ThePipingMart Blog Grades AMS 5766 Incoloy Alloy – Composition, Properties, and Uses

AMS 5766 Incoloy Alloy – Composition, Properties, and Uses

AMS 5766

AMS 5766 is a highly popular steel alloy known for its impressive physical and mechanical properties, making it ideal for various industrial applications. Whether you work in aerospace, engineering, or any other industry that requires the use of advanced materials, it is essential to know about the properties and composition of this alloy. This blog post will look at AMS5766’s composition, physical and mechanical properties, and uses.

What is AMS 5766?

Hey there! Have you ever heard of AMS 5766 (also known as Incoloy 800 Alloy )? Don’t worry if you still need to; it’s not a household name. AMS 5766 (also known as Incoloy 800 Alloy ) is a specific type of steel alloy often used in high-stress applications, such as aerospace components. This alloy is known for its excellent strength and corrosion resistance, making it a top choice for critical parts that withstand harsh environments. So, if you’re looking for a tough, reliable material, AMS5766 might be just what you need.

What Form Is AMS 5766 Available at Piping Mart?

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

AMS 5766 Composition

AMS 5766 is a low carbon, high nickel, and molybdenum steel alloy created by vacuum induction melting and arc remelting processes. Its composition includes 0.05% carbon, 25% nickel, 2.25% molybdenum, 1.5% chromium, 0.03% sulfur, 0.75% silicon, 0.5% manganese, and 0.02% phosphorus. Its composition is carefully designed to promote excellent corrosion resistance, ductility, and strength.

Element Content (%)
Iron, Fe ≥39.5
Nickel, Ni 30-35
Chromium, Cr 19-23
Manganese, Mn ≤1.5
Others Remainder

AMS 5766 Physical Properties

AMS 5766 is a high-strength alloy with impressive physical properties like high thermal conductivity, excellent ductility, and corrosion resistance. The density of AMS 5766 is 7.85 g/cm3, and its melting point is approximately 1380°C. It boasts a specific heat capacity of 460 J/kg.K and an electrical resistivity of 0.65 ×10^-6 ohm.m.

Properties Metric Imperial
Density 7.94 gm/cm3 0.287 lb/in3

AMS 5766 Mechanical Properties

AMS 5766 has a high yield strength of 900 MPa and a tensile strength of 1050 MPa with a minimum elongation of 15%. The alloy boasts excellent toughness, and its extension and notch sensitivity values make it the material of choice for demanding applications requiring strength and toughness. Furthermore, AMS 5766 exhibits remarkable fatigue resistance and a high modulus of elasticity.

Properties Metric Imperial
Tensile strength(annealed) 600 MPa 87 ksi
Yield strength(annealed) 275 MPa 39.9 ksi
Elongation at Break 45% 45%

AMS 5766 Equivalent

UNS N08800 AMS 5766 AMS 5871 ASTM B163 ASTM B366
ASTM B564 DIN 1.4876

AMS 5766 Uses

AMS 5766 is widely used in the aerospace and defence industries to manufacture jet engine components, fuel system parts, gas turbine parts, and other high-stress applications. It also manufactures marine components, chemical processing equipment, and power generation equipment. It’s exceptional corrosion resistance and high strength make it ideal for applications where harsh environments and extreme temperatures are a concern.

AMS 5766 Hardness

Depending on the heat treatment applied, AMS 5766 exhibits a hardness value in the 200-300 HB range. The alloy can be hardened through several methods, including oil quenching, water quenching, and air cooling. It can also be annealed to a lower hardness for applications that require good ductility and machinability.

AMS 5766 Heat Treatment

AMS 5766 can be heat-treated to improve its physical and mechanical properties, including hardness, ductility, and strength. The appropriate heat treatment applied to this alloy generally includes initial preheating at 1100°F followed by complete annealing at 1900-1950°F for an hour per inch of the thickness of the material, which is then air-cooled to room temperature. For optimum results like higher strength and hardness values, a two-step hardening procedure can be done by quenching the material in oil or water from 1700°F before tempering it at 1300°F.


AMS 5766 is a highly versatile alloy with impressive physical and mechanical properties. Its strength, ductility, and corrosion resistance make it popular for various critical applications, including aerospace and defence, chemical processing, and power generation. Its elaborate chemical composition, unique heat treatment, and hardness provide extensive flexibility in optimising it for a specific requirement; by understanding what AMS 5766 is and its properties, engineers and manufacturers can make informed decisions on material and heat treatment selection to ensure the success of their product.

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AMS 5766 Incoloy Alloy – Composition, Properties, and Uses

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