23 to 48
Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 11 to 23
1.1 to 28
Fatigue Strength, MPa 270 to 350
25 to 69
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 370 to 400
54 to 100
Tensile Strength: Ultimate (UTS), MPa 580 to 670
85 to 180
Tensile Strength: Yield (Proof), MPa 380 to 570
28 to 160

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
660
Melting Onset (Solidus), °C 1420
650
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39
230
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
58
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
190

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.0
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 1.5
8.2
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
2.0 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
5.7 to 180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 20 to 24
8.7 to 19
Strength to Weight: Bending, points 20 to 22
16 to 26
Thermal Diffusivity, mm2/s 10
92
Thermal Shock Resistance, points 17 to 20
3.8 to 8.1

Alloy Composition

Aluminum (Al), % 0
99 to 100
Carbon (C), % 0.38 to 0.43
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 1.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.050
Molybdenum (Mo), % 0.2 to 0.3
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 1.0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.050
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15

Comparable Variants