ThePipingMart Blog Grades AMS 4676 Monel Alloy – Composition, Properties and Uses

AMS 4676 Monel Alloy – Composition, Properties and Uses

AMS 4676

AMS4676 is a type of alloy steel widely used in the aerospace and defence industries. It is known for its high strength, excellent wear resistance, and toughness. The composition of AMS 4676 is carefully balanced to provide these properties, making it a popular choice for parts and components in demanding applications. This blog post will explore everything you need to know about AMS4676, including its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 4676?

AMS 4676 (also known as Monel K-500) is a nickel alloy that has gained much attention recently for its unique properties. It is a high-strength material that can withstand extreme temperatures and harsh environments, making it ideal for use in aerospace, defence, and power generation industries. This alloy has excellent corrosion resistance, good flexibility, and high toughness. The properties of AMS 4676 make it a valuable asset to these industries, as it can help increase the lifespan and reliability of various components and systems. As such, it is becoming increasingly popular among manufacturers and engineers alike.

AMS 4676 Composition

AMS4676 is a low-alloy steel composed of carbon, manganese, chromium, and molybdenum. The carbon content is kept low to maintain the material’s toughness, while the other elements are added to enhance its strength and wear resistance. The manufacturer or customer typically specifies the exact composition of AMS 4676.

Ni Cu Al Ti C Mn Fe S Si
63.0-70.0 Remainder 2.30-3.15 .35-.85 .25 max 1.5 max 2.0 max .01 max .50 max

AMS 4676 Physical Properties

AMS 4676 has a density of around 7.7 g/cm3 and a melting point of approximately 1,425°C. It is a metallic material with a silver-grey appearance and a smooth surface texture. It has good electrical and thermal conductivity, making it suitable for applications where heat transfer is necessary.

Properties Metric Imperial
Density 8.45 g/cm³ 0.305 lb/in³
Melting point 1338°C 2440°F

AMS 4676 Mechanical Properties

AMS 4676 is known for its high strength and excellent toughness. It has a tensile strength of 160 ksi or greater and a yield strength of 145 ksi or greater. It also has good fatigue resistance, making it suitable for parts and components subjected to cyclic loading. Its wear resistance is also exceptional, with a low coefficient of friction and excellent resistance to abrasion and erosion.

Hardness (HB) Ultimate Tensile Strength (N/mm²) Proof Stress (N/mm²) Elongation (%)
27-35 HRC 970-1000 690-760 15-20

AMS 4676 Equivalent

  • Monel Alloy K500, Nickel K500 (NA18, N05500)
  • 2.4374
  • 2.4375
  • NA18
  • N05500
  • BS3076
  • ASTM B865
  • AMS 4676
  • NiCu30Al (DE)

AMS 4676 Specification




Metal Type

UNS N05500


ASTM B865 QQ-N-286




ASTM B865 QQ-N-286


ASTM B865 QQ-N-286



QQ-N-286 Din 17754

Weld Wire

FM 60 ERNiCu-7

Weld Electrode
FM 190 ENiCu-7 Din 17753



AMS 4676 Uses

AMS 4676 is commonly used in the aerospace and defence industries for parts and components that require high strength, toughness, and wear resistance. Its applications include landing gears, engine components, missile and rocket parts, and structural components for aircraft and spacecraft. It is also used in the oil and gas industry for drilling and downhole tools and in the automotive and power generation sectors.

AMS 4676 Hardness

AMS 4676 has a Rockwell hardness of around 50-55 HRC, depending on its heat treatment. It is a moderately hard material, making it suitable for applications where wear resistance is necessary. It can also be surface hardened through carburizing, nitriding, or induction hardening, further increasing its hardness and wear resistance.

AMS 4676 Heat treatment

AMS 4676 can be heat treated to optimize its mechanical properties. The most common heat treatment process for AMS 4676 is quenching and tempering. It involves heating the material to a specific temperature and then rapidly cooling it in a quenching medium such as oil or water. This process produces a hard, strong, tough material with excellent wear resistance. Other heat treatment processes such as annealing, normalizing, and stress relieving may also achieve specific properties or improve machinability.


AMS 4676 material is a versatile alloy steel with exceptional strength, toughness, and wear resistance, making it a popular choice for demanding aerospace, defence, oil and gas, automotive, and power generation applications. Its carefully balanced composition and optimized heat treatment processes make its properties and applications flexible. Understanding the composition, physical and mechanical properties, uses, hardness and heat treatment of AMS 4676 is crucial for selecting the right material for your specific needs.

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