ThePipingMart Blog Grades AMS 5571 Stainless Steel – Composition, Properties, and Uses

AMS 5571 Stainless Steel – Composition, Properties, and Uses

AMS 5571

AMS5571 is a high-quality stainless steel alloy with impeccable corrosion resistance in seawater and other harsh environments. It is a cold-drawn and precipitation-hardened alloy widely used in the aerospace, automotive, and marine industries. With its excellent strength, flexibility, and machinability properties, it’s no surprise that AMS 5571 is popular among manufacturers in these industries. In this blog post, we’ll dive into the composition, physical and mechanical properties, and the uses and hardness of AMS 5571.

What is AMS 5571?

AMS5571 (also known as 347 Stainless Steel) is an aerospace specification for precipitation hardenable cobalt-nickel-chromium-molybdenum alloy. It offers excellent mechanical and corrosion-resistant properties, making it ideal for use in aircraft components.

What Form Is AMS 5571 Available at Piping Mart?

  • Nut
  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Channels
  • ERW Pipes
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings
  • Forged Fitting
  • Instrumentation Fittings

AMS 5571 Composition

AMS 5571 is a type of stainless steel that is comprised of several key elements. This alloy contains high levels of chromium, nickel, and molybdenum. The presence of high levels of these elements is what gives AMS 5571 its superior corrosion resistance properties. Additionally, this alloy has a very low carbon content, which allows it to maintain excellent weldability.

Element 347
Carbon 0.08
Chromium 17.0-19.0
Nickel 9.0-13.0
Manganese 2.00
Silicon 0.75
Phosphorus 0.045
Sulfur 0.030
Niobium 10 x C min / 1.00 max

AMS 5571 Physical Properties

AMS 5571 has excellent physical properties, making it a popular choice in aerospace, automotive, and marine manufacturing components. This alloy has a density of 7.9 g/cm3, a melting point of 1399 °C, and a thermal expansion coefficient of 17 x 10^-6/°C. With these physical properties, AMS 5571 is highly resistant to high-temperature oxidation and thermal shock.

Physical Properties
Density ( ) 7.93
Melting point (°C ) 1300-1425

AMS 5571 Mechanical Properties

Aside from its exceptional physical properties, AMS 5571 also boasts excellent mechanical properties. Its tensile strength ranges from 860 to 1230 MPa, while its yield strength ranges from 620 to 1105 MPa. Moreover, this alloy has a high elongation capacity of up to 10%. Thanks to its impressive tensile and yield strength, AMS 5571 can withstand heavy loads and exposure to extreme conditions.

Mechanical Properties
Elongation at break ( % ) <60
Hardness – Brinell 160-190
Izod impact strength ( J.m-1 ) 20-136
Modulus of elasticity ( GPa ) 190-210
Tensile strength ( MPa ) 520-1100

AMS 5571 Uses

Due to its outstanding properties, AMS 5571 is highly valued in the aerospace and marine industries, which require high-quality materials. This alloy is commonly used in constructing aircraft and missile components and in naval equipment such as pumps, valves, and sea water-resistant tubes. Manufacturers in the automotive industry also use AMS 5571 to produce engine parts exposed to corrosive environments.

AMS 5571 Hardness

AMS 5571 has a hardness range of 32 to 37 HRC (Rockwell hardness). This is achieved through precipitation hardening, which ensures the alloy is strong and durable. The hardness of AMS 5571 contributes to its ability to withstand wear, making it helpful in manufacturing components that experience wear and tear, such as gears and bearings.

AMS 5571 Heat Treatment

AMS 5571 can be heat treated through a process known as solution annealing, which involves heating the alloy to 1010°C to 1120°C, followed by water quenching. This process restores the alloy’s corrosion resistance after welding and improves its elasticity. Alternatively, this alloy can be precipitation-hardened, which involves ageing the solution-annealed material from 510°C to 595°C. This process ensures that the alloy is both strong and tough.


AMS 5571 material is a high-quality stainless steel alloy that is highly valued for its corrosion resistance, exceptional mechanical properties, and impressive hardness. This alloy has found widespread use in the aerospace, automotive, and marine industries, where manufacturers look for components that can withstand harsh environments. By understanding AMS 5571’s composition, physical and mechanical properties, and uses, you can appreciate why it’s become a popular choice among manufacturers in the engineering world.

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