Definition
AMS 6440 is a material specification for alloy steel used in highly stressed applications in the aerospace and defense industries. It corresponds to 4340 steel, known for its high strength, toughness, and excellent fatigue resistance after heat treatment.
Features
- High strength and hardness after quenching and tempering
- Excellent toughness under dynamic loading conditions
- High resistance to material fatigue
- Good hardenability even in larger cross-sections
- Stable mechanical properties across a wide temperature range
- Suitable for precision machining in the annealed condition
- Ability to achieve high mechanical performance tailored to application requirements
Applications
- Aerospace structural components
- Shafts, gears, and fasteners
- Aircraft landing gear components
- Highly loaded mechanical parts
- Aerospace and defense industries
- Applications requiring high strength and reliability
Conclusion
AMS 6440 is a key material in aerospace applications where the combination of strength, toughness, and fatigue resistance is critical for safe and long-term operation.
