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SAE-AISI 4161 Steel vs. 242.0 Aluminum

SAE-AISI 4161 steel belongs to the iron alloys classification, while 242.0 aluminum belongs to the aluminum alloys. There are 31 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 4161 steel and the bottom bar is 242.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
70 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
73
Elongation at Break, % 20
0.5 to 1.5
Fatigue Strength, MPa 290
55 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 420
150 to 240
Tensile Strength: Ultimate (UTS), MPa 680
180 to 290
Tensile Strength: Yield (Proof), MPa 410
120 to 220

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 420
210
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
530
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 43
130 to 170
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
33 to 44
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
96 to 130

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
12
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
1.3 to 3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 460
110 to 340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 24
16 to 26
Strength to Weight: Bending, points 22
23 to 32
Thermal Diffusivity, mm2/s 12
50 to 62
Thermal Shock Resistance, points 22
8.0 to 13

Alloy Composition

Aluminum (Al), % 0
88.4 to 93.6
Carbon (C), % 0.56 to 0.64
0
Chromium (Cr), % 0.7 to 0.9
0 to 0.25
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 96.7 to 97.6
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0.75 to 1.0
0 to 0.35
Molybdenum (Mo), % 0.25 to 0.35
0
Nickel (Ni), % 0
1.7 to 2.3
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.7
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.35
Residuals, % 0
0 to 0.15