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7050 Aluminum vs. AISI 304 Stainless Steel

7050 aluminum belongs to the aluminum alloys classification, while AISI 304 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 7050 aluminum and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 2.2 to 12
8.0 to 43
Fatigue Strength, MPa 130 to 210
210 to 440
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 280 to 330
400 to 690
Tensile Strength: Ultimate (UTS), MPa 490 to 570
580 to 1180
Tensile Strength: Yield (Proof), MPa 390 to 500
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 190
710
Melting Completion (Liquidus), °C 630
1450
Melting Onset (Solidus), °C 490
1400
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 140
16
Thermal Expansion, µm/m-K 24
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1120
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 10 to 55
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 1110 to 1760
140 to 1870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 45 to 51
21 to 42
Strength to Weight: Bending, points 45 to 50
20 to 32
Thermal Diffusivity, mm2/s 54
4.2
Thermal Shock Resistance, points 21 to 25
12 to 25

Alloy Composition

Aluminum (Al), % 87.3 to 92.1
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.040
18 to 20
Copper (Cu), % 2.0 to 2.6
0
Iron (Fe), % 0 to 0.15
66.5 to 74
Magnesium (Mg), % 1.9 to 2.6
0
Manganese (Mn), % 0 to 0.1
0 to 2.0
Nickel (Ni), % 0
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.12
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.060
0
Zinc (Zn), % 5.7 to 6.7
0
Zirconium (Zr), % 0.080 to 0.15
0
Residuals, % 0 to 0.15
0