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7020 Aluminum vs. AISI 442 Stainless Steel

7020 aluminum belongs to the aluminum alloys classification, while AISI 442 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 AISI 442 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
190
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 8.4 to 14
23
Fatigue Strength, MPa 110 to 130
210
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
78
Shear Strength, MPa 110 to 230
370
Tensile Strength: Ultimate (UTS), MPa 190 to 390
580
Tensile Strength: Yield (Proof), MPa 120 to 310
310

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 210
960
Melting Completion (Liquidus), °C 650
1430
Melting Onset (Solidus), °C 610
1390
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
22
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.3
2.3
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1150
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
110
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18 to 37
21
Strength to Weight: Bending, points 25 to 41
20
Thermal Diffusivity, mm2/s 59
5.8
Thermal Shock Resistance, points 8.3 to 17
20

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0.1 to 0.35
18 to 23
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.4
74.1 to 82
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0 to 1.0
Nickel (Ni), % 0
0 to 0.6
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.35
0 to 1.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0 to 0.15
0