AMS 6411 Alloy Steel – Composition, Properties, and Uses
Are you familiar with AMS 6411? If you’re working in the aerospace industry or any field that involves high-stress applications, knowing AMS 6411 is essential. This alloy steel is designed to withstand extreme conditions and can provide excellent strength, toughness, and wear resistance. This blog post will explore AMS 6411’s composition, physical and mechanical properties, and uses. So, let’s delve deeper into the world of AMS 6411.
What is AMS 6411?
AMS 6411 (also known as Alloy Steel 4330) is a medium carbon low alloy steel widely used for critical aerospace applications such as landing gear, engine mounts, and other high-stress applications. This alloy steel is known for its high strength, toughness, and wear resistance. It is similar to 4340 steel but with better fracture toughness and lower susceptibility to hydrogen embrittlement.
AMS 6411 Composition
AMS 6411 comprises iron, carbon, chromium, nickel, molybdenum, and vanadium. The alloying elements in AMS6411 enhance its strength, toughness, and hardness. The carbon content ranges from 0.38% to 0.43%, while the other alloying elements are added in specific amounts to achieve the desired mechanical and physical properties.
| Element | Content (%) |
|---|---|
| Iron, Fe | 95.3-98.1 |
| Nickel, Ni | 1.0-1.50 |
| Manganese, Mn | ≤ 1.0 |
| Silicon, Si | ≤ 0.80 |
| Chromium, Cr | 0.40-0.60 |
| Molybdenum, Mo | 0.30-0.50 |
| Carbon, C | 0.20-0.30 |
AMS 6411 Physical Properties
The physical properties of AMS 6411 include a density of 7.85 g/cm³, a melting point of 1427°C, and a thermal conductivity of 42.5 W/mK. This alloy steel also has a coefficient of thermal expansion of 12.3 µm/m°C, which is relatively low. The electrical conductivity of AMS 6411 is 2.19 × 10^6 S/m.
| Properties | Metric | Imperial |
|---|---|---|
| Melting point | 1427°C | 2600°F |
AMS 6411 Mechanical Properties
AMS 6411 has impressive mechanical properties, making it ideal for high-stress applications. It has a yield strength of 960 MPa, tensile strength of 1170 MPa, and an elongation of 10%. The alloy steel also has good fatigue and impact resistance, making it ideal for critical aerospace applications.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | ≥ 860 MPa | ≥ 125000 psi |
| Yield strength | ≥ 690 MPa | ≥ 100000 psi |
| Elongation at break (In 50 mm) | ≥ 15.0 % | ≥ 15.0 % |
| Hardness, Brinell | 285 | 285 |
AMS 6411 Uses
AMS 6411 sheet has many uses in high-stress applications that require strength, toughness, and wear resistance. It is commonly used in landing gear components, engine mounts, and other critical aerospace applications. The alloy steel also manufactures heavy-duty shafts, gears, and axles.
AMS 6411 Hardness and Heat Treatment
AMS 6411 has a hardness range of 261-321 HB (Brinell hardness). It can be heat-treated to achieve higher hardness levels, improved toughness, and better wear resistance. The most common heat treatment processes for AMS 6411 include quenching and tempering, annealing, and normalizing.
Conclusion:
In summary, AMS 6411 material is a medium carbon low alloy steel with impressive strength, toughness and wear resistance. Its composition and physical and mechanical properties make it ideal for high-stress applications such as landing gear, engine mounts, and other critical aerospace applications. Understanding the properties of AMS 6411 can help designers and engineers make informed decisions on using this alloy steel.
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