ThePipingMart Blog Grades AMS 5525 Stainless Steel Alloy – Composition, Properties, and Applications

AMS 5525 Stainless Steel Alloy – Composition, Properties, and Applications

AMS 5525

AMS 5525 is a popular aerospace-grade stainless steel alloy widely used in various industries, including aircraft and missile production, petrochemical processing, nuclear engineering, and medical device fabrication. In this blog, we will delve deeper into the composition, properties, and applications of AMS 5525 and how it compares to other stainless steel alloys.

What is AMS 5525?

AMS 5525 (also known as Stainless Steel A286) is a standard used in the aerospace and defence industries. It specifies requirements for corrosion and heat-resistant stainless steel sheets, strips, and plates. This material is commonly used in applications where extreme conditions are a concern, such as jet engines and gas turbines. The AMS5525 standard ensures that the material meets strict guidelines for durability and performance. It’s fascinating to think that a little-known standard like AMS5525 plays a critical role in ensuring the safety and reliability of the equipment we rely on daily.

AMS 5525 Composition

AMS 5525 sheet is a type of stainless steel comprising 17-19% chromium, 9-12% nickel, and 2.5-3.5% molybdenum. Additionally, it contains small amounts of carbon, manganese, silicon, phosphorus, sulfur, and nitrogen. These elements create a highly corrosion-resistant alloy that can withstand extreme temperatures, pressures, and harsh environments.

Element Content (%)
Iron, Fe 54
Nickel, Ni 25.5
Chromium, Cr 14.8
Titanium, Ti 2.13
Molybdenum, Mo 1.30
Manganese, Mn 1.0
Silicon, Si 0.50
Vanadium, V 0.30
Aluminum, Al 0.18
Carbon, C 0.040
Phosphorous, P 0.020
Sulfur, S 0.015
Boron, B 0.0060

AMS 5525 Physical Properties

AMS 5525 has a density of 7.93 g/cm3 and a melting point of 1399-1427°C. It has a high thermal conductivity and can resist scaling and oxidation at temperatures up to 870°C. This alloy is also non-magnetic in its annealed state and exhibits a low coefficient of thermal expansion at high temperatures.

Properties Metric Imperial
Density 7.92 g/cm3 0.286 lb/in3
Melting point 1399°C 2550°F

AMS 5525 Mechanical Properties

AMS 5525 plates offers excellent mechanical strength, toughness, and flexibility. Its tensile strength ranges from 690-900 MPa, while its yield strength varies from 430-515 MPa. Its elongation at break can reach 40%, which makes it well-suited for forming and shaping. AMS 5525 is highly elastic and can resist fatigue and creep under high loads and repeated stress.

Properties Metric Imperial
Tensile strength 1035 MPa 150100 psi
Yield strength (@strain 0.200%) 759 MPa 110000 psi
Elongation at break 25% 25%
Reduction of area 40% 40%
Hardness, Brinell (estimated from Rockwell C value for Brinell test with 3000 kg load/10 mm diameter ball) 304 304
Hardness, Knoop (estimated from Rockwell C value) 330 330
Hardness, Rockwell C 32 32
Hardness, Vickers (estimated from Rockwell C value) 318 318

AMS 5525 Equivalent

Equivalent materials to AMS 5525  are given in the table below.

AISI 660 AMS 5525 AMS 5726 AMS 5732 AMS 5734
AMS 5731 AISI 662 AMS 5737 AMS 5804 AMS 5895
AMS 5853 AMS 5805 AMS 5858 DIN 1.4943 SPS M250
DIN 1.4944 GE B50T81 GE B50T12 GE B50T1181 ASTM A453 Grade 660
ASTM A638 Grade 660 stainless steel A-286 UNS S66286

AMS 5525 Uses

AMS 5525 tubing is used in various applications that require high strength, corrosion resistance, and high-temperature stability. It is commonly used in aircraft and missile components, such as exhaust systems, turbine blades, and engine parts. It is also used in the petrochemical industry for processing equipment, such as heat exchangers, valves, and piping. Additionally, it is used in medical devices, nuclear reactors, and high-stress structural components.

AMS 5525 Hardness and Heat Treatment

AMS 5525 can be heat treated to improve its hardness, strength, and durability. Its hardness typically ranges from 25-35 HRC, depending on the alloy grade and heat treatment method. Solution annealing, quenching, and ageing are commonly used to enhance the mechanical properties of this alloy. However, over-treatment can lead to brittleness and reduced corrosion resistance.


In conclusion, AMS 5525 material is a versatile and reliable stainless steel alloy with exceptional mechanical, physical, and chemical properties. It’s excellent corrosion resistance, and high-temperature stability makes it a preferred choice for critical aerospace, petrochemical, and medical applications. Its balanced chromium, nickel, and molybdenum composition gives it superior strength and durability, while its flexibility and toughness make it easy to form and shape. To ensure the desired properties and performance of AMS 5525, it is crucial to use proper heat treatment and handling procedures. Choosing the right alloy for your application can make all the difference in the success and safety of your project.

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