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SAE-AISI M3 Class 1 Steel vs. 6018 Aluminum

SAE-AISI M3 class 1 steel belongs to the iron alloys classification, while 6018 aluminum belongs to the aluminum alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, 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 M3 class 1 steel and the bottom bar is 6018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
290 to 300

Thermal Properties

Latent Heat of Fusion, J/g 260
400
Melting Completion (Liquidus), °C 1610
640
Melting Onset (Solidus), °C 1570
570
Specific Heat Capacity, J/kg-K 440
890
Thermal Conductivity, W/m-K 26
170
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Base Metal Price, % relative 25
10
Density, g/cm3 8.3
2.9
Embodied Carbon, kg CO2/kg material 10
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 100
1180

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
48
Strength to Weight: Axial, points 26 to 72
28 to 29
Strength to Weight: Bending, points 22 to 44
34 to 35
Thermal Diffusivity, mm2/s 7.2
65
Thermal Shock Resistance, points 24 to 67
13

Alloy Composition

Aluminum (Al), % 0
93.1 to 97.8
Bismuth (Bi), % 0
0.4 to 0.7
Carbon (C), % 1.0 to 1.1
0
Chromium (Cr), % 3.8 to 4.5
0 to 0.1
Copper (Cu), % 0 to 0.25
0.15 to 0.4
Iron (Fe), % 76.9 to 82.9
0 to 0.7
Lead (Pb), % 0
0.4 to 1.2
Magnesium (Mg), % 0
0.6 to 1.2
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.8
Molybdenum (Mo), % 4.8 to 6.5
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0.5 to 1.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.3 to 2.8
0
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15