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Nickel Alloy 901 (AMS 5660, AMS 5661, BS HR55) is a nickel-based alloy offering high strength and outstanding resistance to corrosion and oxidation at extreme temperatures. Primarily composed of nickel, along with substantial amounts of chromium and smaller additions of iron and silicon, this alloy is exceptionally versatile for demanding industrial applications.

Its standout quality is retaining high strength and stability in temperatures up to 600°C. This allows Nickel Alloy 901 to withstand incredibly hot and arduous environments that would cause most other metals to fail or rapidly degrade. Components made from this alloy maintain their integrity despite continuous exposure to hot gases, combustion products or thermal cycling.

This capability stems from the carefully balanced composition of Nickel Alloy 901. The high nickel content coupled with generous chromium provides a protective chromium oxide layer on the metal's surface when heated, shielding it from oxidation damage. The addition of silicon enhances this protective effect and the iron helps fine-tune the physical properties of the alloy. Combined, these elements allow Nickel Alloy 901 products to continuously perform in the hottest sections of industrial plants, power generation equipment and vehicle engines.

Potential applications that could benefit from Nickel Alloy 901's thermal and corrosion resistance include furnace components, parts for aircraft and land-based gas turbines, rocket engine nozzles, nuclear power systems, heat exchangers and any component facing extremely high heat.

Specific Gravity

8.14 g/cm3

Typical Applications

Related Specifications


Rocket Engines

Gas Turbine Components

Furnace Components


AMS 5660

AMS 5661


US NO9901



Chemical Composition (Wt %)

  Ni Cr Si S Co FE Al C Mn Mo Ti Cu
Min 40 11 - - - Bal - - - 5 2.8 -
Max 45 14 0.4 0.03 1   0.35 0.1 0.5 6.5 3.1 0.5

Typical Mechanical Properties
(in the solution treated condition)

0.2% Proof Stress Tensile Strength Elongation Reduction
862 1207 15 19

Alloy 901 is a nickel-based alloy, that offers high strength and resistance to corrosion and oxidation at high temperatures. Typical applications are Aircraft parts, rocket engines, gas turbine components and furnace components. 

Alloy 901 is mainly nickel, iron and chromium, which also contains Titanium and Aluminium for precipitation hardening and molybdenum for strength.

Typical uses include Aircraft parts, Rocket Engines, Gas Turbine Components, Furnace Components. Alloy 901 is mainly used for components facing extremely high heat.

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