ThePipingMart Blog Grades AMS 5671 Inconel Alloy – Composition, Properties, and Uses

AMS 5671 Inconel Alloy – Composition, Properties, and Uses

AMS 5671

If you are in metallurgy or engineering, you might have heard of AMS 5671. It is a high-performance steel alloy known for its excellent physical and mechanical properties. In this blog post, we will take a closer look at AMS 5671 and explore its composition, physical and mechanical properties, as well as its uses and heat treatment.

What is AMS 5671?

AMS 5671 (also known as Inconel X-750) is a specification for a specific type of high-strength steel alloy that can withstand extreme temperatures and pressures. This type of steel is commonly used in the aerospace industry for components such as turbine blades and high-stress engine parts. AMS5671 has specific requirements for its chemical composition, mechanical properties, and testing procedures to ensure that it meets the rigorous demands of the aerospace industry.

What Form is AMS 5671 Available at Piping Mart?

  • Bar
  • Nuts
  • Bolts
  • Washers
  • Screws
  • Fasteners
  • Stud Bolts
  • Sheet Plates

AMS 5671 Composition

AMS 5671 is a low-alloy steel composed of carbon, manganese, nickel, chromium, molybdenum, and vanadium. The carbon content typically ranges from 0.08-0.12%, while the manganese content is 0.30-0.60%. Nickel is present in a range of 1.40-2.00%, while chromium is usually around 0.50-0.80%. Adding molybdenum (0.20-0.30%) and vanadium (0.06-0.10%) to the alloy helps improve its strength, making it ideal for high-stress applications.

Element Min % Max %
C 0.08
Mn 1.00
Si 0.50
S 0.01
Cr 14.00 17.00
Ni 70.00
Nb/Cb 0.70 1.20
Ti 2.25 2.75
Al 0.40 1.00
Fe 5.00 9.00
Co 1.00
Ta 0.05
Cu 0.50

AMS 5671 Physical Properties

AMS 5671 possesses excellent physical properties, making it a sought-after material in the aerospace and defence industry. It has a density of 7.85 g/cm³ and a melting point of 1425°C. The heat conductivity is low, but its thermal expansion coefficient is relatively moderate. AMS 5671 is also known for having good corrosion resistance, particularly against oxidizing acids and seawater.

Density (lb / cu. in.) 0.298
Specific Gravity 8.25
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.103
Electrical Resistivity (microhm-cm (at 68 Deg F)) 731
Melting Point (Deg F) 2575
Thermal Conductivity 83
Mean Coeff Thermal Expansion 7
Magnetic Permeability 1
Modulus of Elasticity Tension 31
Reduction of Area 42

AMS 5671 Mechanical Properties

The mechanical properties of AMS 5671 are impressive, making it the material of choice for high-performance applications. Its ultimate tensile strength is between 930-1080 MPa, while the yield strength is 780-930 MPa. The elongation at break is around 18%, and the modulus of elasticity is 200 GPa. AMS 5671 has a high fatigue resistance and is also resistant to stress corrosion cracking.

AMS 5671 Uses

AMS 5671 is used in various industries, including aerospace, defence, automotive, and petroleum. It is mainly used for applications that require high strength, such as turbine engines and landing gears. The alloy’s excellent fatigue strength suits racing car components, tools, die-making, and gun barrels.

AMS 5671 Hardness

AMS 5671 has a hardness range of 269-341 HBW, making it a tough and durable material. However, its hardness can be increased further by heat treatment and cold working, increasing its strength.

AMS 5671 Heat Treatment

Heat treatment plays a critical role in the properties and performance of AMS 5671. The alloy can be annealed at 850-890°C followed by air cooling or quenching. This process helps improve the material’s ductility and toughness. AMS 5671 can also be hardened by quenching and tempering at 120-160°C, which increases its strength while maintaining some ductility.


AMS 5671 material is a versatile material with high strength and excellent physical and mechanical properties. Its low alloy composition and heat-treatable properties make it a suitable material for various applications, particularly in the aerospace and defence industry. The material’s ability to withstand fatigue and stress-corrosion cracking makes it an attractive option for industry sectors requiring tough and durable materials. Finally, AMS 5671 can be customized to meet specific requirements and applications with proper heat treatment.

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