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4145 Aluminum vs. N08020 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while N08020 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 N08020 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
15 to 34
Fatigue Strength, MPa 48
210 to 240
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
380 to 410
Tensile Strength: Ultimate (UTS), MPa 120
610 to 620
Tensile Strength: Yield (Proof), MPa 68
270 to 420

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 590
1410
Melting Onset (Solidus), °C 520
1360
Specific Heat Capacity, J/kg-K 880
460
Thermal Conductivity, W/m-K 100
12
Thermal Expansion, µm/m-K 21
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 84
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 10
38
Density, g/cm3 2.8
8.2
Embodied Carbon, kg CO2/kg material 7.6
6.6
Embodied Energy, MJ/kg 140
92
Embodied Water, L/kg 1040
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
83 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 31
180 to 440
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
21
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 42
3.2
Thermal Shock Resistance, points 5.5
15

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0 to 0.15
19 to 21
Copper (Cu), % 3.3 to 4.7
3.0 to 4.0
Iron (Fe), % 0 to 0.8
29.9 to 44
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
32 to 38
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.035
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0