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7020 Aluminum vs. S44537 Stainless Steel

7020 aluminum belongs to the aluminum alloys classification, while S44537 stainless steel belongs to the iron alloys. There are 31 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 7020 aluminum and the bottom bar is S44537 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
180
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 8.4 to 14
21
Fatigue Strength, MPa 110 to 130
230
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
79
Shear Strength, MPa 110 to 230
320
Tensile Strength: Ultimate (UTS), MPa 190 to 390
510
Tensile Strength: Yield (Proof), MPa 120 to 310
360

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 210
1000
Melting Completion (Liquidus), °C 650
1480
Melting Onset (Solidus), °C 610
1430
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
19
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
3.4
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 1150
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
95
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
320
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18 to 37
18
Strength to Weight: Bending, points 25 to 41
18
Thermal Diffusivity, mm2/s 59
5.6
Thermal Shock Resistance, points 8.3 to 17
17

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0 to 0.1
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.35
20 to 24
Copper (Cu), % 0 to 0.2
0 to 0.5
Iron (Fe), % 0 to 0.4
69 to 78.6
Lanthanum (La), % 0
0.040 to 0.2
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0 to 0.8
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 0.35
0.1 to 0.6
Sulfur (S), % 0
0 to 0.0060
Titanium (Ti), % 0 to 0.25
0.020 to 0.2
Tungsten (W), % 0
1.0 to 3.0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0 to 0.15
0