ThePipingMart Blog Grades AMS 5731 Stainless Steel Alloy – Properties, Composition, and Uses

AMS 5731 Stainless Steel Alloy – Properties, Composition, and Uses

AMS 5731

If you’re in the aerospace or gas turbine industry, you’ve likely heard of AMS 5731. It’s a popular stainless steel alloy that has a range of excellent mechanical and physical properties. In this blog post, we’ll delve into what AMS 5731 is, its composition, properties, and applications.

What is 5731?

AMS 5731 (also known as Stainless Steel A286) is a high-performance metal alloy engineered to withstand extreme temperatures and pressure. This alloy is popular among aerospace, marine, and defence manufacturers. What sets AMS5731 apart from other metal alloys is its exceptional strength, durability, and resistance to corrosion. This makes it the ideal material for high-performance applications, such as turbine engine components, rocket motor cases, and missile nose cones. With its unique properties, AMS5731 has become an essential component in producing cutting-edge technology and equipment that pushes the limits of human innovation.

AMS 5731 Composition

AMS 5731 sheet is a type of stainless steel alloy that contains nickel, chromium, molybdenum, and traces of other elements. It has a low carbon content, giving it desirable properties. Its composition is as follows: 19% to 21% chromium, 9% to 10.5% nickel, 5% to 6.5% molybdenum, 0.05% to 0.15% carbon, 0.75% maximum manganese, 0.035% maximum phosphorus, and 0.03% maximum sulfur.

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 5731 Physical Properties

The physical properties of AMS 5731 tubing include a density of 0.288 lb/in3, a melting range of 2625-2750°F, and thermal conductivity of 71.7 BTU/hr ft °F. It is also non-magnetic and has a coefficient of thermal expansion of 9.6 µm/m °C.

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

AMS 5731 Mechanical Properties

AMS 5731 material’s mechanical properties are impressive, making it a popular choice for aerospace and gas turbine applications. Its ultimate tensile strength is 195 ksi, with a yield strength of 170 ksi. AMS 5731 also has a high percentage of elongation (30%), ductility, and impact resistance. Additionally, it retains its strength at high temperatures of up to 1500°F.

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 5731 Equivalent

AISI 660 AMS 5525 AMS 5726 AMS 5732 AMS 5734
UNS S66286 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

AMS 5731 Uses

AMS 5731 bars is widely used in the aerospace and gas turbine industry due to its excellent mechanical and physical properties. It’s often used for parts that require good corrosion resistance, high strength, and temperature resistance. It’s commonly found in turbine engine components, exhaust systems, manifolds, and flanges. The oil and gas industry also uses AMS 5731 for valves, pumps, and other components.

AMS 5731 Hardness

AMS 5731 has a 302-388 HB hardness, which is excellent for a stainless steel alloy. Its hardness makes it ideal for applications requiring high wear resistance, such as shafts and gears.

AMS 5731 Heat Treatment

AMS 5731 can be heat-treated to enhance strength, durability, and ductility. It can be annealed at 1950°F for 30 minutes, followed by rapid air cooling to achieve the desired mechanical properties.


AMS 5731 material is a popular stainless steel alloy with excellent mechanical and physical properties that make it ideal for the aerospace and gas turbine industry. This blog post discusses its composition, properties, and applications. Its impressive strength, ductility, and high-temperature resistance make it an excellent alloy for demanding applications. So, if you’re in the aerospace or gas turbine industry, AMS 5731 is an alloy you should consider for your next project.

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