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4145 Aluminum vs. N08031 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while N08031 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 4145 aluminum and the bottom bar is N08031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
210
Elongation at Break, % 2.2
45
Fatigue Strength, MPa 48
290
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
81
Shear Strength, MPa 69
510
Tensile Strength: Ultimate (UTS), MPa 120
730
Tensile Strength: Yield (Proof), MPa 68
310

Thermal Properties

Latent Heat of Fusion, J/g 540
310
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 590
1440
Melting Onset (Solidus), °C 520
1390
Specific Heat Capacity, J/kg-K 880
460
Thermal Conductivity, W/m-K 100
12
Thermal Expansion, µm/m-K 21
18

Otherwise Unclassified Properties

Base Metal Price, % relative 10
39
Density, g/cm3 2.8
8.1
Embodied Carbon, kg CO2/kg material 7.6
7.1
Embodied Energy, MJ/kg 140
96
Embodied Water, L/kg 1040
240

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
270
Resilience: Unit (Modulus of Resilience), kJ/m3 31
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
25
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 42
3.1
Thermal Shock Resistance, points 5.5
14

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.015
Chromium (Cr), % 0 to 0.15
26 to 28
Copper (Cu), % 3.3 to 4.7
1.0 to 1.4
Iron (Fe), % 0 to 0.8
29 to 36.9
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 0
30 to 32
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 9.3 to 10.7
0 to 0.3
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0