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SAE-AISI M3 Class 2 Steel vs. 4115 Aluminum

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while 4115 aluminum belongs to the aluminum alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 2 steel and the bottom bar is 4115 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
120 to 220

Thermal Properties

Latent Heat of Fusion, J/g 260
420
Melting Completion (Liquidus), °C 1620
640
Melting Onset (Solidus), °C 1570
590
Specific Heat Capacity, J/kg-K 440
900
Thermal Conductivity, W/m-K 26
160
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Base Metal Price, % relative 25
9.5
Density, g/cm3 8.3
2.7
Embodied Carbon, kg CO2/kg material 12
8.1
Embodied Energy, MJ/kg 180
150
Embodied Water, L/kg 110
1160

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
50
Strength to Weight: Axial, points 26 to 74
12 to 23
Strength to Weight: Bending, points 22 to 45
20 to 30
Thermal Diffusivity, mm2/s 7.2
66
Thermal Shock Resistance, points 24 to 69
5.2 to 9.9

Alloy Composition

Aluminum (Al), % 0
94.6 to 97.4
Carbon (C), % 1.2 to 1.3
0
Chromium (Cr), % 3.8 to 4.5
0
Copper (Cu), % 0 to 0.25
0.1 to 0.5
Iron (Fe), % 75.8 to 82.3
0 to 0.7
Magnesium (Mg), % 0
0.1 to 0.5
Manganese (Mn), % 0.15 to 0.4
0.6 to 1.2
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
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15

Comparable Variants