ThePipingMart Blog Grades AMS 5670 Nickel Alloy – Composition, Properties, and Uses

AMS 5670 Nickel Alloy – Composition, Properties, and Uses

AMS 5670

AMS5670 is a type of high-performance steel used in different applications, especially in aerospace industries. This steel is designed to provide excellent strength, toughness, and corrosion resistance in extreme working conditions. This blog post will discuss the composition, physical and mechanical properties, and uses of AMS 5670. We will also discuss the hardness of the steel and its heat treatment process.

What is AMS 5670?

AMS 5670 (also known as Inconel Alloy X750) is a type of alloy steel known for its exceptional strength and durability. It’s commonly used in aerospace and industrial applications where power is crucial. The unique combination of elements in AMS5670 gives it superior resistance to wear, corrosion, and heat.

What Form Is AMS 5670 Available at Piping Mart?

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

AMS 5670 Composition

AMS 5670 is a low alloy steel that contains between 0.1% to 0.15% of carbon. Additionally, it contains nickel, chromium, molybdenum, and vanadium in different proportions. The steel also has small amounts of sulfur and phosphorus. These elements work together to enhance the steel’s strength and toughness.

Chromium (%) 14.0 to 17.0
Nickel + Cobalt (%) 70.00 Minimum
Iron (%) 5.0 to 9.0
Aluminium (%) 0.40 to 1.00
Titanium (%) 2.25 to 2.75
Manganese (%) 1.00 Maximum
Niobium + Tantalum (%) 0.70 to 1.20
Silicon (%) 0.50 Maximum
Copper (%) 0.50 Maximum
Sulfur (%) 0.01 Maximum
Cobalt (%) 1.00 Maximum
Carbon (%) 0.08 Maximum

AMS 5670 Physical Properties

AMS 5670 has a density of 7.85 g/cm³ at room temperature. The steel has a shear modulus of 79.3 GPa and a Poisson’s ratio of 0.29. It has a thermal conductivity of 24.9 W/mK and a thermal expansion of 11.1 µm/mK. The maximum service temperature for AMS 5670 is 870°C.

Density Lb/in3 0.299
g/cm3 8.28
Curie Temperature Hot-Rolled -225
Triple-Heat Treatment -193
Melting Range oF 2540 to 2600
oC 1393 to 1427
Magnetic Permeability Hot-Rolled 1.0020
Triple-Heat Treatment 1.0035
Linear Contraction Cold-Rolled (20 %) 0.00052
Hot-Rolled 0.00044
Annealed 0.00026
Oxidized Surface Emissivity At 600oF 0.895
At 2000oF 0.925

AMS 5670 Mechanical Properties

AMS 5670 sheets have a tensile strength of 1020 MPa and a yield strength of 850 MPa. The steel has an elongation of 16% and a reduction of area of 50%. The fatigue strength of the steel is 445 MPa. AMS 5670 also has excellent fracture toughness, making it suitable for applications where crack growth resistance is essential.

Tensile Strength MPa 1250
Ksi 181000
Yield Strength MPa 850
Ksi 123000
Elongation % 30

AMS 5670 Equivalent

  • Inconel X-750
  • UNS N07750
  • Nr. 2.4669
  • Alloy X-750
  • ATI X-750

AMS 5670 Uses

AMS 5670 tubes are commonly used in the aerospace industry to fabricate landing gears, wing spars, structural frames, and engine components. It also manufactures high-performance equipment such as cutting tools, drill bits, and bags. Due to its excellent corrosion resistance, the steel can also be used in marine environments.

AMS 5670 Hardness

AMS 5670 has a hardness level of Rockwell C45. This means the steel is relatively complex, making it suitable for applications requiring high wear and tear resistance, such as cutting tools and gears.

AMS 5670 Heat Treatment

The heat treatment process for AMS 5670 sheet involves quenching and tempering. The steel is heated to about 900°C and then rapidly cooled in a quenching medium such as water or oil. This process is followed by tempering, where the steel is heated to a lower temperature and held there for some time to improve its toughness and ductility. This process enhances the steel’s strength and toughness, making it suitable for highly demanding applications.


AMS 5670 material is a high-performance steel designed to provide excellent strength, toughness, and corrosion resistance in extreme working conditions. Its composition, physical and mechanical properties, uses, hardness and heat treatment process make it one of the most preferred steels for aerospace and high-performance tooling industries. Understanding the properties of AMS 5670 gives engineers a better idea of how to use it effectively in different applications.

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