7204-O Aluminum
7204-O aluminum is 7204 aluminum in the annealed condition. It has the lowest strength compared to the other variants of 7204 aluminum. The graph bars on the material properties cards below compare 7204-O aluminum to: 7000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
13 %
Fatigue Strength
130 MPa 18 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
130 MPa 19 x 103 psi
Tensile Strength: Ultimate (UTS)
220 MPa 31 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 18 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
210 °C 400 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
520 °C 970 °F
Specific Heat Capacity
880 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 86 BTU/h-ft-°F
Thermal Expansion
24 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
39 % IACS
Electrical Conductivity: Equal Weight (Specific)
120 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
8.4 kg CO2/kg material
Embodied Energy
150 MJ/kg 66 x 103 BTU/lb
Embodied Water
1140 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
25 MJ/m3
Resilience: Unit (Modulus of Resilience)
110 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
21 points
Strength to Weight: Bending
28 points
Thermal Diffusivity
58 mm2/s
Thermal Shock Resistance
9.4 points
Alloy Composition
| Al | 90.5 to 94.8 | |
| Zn | 4.0 to 5.0 | |
| Mg | 1.0 to 2.0 | |
| Mn | 0.2 to 0.7 | |
| Fe | 0 to 0.35 | |
| Si | 0 to 0.3 | |
| Cr | 0 to 0.3 | |
| Zr | 0 to 0.25 | |
| Ti | 0 to 0.2 | |
| Cu | 0 to 0.2 | |
| V | 0 to 0.1 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993
Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984
ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties