Alloy AMS 5655 is a precipitation-hardenable martensitic stainless steel widely used in the aerospace, defence, and oil and gas industries. The steel is known for its strength, toughness, and corrosion resistance. In this blog post, we will explore the composition, physical and mechanical properties, uses, and heat treatment of AMS5655.
What is AMS 5655?
AMS 5655 (also known as Stainless Steel 422) is a popular material within the aerospace and defence industries that boasts impressive mechanical properties, such as high strength, toughness, and corrosion resistance. This precipitation-hardening stainless steel alloy is well-suited for critical applications requiring reliable, long-lasting performance in extreme environments. In addition, AMS5655 is known for its excellent weldability, which makes it a go-to choice for precision parts and components in complex systems. Whether you’re designing aircraft engines or missile systems, AMS 5655 offers the strength and durability needed to ensure your products perform flawlessly in challenging conditions.
AMS 5655 Composition
AMS 5655 is a steel alloy that combines iron, nickel, chromium, molybdenum, and titanium. These elements combine to give the steel unique properties, including exceptional strength and corrosion resistance. The steel also contains small amounts of carbon and manganese, which help to improve its hardness and toughness.
| Element | Content (%) |
|---|---|
| Iron, Fe | ~ 82 |
| Chromium, Cr | 11.0-13.0 |
| Manganese, Mn | 1.00 |
| Nickel, Ni | 0.5-1.0 |
| Molybdenum, Mo | 0.75-1.25 |
| Tungsten, W | 0.75-1.25 |
| Silicon, Si | 0.75 |
| Carbon, C | 0.20-0.25 |
| Vanadium, V | 0.15-0.3 |
| Phosphorous, P | 0.025 |
| Sulfur, S | 0.025 |
AMS 5655 Physical Properties
AMS 5655 has a density of 7.85 g/cm3 and a melting point of 1370-1400°C. The steel exhibits excellent corrosion resistance in both annealed and precipitation-hardened conditions. Its magnetic permeability is low and has a thermal expansion coefficient similar to austenitic stainless steel.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm3 | 0.2817 lb/in³ |
AMS 5655 Mechanical Properties
AMS 5655 is known for its exceptional strength, toughness, and ductility combination. Its yield strength ranges from 1034 to 1380 MPa depending on the heat treatment conditions. The steel also has high ultimate tensile strength, ranging from 1380 to 1655 MPa. Its elongation at break is typically 14-25%.
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 27557–30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
AMS 5655 Uses
AMS 5655 is used in many applications requiring high strength, toughness, and corrosion resistance. It is used in aircraft landing gear, engine components, and fasteners in the aerospace industry. In the oil and gas industry, it is used for drilling components, valves, and pumps. Steel is also used in defence applications, such as armoured vehicles, tanks, and missile components.
AMS 5655 Hardness
AMS 5655 varies depending on the heat treatment condition. In the annealed condition, the maximum hardness is typically around 25 HRC. The hardness can be increased with precipitation hardening to 45-50 HRC. The steel is known for its excellent combination of high hardness and toughness.
AMS 5655 Heat treatment
AMS 5655 can be heat treated to achieve the desired combination of strength, toughness, and hardness. The heat treatment process typically involves annealing, followed by precipitation hardening. The steel is heated to a specific temperature and then cooled rapidly to form martensite, which is then aged to achieve the desired properties.
Conclusion
AMS 5655 material is a precipitation-hardenable martensitic stainless steel widely used in applications requiring high strength, toughness, and corrosion resistance. Its unique combination of properties makes it an ideal material for use in the aerospace, defence, and oil and gas industries. The steel can be heat treated to achieve the desired properties, including high hardness and toughness. Overall, AMS 5655 is a versatile and reliable steel alloy essential in many critical applications.
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