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SAE-AISI 5155 Steel vs. EN AC-45100 Aluminum

SAE-AISI 5155 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 5155 steel and the bottom bar is EN AC-45100 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
97 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 21
1.0 to 2.8
Fatigue Strength, MPa 260
82 to 99
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 620
300 to 360
Tensile Strength: Yield (Proof), MPa 380
210 to 320

Thermal Properties

Latent Heat of Fusion, J/g 250
470
Maximum Temperature: Mechanical, °C 420
170
Melting Completion (Liquidus), °C 1450
630
Melting Onset (Solidus), °C 1410
550
Specific Heat Capacity, J/kg-K 470
890
Thermal Conductivity, W/m-K 49
140
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
30
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
95

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 1.4
7.9
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 49
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
3.5 to 7.6
Resilience: Unit (Modulus of Resilience), kJ/m3 380
290 to 710
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 22
30 to 35
Strength to Weight: Bending, points 21
35 to 39
Thermal Diffusivity, mm2/s 13
54
Thermal Shock Resistance, points 20
14 to 16

Alloy Composition

Aluminum (Al), % 0
88 to 92.8
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.7 to 0.9
0
Copper (Cu), % 0
2.6 to 3.6
Iron (Fe), % 97.2 to 97.9
0 to 0.6
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 0
0.15 to 0.45
Manganese (Mn), % 0.7 to 0.9
0 to 0.55
Nickel (Ni), % 0
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