Aluminium, ASTM & FED-QQ
QQ-A-200/11 T73 Bar & Extrusion
Very high strength aerospace aluminium alloy.
A very high strength aerospace aluminium alloy with, depending upon temper, yield strength of 24-68 ksi (165 – 465 MPa) and tensile strength of 40-78 ksi (275 – 540 MPa).
This alloy is used where high strength is required and where good resistance to general corrosion is NOT important.
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QQ-A-200/11 T73 Aluminium Related Specifications
| System / Standard | Country / Region | Grade / Designation |
| AA | USA | 7075-T73 |
| UNS | International | A97075 (7075-T73) |
| EN / DIN | Europe | EN AW-7075-T73 / 3.4365 |
| EN Name | Europe | AlZn5.5MgCu-T73 |
| ASTM B221 | USA | 7075-T73 extruded bar, rod, shapes & tube |
| BS (Aerospace) | UK | L95 (7075 extruded alloy, T73 where specified) |
| AFNOR | France | A-Z5GU-T73 |
Properties
Chemical Composition
Alloy QQ A 200/11
SAE AMS QQ-A-200/11
| Chemical Element | % Present |
| Silicon (Si) | 0.00 - 0.40 |
| Iron (Fe) | 0.00 - 0.50 |
| Copper (Cu) | 1.20 - 2.00 |
| Manganese (Mn) | 0.00 - 0.30 |
| Chromium (Cr) | 0.18 - 0.28 |
| Magnesium (Mg) | 2.10 - 2.90 |
| Zinc (Zn) | 5.10 - 6.10 |
| Titanium (Ti) | 0.00 - 0.20 |
| Other (Each) | 0.00 - 0.05 |
| Others (Total) | 0.00 - 0.15 |
| Aluminium (Al) | Balance |
General Physical Properties
| Physical Property | Value |
| Density | 2.81 g/cm³ |
| Melting Point | 635 °C |
| Thermal Expansion | 23.5 x 10-6/K |
| Modulus of Elasticity | 72 GPa |
| Thermal Conductivity | 134-160 W/m.K |
| Electrical Resistivity | 40 % IACS |
Applications
- Aerospace components
- High technology applications
- Defence components
Characteristics
- High strength
- Very good machinability
- Weldable using resistancce, spot & beam methods
- Poor resistance to atmospheric corrosion
Additional Information
Mechanical Properties
These mechanical properties are for bar in the T73 temper.
| Diameter (mm) | Proof Strength (Min) | Tensile Strength (Min) | Elongation % (Min) |
| Up to & incl. 6.3 | 400 | 469 | 7 |
| Over 6.3 up to & incl. 38 | 420 | 483 | 8 |
| Over 38 up to & incl. 76.2 | 407 | 476 | 8 |
| Over 76.2 up to & incl. 114 | 393 | 469 | 7 |
