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7020 Aluminum vs. S40945 Stainless Steel

7020 aluminum belongs to the aluminum alloys classification, while S40945 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 S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
160
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 8.4 to 14
25
Fatigue Strength, MPa 110 to 130
160
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
75
Shear Strength, MPa 110 to 230
270
Tensile Strength: Ultimate (UTS), MPa 190 to 390
430
Tensile Strength: Yield (Proof), MPa 120 to 310
230

Thermal Properties

Latent Heat of Fusion, J/g 380
270
Maximum Temperature: Mechanical, °C 210
710
Melting Completion (Liquidus), °C 650
1450
Melting Onset (Solidus), °C 610
1410
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
26
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
8.0
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1150
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
89
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18 to 37
15
Strength to Weight: Bending, points 25 to 41
16
Thermal Diffusivity, mm2/s 59
6.9
Thermal Shock Resistance, points 8.3 to 17
15

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.35
10.5 to 11.7
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.4
85.1 to 89.3
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.35
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.25
0.050 to 0.2
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0 to 0.15
0