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7003 Aluminum vs. AISI 420 Stainless Steel

7003 aluminum belongs to the aluminum alloys classification, while AISI 420 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 7003 aluminum and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 11
8.0 to 15
Fatigue Strength, MPa 130 to 150
220 to 670
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
76
Shear Strength, MPa 210 to 230
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 350 to 390
690 to 1720
Tensile Strength: Yield (Proof), MPa 300 to 310
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 380
280
Maximum Temperature: Mechanical, °C 200
620
Melting Completion (Liquidus), °C 630
1510
Melting Onset (Solidus), °C 510
1450
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 150
27
Thermal Expansion, µm/m-K 24
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
7.5
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.1
2.0
Embodied Energy, MJ/kg 150
28
Embodied Water, L/kg 1140
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 41
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 710
380 to 4410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 33 to 37
25 to 62
Strength to Weight: Bending, points 37 to 40
22 to 41
Thermal Diffusivity, mm2/s 59
7.3
Thermal Shock Resistance, points 15 to 17
25 to 62

Alloy Composition

Aluminum (Al), % 90.6 to 94.5
0
Carbon (C), % 0
0.15 to 0.4
Chromium (Cr), % 0 to 0.2
12 to 14
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.35
82.3 to 87.9
Magnesium (Mg), % 0.5 to 1.0
0
Manganese (Mn), % 0 to 0.3
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.0 to 6.5
0
Zirconium (Zr), % 0.050 to 0.25
0
Residuals, % 0 to 0.15
0