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7003 Aluminum vs. S21900 Stainless Steel

7003 aluminum belongs to the aluminum alloys classification, while S21900 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 S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 11
50
Fatigue Strength, MPa 130 to 150
380
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 210 to 230
510
Tensile Strength: Ultimate (UTS), MPa 350 to 390
710
Tensile Strength: Yield (Proof), MPa 300 to 310
390

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 200
980
Melting Completion (Liquidus), °C 630
1400
Melting Onset (Solidus), °C 510
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 150
14
Thermal Expansion, µm/m-K 24
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1140
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 41
300
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 710
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 33 to 37
26
Strength to Weight: Bending, points 37 to 40
23
Thermal Diffusivity, mm2/s 59
3.8
Thermal Shock Resistance, points 15 to 17
15

Alloy Composition

Aluminum (Al), % 90.6 to 94.5
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.2
19 to 21.5
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.35
59.4 to 67.4
Magnesium (Mg), % 0.5 to 1.0
0
Manganese (Mn), % 0 to 0.3
8.0 to 10
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
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