ThePipingMart Blog Grades AMS 6471 Alloy Steel – Composition, Properties and Uses

AMS 6471 Alloy Steel – Composition, Properties and Uses

AMS 6471

AMS6471 is a specially formulated steel alloy with unique properties, making it an ideal material for various industrial applications. This aerospace-grade alloy is known for its high strength, durability, and toughness. This blog post will delve into the composition, physical and mechanical properties, and heat treatment of AMS6471. We will also discuss its uses and importance in modern-day engineering. So, let’s explore the fascinating world of AMS 6471 together.

What is AMS 6471?

AMS 6471 ( also known as Nitralloy 135 Alloy) is a low-alloy steel containing molybdenum and chromium. This high-strength steel is incredibly durable and has excellent corrosion resistance, making it a popular choice for numerous applications, including aircraft landing gear, suspension systems, and crankshafts. AMS6471 metal’s unique properties allow it to withstand extreme temperatures and high stress, making it an excellent option for industries that require high-performance materials. With its outstanding performance and long-lasting durability, it’s no wonder why AMS 6471 metal is known as one of the most reliable materials in the market.

AMS 6471 Composition

AMS 6471 comprises iron, carbon, manganese, chromium, molybdenum, and vanadium as its primary elements. The alloy is known for its excellent weldability, and its composition maintains its strength and toughness even after welding. The balanced composition of AMS 6471 also ensures that it is machinable, which is crucial for industrial applications that require precision machining.

Element % Content
Carbon 0.40
Manganese 0.60
Silicon 0.30
Chromium 1.60
Molybdenum 0.35
Aluminum 1.20

AMS 6471 Physical Properties

AMS 6471 has a density of 7.85 g/cm3, and its melting point is around 1480°C (2696°F). It has excellent resistance to corrosion, oxidation, and wear and tear, which makes it a preferred choice for use in sea and aerospace applications. AMS 6471 has a low thermal expansion coefficient and good thermal conductivity, making it a suitable material for high-temperature applications.

Density (lbs/cubic in) Electrical conductivity (% IACS) Thermal conductivity (BTU-in/hr-ft²-°F) Specific heat capacity Thermal expansion (1/°F) Melting Point (°F)

AMS 6471 Mechanical Properties

AMS 6471 has excellent mechanical properties thanks to its composition. It has a tensile strength of 1350 MPa (196 ksi), 1200 MPa (174 ksi) yield strength, and a high toughness value. These properties make AMS 6471 ideal for critical industrial applications requiring high strength and durability. AMS 6471 also exhibits good flexibility and impact resistance.

Yield Strength Range (Rp0.2 Offset) (ksi)
Tensile Strength Range (Mpa) 760 930
Elongation 50%
Hardness (HBW) 280 340
Modulus of Elasticity (ksi) (E): –
Machineability General Index: –

AMS 6471 Uses

Due to its exceptional mechanical and physical properties, AMS 6471 has various uses across several industries. It is used in the aerospace industry to manufacture high-stress parts such as landing gears, aircraft engines, and structural components. AMS 6471 is also used in the oil and gas industry to manufacture heavy-duty drill bits, drilling tools, and other critical components in harsh environments. The material is used to manufacture mining equipment, high-performance bolts, and other industrial hardware.

AMS 6471 Hardness

AMS 6471 is a high-strength steel alloy with a Rockwell hardness of 55HRC, significantly harder than most other alloys. The hardness results from the carefully composed elements, making it an ideal candidate for high-stress applications requiring reliable mechanical properties.

AMS 6471 Heat treatment

To optimise its mechanical properties, AMS 6471 can undergo different heat treatments, including quenching, tempering, and annealing. Depending on the application, the alloy can be heat-treated to enhance its strength, flexibility, toughness, and other properties, making it adaptable to diverse industrial requirements.


In conclusion, AMS 6471 material is a fantastic alloy with exceptional mechanical and physical properties, making it a preferred material for critical industrial applications. Its exceptional weldability, machinability, resistance to corrosion, and thermal conductivity make it a versatile solution for various industries, including aerospace, oil and gas, mining, and others. The careful composition and heat treatment of AMS 6471 ensures that engineering needs are met while maintaining the highest reliability, safety, and efficiency.

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