ThePipingMart Blog Grades AMS 4675 Monel Alloy – Composition, Properties and Uses

AMS 4675 Monel Alloy – Composition, Properties and Uses

AMS 4675

AMS4675 is a popular high-temperature alloy used in various industries due to its impressive physical and mechanical properties. This alloy is known for its excellent corrosion resistance, high oxidation resistance, and superior strength. If you are looking for an alloy that provides superior performance in high-temperature and corrosive environments, then AMS 4675 is the way to go. In this blog post, we’ll explore everything you need to know about AMS4675, including its composition, physical and mechanical properties, uses, hardness, heat treatment and more.

What is AMS 4675?

AMS4675 (also known as Monel 400 Alloy) is a high-strength alloy that is commonly used in the aerospace industry. With its exceptional toughness and resistance to fatigue, it is an ideal material for constructing aircraft components subjected to high stress and demanding operating conditions. What sets AMS 4675 apart from other alloys is its ability to maintain its strength even at high temperatures. This makes it popular for critical engine components such as turbine blades and compressor disks. As an expert in the field, I can attest to the extensive research and testing that goes into developing such materials, ensuring they meet the highest performance and durability standards. AMS 4675 is a testament to the evolution of materials science and engineering, serving as a reliable option for the aviation industry for decades to come.

What Form Is AMS 4675 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 4675 Composition

AMS 4675 is a nickel-based alloy with added cobalt, molybdenum, and tungsten. The alloy also contains trace amounts of carbon, manganese, silicon, phosphorus, sulphur, iron, and titanium. The precise combination of these elements gives AMS 4675 excellent physical and mechanical properties.

Element Content (%)
Nickel, Ni Remainder
Copper, Cu 28-34
Iron, Fe 2.5 max
Manganese, Mn 2 max
Silicon, Si 0.5 max
Carbon, C 0.3 max
Sulphur, S 0.024

AMS 4675 Physical Properties

AMS 4675 has some impressive physical properties. It is a highly corrosion-resistant alloy and can withstand high temperatures up to 1100°C. This alloy is also known for its excellent thermal conductivity, low thermal expansion, and good electrical conductivity. Its high melting point of 1420°C is an ideal candidate for high-temperature applications.

Properties Metric Imperial
Density 8.8 gm/cm3 0.318 lb/in3

AMS 4675 Mechanical Properties

AMS 4675 is classified as a precipitation-hardening alloy, which can be strengthened through heat treatment. This alloy has impressive strength and excellent flexibility. It also has low magnetic permeability and good fatigue resistance. These features make AMS 4675 an ideal choice for various applications that require high strength and durability at high temperatures.

Properties Metric Imperial
Tensile strength(annealed) 517-620 MPa 75-90 ksi
Yield strength 172-345 MPa 25-50 ksi
Modulus of elasticity 179 GPa 26000 ksi
Poisson’s ratio 0.32 0.32

AMS 4675 Equivalent

  • AMS 4574
  • AMS 4675
  • AMS 4731
  • ASTM B163
  • ASTM B165
  • ASTM F96
  • UNS N04400

AMS 4675 Uses

AMS 4675 has extensive usage in various industries, such as aerospace, nuclear power plants, chemical plants, and marine industries. This alloy is used to manufacture gas turbine engine components, aerospace engine applications, nuclear fuel handling components, marine engineering applications, and chemical processing equipment.

AMS 4675 Hardness

AMS 4675 has a high hardness level even at temperatures up to 650°C. The alloy is precipitation hardened to get excellent hardness levels and improve its mechanical properties. The hardness level also affects the wear resistance of the alloy and plays a significant role in its use in various industries.

AMS 4675 Heat treatment

AMS 4675 alloy can be strengthened through heat treatment. The alloy can be heat-treated either in an annealed or precipitation-hardened solution. During solution annealing, the alloy is heated above its critical temperature to dissolve any segregations that may have arisen due to hot working. The alloy is then rapidly cooled to room temperature to attain the desired strength level. During precipitation hardening, the alloy is heated to a temperature below its critical temperature, where the alloy’s elements start to precipitate, forming small particles, increasing the alloy’s strength.


AMS4675 material is a versatile and high-performance alloy that has entered various industrial applications. This alloy’s unique composition gives it excellent physical and mechanical properties, including high corrosion and oxidation resistance, excellent thermal and electrical conductivity, superior strength, and flexibility. Its high hardness level, wear resistance, and good fatigue resistance makes it perfect for highly durable applications at high temperatures. The alloy is extensively used in the aerospace, nuclear power plant, chemical plant, and marine industries for manufacturing gas turbine engine components, aerospace engine applications, nuclear fuel handling components, and chemical processing equipment. Through precise heat treatment, this alloy’s strength can be significantly improved.

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