ThePipingMart Blog Grades AMS 5549 Stainless Steel – Composition, Properties, and Uses

AMS 5549 Stainless Steel – Composition, Properties, and Uses

AMS 5549

AMS 5549 is a high-strength, corrosion-resistant steel sheet, strip, and plate widely used in the aerospace and defence industry. It is a material that has undergone rigorous testing and meets the standards set by the SAE (Society of Automotive Engineers) for high-strength steel. In this blog, we will discuss the composition, physical and mechanical properties, uses, hardness, and heat treatment of AMS 5549 to give you a comprehensive understanding.

What is AMS 5549?

AMS 5549, (also known as 355 Stainless Steel) also known as Alloy 355, is a type of stainless steel that has become increasingly popular due to its versatility and strength. Made with nickel, chromium, and molybdenum, this alloy is highly corrosion-resistant, making it ideal for use in harsh environments such as the aerospace and industrial sectors. Its mechanical properties, such as strength and flexibility, make it one of the best choices for high-performance applications. Whether you are looking for a durable metal for powertrain and turbine engine components or marine and chemical processing equipment material, AMS5549 is a top choice to help you meet your needs.

AMS 5549 Composition

AMS 5549 is composed mainly of iron, with a high percentage of chromium, nickel, and molybdenum. These elements give it excellent resistance to corrosion, oxidation, and erosion at high temperatures. The material also contains small amounts of carbon, manganese, silicon, sulfur, and phosphorus. Its chemical composition is tightly controlled to ensure consistent quality.

Chemical Composition 
Weight% C P Si Ni N Mn S Cr Mo Fe
AM 355 0.10 – 0.15 0.040 max 0.50 max 4 -5 0.07 – 0.13 0.50-1.25 0.030 max 15-16 2.5-3.25 Bal

AMS 5549 Physical Properties

AMS 5549 has excellent physical properties that make it suitable for harsh environments. It has a density of 7.85 g/cm3, a specific heat of 500 J/kgK, and a thermal expansion of 11.2 µm/m°C. It can withstand temperatures up to 760°C without experiencing significant deformation or failure.

Properties Metric Imperial
Density 7.7 – 8.03 g/cm3 0.278 – 0.290 lb/in³

AMS 5549 Mechanical Properties

AMS 5549 sheet has exceptional strength and toughness properties, making it ideal for high-stress applications. It has a tensile strength of 120 ksi (827 MPa), yield strength of 70 ksi (483 MPa), and an elongation of 20%. It also has a high fatigue strength, which allows it to withstand repeated loading cycles without developing cracks or fractures.

Properties Metric Imperial
Elastic Modulus 190 – 210 GPa 27557 – 30458 ksi
Poisson’s Ratio 0.27 – 0.30 0.27 – 0.30

AMS 5549 Equivalent

  • AISI 634
  • AMS 5547
  • AMS 5743
  • AMS 5744
  • ASTM A564
  • ASTM A579
  • ASTM A693
  • ASTM A705
  • MIL S-8840
  • UNS S35500

AMS 5549 Uses

AMS 5549 is commonly used for structural and engine components in the aerospace and defence industry. It is used in constructing aircraft engines, gas turbines, and rocket engines due to its excellent corrosion resistance, high strength, and capability to withstand high temperatures. It is also used in heat exchangers, chemical processing equipment, and nuclear reactors.

AMS 5549 Hardness

AMS 5549 has a hardness range between 36 and 41 HRC (Rockwell hardness scale). This hardness level makes it ideal for wear resistance, fatigue, and deformation applications. It is also easy to machine, allowing for the production of complex parts with tight tolerances.

AMS 5549 Heat Treatment

AMS 5549 can be heat-treated to improve strength, toughness, and overall performance. The material can be annealed, solution treated, and aged to achieve desired properties. This process involves heating the material to a specific temperature, holding it for a specific period, and then slowly cooling it. The heat treatment process can significantly alter the performance of AMS 5549, making it suitable for various applications.


AMS 5549 material is a high-strength, corrosion-resistant steel sheet, strip, and plate ideal for harsh environments. Its chemical composition, physical properties, mechanical properties, uses, and heat treatment makes it an ideal material for the aerospace and defence industry. Its excellent strength, toughness, and resistance to corrosion and wear make it a popular choice for various applications. When considering materials for high-stress applications, consider the benefits of AMS 5549.

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