ThePipingMart Blog Grades AMS 4730 Monel Alloy – Composition, Properties and Uses

AMS 4730 Monel Alloy – Composition, Properties and Uses

AMS 4730

AMS 4730 is a manganese bronze alloy widely used across several industries for its unique physical and mechanical properties. This high-strength alloy is well-known for its corrosion resistance, wear resistance, and excellent machinability. This blog post will delve deeper into AMS 4730’s composition, physical and mechanical properties, uses, hardness and heat treatment. By the end of this article, you will thoroughly understand AMS4730, its properties, and how it can benefit your industry.

What is AMS 4730?

AMS4730 (also Known as Monel 400 Alloy) is a unique and important code that plays a vital role in the aerospace industry. It is a specification that defines the minimum requirements for high-strength alloy steel parts used in aircraft and aerospace applications. These parts are critical to the safety and performance of aeroplanes, satellites, and other aerospace machinery. The AMS 4730 code ensures these essential components’ proper metallurgical composition, strength, and durability. Engineers and manufacturers rely on this code to meet the rigorous demands of the aerospace industry and maintain the highest levels of safety and performance. In short, AMS 4730 is more than just a code; it symbolises excellence in aerospace engineering.

What Form Is AMS 4730 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 4730 Composition

AMS4730 is a copper alloy that contains manganese, aluminium, iron, nickel and other trace elements. The amount of each element is carefully controlled to achieve the desired performance characteristics. The unique microstructure formed by the alloy’s composition gives the material its outstanding properties, such as high strength, flexibility, and corrosion resistance. Manganese in AMS 4730 helps to increase strength, aluminium improves wear resistance, and nickel enhances the alloy’s ductility. Overall, the well-balanced composition of AMS 4730 makes it a versatile material that excels in various applications.

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 4730 Physical Properties

AMS4730’s unique physical properties make it a popular choice for different industries. Its density is around 7.77 g/cm³, and its melting temperature is approximately 1020°C. This alloy exhibits excellent corrosion resistance and is resistant to stress corrosion cracking, pitting, and crevice corrosion, making it ideal for marine, chemical processing, and oil and gas industries. AMS 4730 also has good electrical conductivity, making it a preferred electronic component and connector material.

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

AMS 4730 Mechanical Properties

AMS 4730 has exceptional mechanical properties that make it suitable for heavy-duty applications. It has a high tensile strength of 90 ksi and a yield strength of 50 ksi. The elongation at break is 17%, which indicates the alloy’s ductility. The alloy’s mechanical properties can be enhanced using heat treatment to improve hardness and strength. It is also important to note that AMS 4730 has excellent machinability, allowing for easy shaping and forming.

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 4730 Equivalent

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

AMS 4730 Specification



Metal Type

UNS N04400

AMS 4730 Bar

ASTM B164 QQ-N-281 Din 17750

AMS 4730 Wire

AMS 4730 Sheet

ASTM B127 QQ-N-281

AMS 4730 Plate

ASTM B127 QQ-N-281

AMS 4730 Pipe
AMS 4730 Tube

AMS 4730 Fitting


AMS 4730 Forging


AMS 4730 Weld Wire

FM 60/ ERNiCu-7/ 17753

AMS 4730 Weld Electrode
FM 190 ENiCu-7



AMS 4730 Uses

AMS 4730 is used in various industries due to its versatility. Its unique properties make it ideal for marine hardware, pumps, valves, and other components exposed to seawater, chemicals, and harsh environments. Aerospace industries use AMS 4730 to manufacture components that require high strength, corrosion resistance, and low wear. The electronics industry uses this material in connectors, contactors, and other components that require high conductivity and durability. Oil and gas industries utilize AMS 4730 in systems and components used in harsh and corrosive environments.

AMS 4730 Hardness

AMS 4730 has a hardness range between 190 to 240 Rockwell B. The hardness of AMS 4730 can be further improved using heat treatment techniques such as annealing, normalizing, quenching and tempering. These techniques alter the alloy’s microstructure, increasing hardness, strength and flexibility.

AMS 4730 Heat treatment

Heat treatment is crucial in improving the hardness and mechanical properties of AMS 4730. Annealing heats the alloy to a specific temperature and then cools it slowly. This technique enhances ductility but decreases hardness. Normalizing also improves elasticity while increasing hardness. Quenching and tempering are used to increase hardness and strength in AMS 4730. Quenching involves cooling the alloy rapidly while tempering reheats the alloy to improve flexibility and toughness.


AMS 4730 material is a versatile alloy that possesses excellent mechanical and physical properties. It is well-balanced composition and unique microstructure make it a preferred choice across various industries. Its high strength, wear, and corrosion resistance make it perfect for aerospace, marine, oil and gas, and electronics industries. The alloy can also be heat-treated to enhance its mechanical properties, including hardness and flexibility. In summary, AMS 4730 is a powerful material that offers many unique benefits to different industries.

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