ThePipingMart Blog Grades AMS 5618 Stainless Steel – Composition, Properties, and Uses

AMS 5618 Stainless Steel – Composition, Properties, and Uses

AMS 5618

When choosing the right material for your project, there are several factors to consider, such as composition, physical properties, mechanical properties, and heat treatment. One of the materials worth studying is AMS 5618. This blog will closely examine AMS 5618, its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 5618?

AMS 5618 (also known as 440C Stainless Steel) is a type of steel specifically designed for high-stress applications. This steel is known for its exceptional strength and durability, making it an ideal material for various industrial and commercial applications. AMS 5618 steel is often used to manufacture aircraft components and construct heavy machinery and other equipment that must withstand extreme forces and conditions. Whether you are a manufacturer, engineer, or industrial designer, AMS5618 steel can be an invaluable asset in your quest to create high-quality, long-lasting products that can withstand the rigors of heavy use and demanding environments. If you want a material to help, you achieve your goals, consider utilizing AMS5618 steel in your next project.

What Forms is AMS 5510 Available at Piping Mart?

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

AMS 5618 Composition

AMS 5618 material is a martensitic stainless steel that contains chromium, nickel, and molybdenum. The alloy can be heat-treated to achieve strength and hardness suitable for high-stress applications. The chromium content provides excellent corrosion resistance, while the molybdenum enhances the material’s resistance to pitting and crevice corrosion.

Element Content (%)
Iron, Fe 79.15
Chromium, Cr 17
Carbon, C 1.1
Manganese, Mn 1
Silicon, Si 1
Molybdenum, Mo 0.75

AMS 5618 Physical Properties

AMS 5618 has a density of 7.74 g/cm3 and a melting point of 1399°C. The material has a low thermal conductivity but exhibits excellent thermal expansion properties. It also has a high electrical resistivity, making it suitable for applications requiring electrical insulation.

Properties Metric Imperial
Density 7.80 cm³ 0.282 lb/in³
Melting point 1483°C 2700°F

AMS 5618 Mechanical Properties

AMS 5618 material properties has high strength and excellent toughness. It has a tensile strength of 1871 MPa and a yield strength of 1707 MPa. The material has good elongation and flexibility, making it easy to form, shape, and bend. When heat-treated, AMS 5618 exhibits high hardness and wear resistance, making it suitable for harsh environments.

Properties Metric Imperial
Tensile strength 760-1970 MPa 110000-286000 psi
Yield strength (@ strain 0.200%) 450-1900 MPa 65300-276000 psi
Bulk modulus 166 GPa 24100 ksi
Shear modulus 83.9 GPa 12200 ksi
Elastic modulus 200 GPa 29008 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break 2-14 % 2-14 %
Hardness, Rockwell B (converted from Brinell hardness) 97 97

AMS 5618 Equivalents

  • AMS 5618
  • AMS 5630
  • AMS 5880
  • ASTM A276
  • ASTM A314
  • ASTM A473
  • ASTM A493
  • ASTM A580
  • DIN 1.4125
  • QQ S763
  • MIL-S-862
  • SAE 51440C
  • SAE J405 (51440C)

AMS 5618 Uses

AMS 5618 is used in many applications that require high strength, excellent toughness, and corrosion resistance. It is commonly used in aircraft landing gear, chemical processing equipment, industrial valves and fittings, and pump components. Additionally, it is used to construct nuclear reactors, boiler tubes, and other high-stress applications.

AMS 5618 Hardness

AMS 5618 can be heat-treated to achieve high hardness levels. When heated to a temperature range of 1010-1065°C and quenched in oil or air, it exhibits a hardness of 55 HRC. The material can be further hardened by tempering at a temperature range of 290-565°C, resulting in a hardness range of 40-50 HRC.

AMS 5618 Heat Treatment

Heat treatment is essential for achieving the desired mechanical and physical properties of AMS 5618. The material can be heat-treated by quenching and tempering. During the quenching process, the material is heated to a temperature range of 1010-1065°C and rapidly cooled in oil or air. The tempering process involves heating the quenched material to a temperature range of 290-565°C and holding it for a specific period to achieve the desired hardness and strength.


In conclusion, AMS 5618 is an excellent material for high-stress applications that require excellent strength, toughness, and corrosion resistance. It is commonly used in aircraft landing gears, nuclear reactors, and chemical processing equipment. By understanding its composition, physical and mechanical properties, uses, hardness, and heat treatment, you can decide whether AMS 5618 is the right material for your next project.

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