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SAE-AISI 5140 Steel vs. C355.0 Aluminum

SAE-AISI 5140 steel belongs to the iron alloys classification, while C355.0 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 5140 steel and the bottom bar is C355.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 290
86 to 90
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 12 to 29
2.7 to 3.8
Fatigue Strength, MPa 220 to 570
76 to 84
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Tensile Strength: Ultimate (UTS), MPa 560 to 970
290 to 310
Tensile Strength: Yield (Proof), MPa 290 to 840
200 to 230

Thermal Properties

Latent Heat of Fusion, J/g 250
470
Maximum Temperature: Mechanical, °C 420
170
Melting Completion (Liquidus), °C 1460
620
Melting Onset (Solidus), °C 1420
570
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 45
150
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
39
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
130

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 1.4
8.0
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 49
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 180
7.5 to 9.8
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1880
290 to 380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
51
Strength to Weight: Axial, points 20 to 34
30 to 32
Strength to Weight: Bending, points 19 to 28
36 to 37
Thermal Diffusivity, mm2/s 12
60
Thermal Shock Resistance, points 16 to 29
13 to 14

Alloy Composition

Aluminum (Al), % 0
91.7 to 94.1
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.7 to 0.9
0
Copper (Cu), % 0
1.0 to 1.5
Iron (Fe), % 97.3 to 98.1
0 to 0.2
Magnesium (Mg), % 0
0.4 to 0.6
Manganese (Mn), % 0.7 to 0.9
0 to 0.1
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
4.5 to 5.5
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15