ThePipingMart Blog Grades AMS 4674 Nickel Alloy – Composition, Properties and Uses

AMS 4674 Nickel Alloy – Composition, Properties and Uses

AMS 4674

Whether in the aerospace or oil and gas industry, you’ve likely heard of AMS4674. This material is highly regarded for its superb mechanical properties, wear resistance and excellent machinability, making it a popular metal alloy for critical components such as hydraulic flanges, gears, and shafts. But what is AMS 4674, and why is it such a preferred metal alloy? In this blog post, we’ll look in-depth at the composition, physical and mechanical properties, heat treatments, hardness, and applications of AMS4674.

What is AMS 4674?

AMS 4674 ( also known as Monel R-405) may sound like a complicated code, but it is a specific type of alloy used in aerospace engineering. This alloy is made of nickel, cobalt, and chromium and is known for its excellent strength and durability in high-temperature environments. It is often used in critical components such as jet engine turbine blades and other aircraft parts subject to extreme stress and heat. Engineers rely on AMS4674 to meet the strict requirements of the aerospace industry, where safety and reliability are paramount. This alloy’s strength and heat resistance allow planes to fly smoothly and safely through the air, carrying passengers and cargo across the globe.

AMS 4674 Composition

AMS 4674 is an iron-based alloy comprising around 25% nickel, 6% molybdenum, 1.6% titanium, and 1.3% aluminium. It’s a precipitation-hardening steel with a high level of machinability, excellent corrosion resistance, and an outstanding combination of high strength and impact toughness. AMS 4674 has excellent wear resistance and fatigue strength, making it an ideal choice for critical shafts, gears, and bearing applications in the aerospace, oil, gas, and power generation industries.

Elements Content (%)
Nickel, Ni 63
Copper, Cu 28-34
Iron, Fe  2.50
Manganese, Mn  2
Carbon, C  0.30
Silicon, Si  0.50
Sulfur, S 0.025 – 0.060

AMS 4674 Physical Properties

Regarding the physical properties of AMS 4674, this metal alloy has a density of 0.282 lb/in³, a melting point of around 2,550°F, and a specific heat capacity of approximately 0.11 Btu/lb•°F. These physical properties make AMS 4674 a highly stable alloy that can withstand high temperatures, chemical attacks, physical stress and fatigue.

Properties Metric Imperial
Density 8.80 g/cm³ 0.318 lb/in³
Melting point 1338°C 2440°F

AMS 4674 Mechanical Properties

The mechanical properties of AMS 4674 are outstanding. A precipitation-hardening element, AMS 4674, can be heat-treated to achieve excellent mechanical properties such as high tensile strength, yield strength, and hardness. For instance, when heat-treated, AMS 4674 can achieve a tensile strength of around 220,000 psi, yield strength of 200,000 psi, and an elongation of 15%. Additionally, it also has a Vickers hardness of around 430-500.

Properties Metric Imperial
Tensile Strength (annealed) 550 MPa 79800 psi
Yield strength (@ strain 0.200%, annealed) 240 MPa 34800 psi
Elongation at break (annealed) 40% 40%

AMS 4674 Equivalent

  • AMS 4674
  • ASTM F467
  • ASTM F468
  • QQ N281

AMS 4674 Uses

AMS 4674 is widely used in the aerospace and power generation industries, where high tensile strength, excellent machinability, and corrosion resistance are necessary. It manufactures critical components such as hydraulic flanges, gears, aircraft bearings, and landing gears. Additionally, it’s widely employed in the oil and gas sector, where it’s used in manufacturing drilling equipment, wellheads, and valves.

AMS 4674 Heat Treatment

Heat treatment of AMS 4674 is essential to achieve the desired mechanical properties; AMS 4674 undergoes various heat treatments such as solution treatment and precipitation hardening. The solution treatment involves heating the material to a temperature of around 1900°F and holding it for two hours to dissolve any alloying elements. After solution treatment, the material is air-cooled to reach room temperature. The material is then subjected to precipitation hardening, whereby it’s heated to a temperature ranging from 900 to 1150°F and held for 2-4 hours before cooling.


AMS 4674  material is a highly regarded metal alloy for its excellent mechanical properties, wear resistance and outstanding machinability. Composition-wise, AMS 4674 is composed of 25% nickel, 6% molybdenum, 1.6% titanium, and 1.3% aluminium, making it an ideal alloy for critical components in the aerospace, oil and gas, and power generation industries. Additionally, the material is highly stable, corrosion-resistant, and can withstand high temperatures and fatigue. It’s widely used in manufacturing critical components such as hydraulic flanges and gear systems. With the right heat treatment, AMS 4674 can achieve mechanical properties such as high tensile strength, yield strength, and hardness. Overall, AMS 4674 is a versatile, high-performance material that is preferred for applications that demand high strength, corrosion resistance, and excellent machinability.

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