Aluminium, AMS
AMS 4342 T74511 Bar & Extrusion
High strength aerospace aluminium alloy with good resistance to stress-corrosion cracking.
Used in aircraft structural parts, aluminium alloy AMS 4342-7050 is an aerospace grade of aluminium combining high strength, stress corrosion cracking resistance and toughness.
It is particularly suited for heavy plate applications (3″ to 6″ thick) due to its lower quench sensitivity and retention of strength in thicker sections.
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4342 T74511 Aluminium Related Specifications
| System / Standard | Country / Region | Grade / Designation / Note |
| AA | USA | 4342-T74511 – non-standard / proprietary aluminium designation |
| EN / DIN | Europe | No standard EN AW grade published as “4342” in T74511 temper |
| UNS | International | No official UNS aluminium number assigned for 4342-T74511 |
| GB / JIS / BS | China / Japan / UK | No widely recognised aluminium equivalents under these systems |
Properties
Chemical Composition
Alloy 4342
SAE AMS 4342
| Chemical Element | % Present |
| Silicon (Si) | 0.00 - 0.12 |
| Iron (Fe) | 0.00 - 0.15 |
| Copper (Cu) | 2.00 - 2.60 |
| Manganese (Mn) | 0.00 - 0.10 |
| Magnesium (Mg) | 1.90 - 2.60 |
| Chromium (Cr) | 0.00 - 0.04 |
| Zinc (Zn) | 5.70 - 6.70 |
| Zirconium (Zr) | 0.08 - 0.15 |
| Titanium (Ti) | 0.00 - 0.06 |
| Other (Each) | 0.00 - 0.05 |
| Others (Total) | 0.00 - 0.15 |
| Aluminium (Al) | Balance |
Mechanical Properties
Bar
SAE AMS 4342
| Mechanical Property | Value |
| Proof Stress | 434 Min MPa |
| Tensile Strength | 503 Min MPa |
| Elongation A50 mm | 6 Min % |
Applications
- Aircraft structural parts
- Fuselage frames
- Bulkheads
- Wing skins
Characteristics
- High strength
- Good resistance to exfoliation and stress cracking
- Good fracture toughness & fatigue resistance
