When it comes to enhancing the properties of steel alloys, AMS 7222 is the right material to consider. This steel alloy offers excellent mechanical and physical properties, making it a perfect choice for various industrial applications. This article will closely examine AMS 7222’s composition, physical and mechanical properties, hardness, and heat treatment methods.
What is AMS 7222?
AMS 7222 (also known as 2117 Aluminum Alloy) is a specification created for use in the aerospace industry. This specification outlines the requirements for producing high-strength aluminium alloys for manufacturing aviation parts and components. The AMS 7222 materials are specifically designed to be strong, durable and resistant to wear and tear, making them ideal for use in aircraft parts that are exposed to extreme conditions while flying. With AMS 7222 materials, manufacturers can produce lightweight but strong aviation parts that ensure safe and efficient flying for all passengers.
AMS 7222 Composition
AMS 7222 is a steel alloy with low carbon content and high hardenability. It falls under the aircraft-quality category and is suitable for high-stress applications requiring wear and tear resistance. AMS 7222 includes carbon, manganese, chromium, molybdenum, and vanadium. These alloying elements enhance the material’s hardness, strength, toughness, and resistance to corrosion, making it ideal for use in high-stress environments.
| Element | Content (%) |
|---|---|
| Aluminum, Al | 94.3 – 97.6 |
| Copper, Cu | 2.2 – 3 |
| Silicon, Si | ≤ 0.80 |
| Iron, Fe | ≤ 0.70 |
| Zinc, Zn | ≤ 0.25 |
| Magnesium, Mg | 0.20 – 0.50 |
| Manganese, Mn | ≤ 0.20 |
| Chromium, Cr | ≤ 0.10 |
| Other (each) | ≤ 0.050 |
| Other (total) | ≤ 0.15 |
AMS 7222 Physical Properties
Regarding physical properties, AMS 7222 has a density of 7.85 g/cm³ and a melting point of 1450°C. This material offers good weldability and machinability, and it can be hot and cold worked to achieve the desired shape and size. This makes it useful for various applications such as aircraft structural components, hydraulic and fuel piping systems, and engine parts.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 2.75 g/cm³ | 0.0994 lb/in³ |
| Melting point | 554 – 649°C | 1030 – 1200°F |
AMS 7222 Mechanical Properties
Mechanical properties are essential when choosing materials for demanding applications. AMS 7222 exhibits high tensile strength, yield strength, and impact resistance. It offers excellent fatigue strength, making it suitable for aircraft landing gears, propeller shafts, and fastener components. The high toughness and durability make it an ideal material for high-performance applications requiring wear and erosion resistance.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 296 MPa | 43000 psi |
| Yield strength | 165 MPa | 24000 psi |
| Elongation at break (@diameter 12.7 mm/0.500 in) | 27% | 27% |
| Poisson’s ratio | 0.33 | 0.33 |
| Elastic modulus | 71 GPa | 10300 ksi |
| Shear strength | 193 MPa | 28000 psi |
| Hardness, Brinell (@load 500 kg; thickness 10.0 mm) | 70 | 70 |
| Hardness, Knoop (converted from Brinell hardness value) | 93 | 93 |
| Hardness, Vickers (converted from Brinell hardness value) | 81 | 81 |
| Machinability | 50 | 50 |
AMS 7222 Equivalents
- AMS 7222
- ASTM B316
- QQ A-430
- SAE J454
AMS 7222 Uses
The uses of AMS 7222 are diverse and varied. This material is used extensively in the aerospace and aviation industry to manufacture aircraft parts like landing gears and hydraulic systems. It is also useful in the automotive industry to produce high-performance engine components, turbocharger rotors, and bearings. Other uses include manufacturing pumps, valves, and compressors in the oil and gas industry.
AMS 7222 Hardness
The hardness of AMS 7222 is dependent on the heat treatment method used. The commonly used methods include quenching and tempering, austempering, and normalizing. These heat treatments are carried out to achieve specific hardness, durability, and wear resistance properties. AMS 7222 offers excellent hardness and resistance to deformation, making it suitable for high-end engineering applications.
Conclusion:
In summary, AMS 7222 is an excellent steel alloy with fantastic mechanical and physical properties. Its composition, physical and mechanical properties, uses, hardness and heat treatment methods make it an ideal material for high-performance applications in demanding environments. Whether you are in the aerospace, automotive, or oil and gas industry, AMS 7222 is an excellent choice to enhance your applications.
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