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4047 Aluminum vs. S40920 Stainless Steel

4047 aluminum belongs to the aluminum alloys classification, while S40920 stainless steel belongs to the iron alloys. There are 30 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 4047 aluminum and the bottom bar is S40920 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
190
Elongation at Break, % 3.4
22
Fatigue Strength, MPa 45
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 69
270
Tensile Strength: Ultimate (UTS), MPa 120
430
Tensile Strength: Yield (Proof), MPa 64
190

Thermal Properties

Latent Heat of Fusion, J/g 570
270
Maximum Temperature: Mechanical, °C 160
710
Melting Completion (Liquidus), °C 580
1450
Melting Onset (Solidus), °C 580
1400
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 130
26
Thermal Expansion, µm/m-K 21
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
6.5
Density, g/cm3 2.5
7.7
Embodied Carbon, kg CO2/kg material 7.7
2.0
Embodied Energy, MJ/kg 140
28
Embodied Water, L/kg 1050
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.5
78
Resilience: Unit (Modulus of Resilience), kJ/m3 28
97
Stiffness to Weight: Axial, points 16
14
Stiffness to Weight: Bending, points 55
25
Strength to Weight: Axial, points 13
15
Strength to Weight: Bending, points 21
16
Thermal Diffusivity, mm2/s 59
6.9
Thermal Shock Resistance, points 5.6
15

Alloy Composition

Aluminum (Al), % 85.3 to 89
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 0 to 0.8
85.1 to 89.4
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 11 to 13
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0.15 to 0.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0