ThePipingMart Blog Grades AMS 7727 Nickel Alloy – Composition, Properties and Uses

AMS 7727 Nickel Alloy – Composition, Properties and Uses

AMS 7727

Materials used in construction and engineering must meet rigorous specifications to provide excellent performance in demanding environments. AMS 7727 is a unique material that has earned its reputation as the go-to material for high-stress applications. With superior physical and mechanical properties, AMS 7727 ensures excellent performance, durability, and longevity. This blog post will provide valuable insights into AMS 7727’s composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 7727?

AMS 7727 (also known as Nilo K Alloy) is a high-strength, low-alloy steel used in critical components of aerospace applications. Characterized by its exceptional strength, toughness, and corrosion resistance, this material is highly sought-after by engineers seeking maximum performance and reliability. With its ability to withstand extreme temperatures and stress, AMS 7727 is a formidable choice for aviation and space exploration’s most challenging design requirements.

AMS 7727 Composition

AMS 7727 is a chromium-molybdenum alloy steel strengthened by adding nickel and nitrogen. The chemical composition consists of carbon, 0.09%; silicon, 0.30%; manganese, 1.00%; phosphorus, 0.025%; sulfur, 0.025%; chromium, 0.80% to 1.10%; nickel, 1.50% to 2.00%, molybdenum, 0.25% to 0.35%, and nitrogen, 0.025% to 0.045%. Combining these elements gives AMS 7727 high strength, corrosion resistance, and exceptional toughness.

Element Content (%)
Iron, Fe 53
Nickel, Ni 29
Cobalt, Co 17
Others Remainder

AMS 7727 Physical Properties

AMS 7727 has excellent physical properties such as a high melting point of 1500°C, thermal conductivity of 24.3 W/mK, and density of 7.87 g/cm³. Additionally, its coefficient of thermal expansion of 12.0 µm/m°C allows for excellent machinability.

Properties Metric Imperial
Density 8.16 gm/cm3 0.295 lb/in3

AMS 7727 Mechanical Properties

The mechanical properties of AMS 7727 steel are exceptional. It has a yield strength of 629 MPa, tensile strength of 894 MPa, and high ductility. AMS 7727 can withstand high temperature and pressure conditions and resist cracking and deformation.

Properties Metric Imperial
Tensile strength 520MPa 75.4 ksi
Yield strength 340 MPa 49.3 ksi
Modulus of elasticity 130 GPa 18900 ksi

AMS 7727 Equivalents

  • UNS K94610
  • ASTM F15
  • DIN 17745
  • AFNOR NF A54-301.

AMS 7727 Uses

AMS 7727 is commonly used in the aerospace and defence industry, where high strength and durability are required. Its strength and toughness make it ideal for critical components such as landing gears, hydraulic actuators, and piston rods. AMS 7727 is also used in automotive and oil and gas industries, where its corrosion resistance and outstanding mechanical properties are highly valued.

AMS 7727 Hardness

AMS 7727 has excellent hardness and can be hardened by heat treatment. The material has a Rockwell hardness of 33 HRC and can reach up to 55 HRC after heat treatment. The hardness ensures it can withstand the harshest conditions without compromising strength or durability.

AMS 7727 Heat treatment

The heat treatment process is essential to fully utilize the exceptional properties of AMS 7727. This process involves heating the material to a high temperature and then quickly cooling it to produce a rigid and durable structure. This process enhances the mechanical properties, including the material’s hardness, ductility, and toughness.


AMS 7727 is an exceptional material with an excellent reputation for high-stress applications. Its composition, physical properties, mechanical properties, uses, and hardness makes it a go-to material in the aerospace, defence, automotive, and oil and gas industries. Its exceptional strength, toughness, and durability ensure the best performance and longevity. Hardening the material through heat treatment is crucial to extract the full potential of its properties. As an expert, I highly recommend the application of AMS 7727 in various industries to ensure the best performance and durability of critical components.

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