ThePipingMart Blog Grades Nimonic Alloy 75 (UNS N06075) – Composition, Properties, and Uses

Nimonic Alloy 75 (UNS N06075) – Composition, Properties, and Uses

Nimonic 75

In engineering, selecting a suitable material is crucial in ensuring the final product’s high performance, reliability, and durability. One such material that has gained popularity among industry experts is Nimonic 75. Nimonic 75 is a nickel-chromium alloy known for its excellent mechanical and physical properties. This blog post will closely examine this alloy’s composition, mechanical properties, heat treatment, welding, and various applications.

What is Nimonic 75?

Nimonic 75 is a nickel-chromium alloy designed for high-temperature stress and strain applications with good strength, ductility and oxidation resistance. It also has excellent creep rupture properties up to 1300°C (2372°F). Furthermore, it has a thermally stable microstructure over a wide temperature range, making it suitable for use in gas turbines and industrial furnace components.

Nimonic 75 Composition

Nimonic 75 is a nickel-chromium alloy that contains aluminium and titanium as well. It is also known as Nimonic Alloy 75, and the composition is primarily made up of 80% nickel, 20% chromium, and small amounts of aluminium, titanium, and carbon. This alloy has a high melting point and can withstand high-temperature environments of up to 1100℃.

Element Content (%)
Nickel, Ni Remainder
Chromium, Cr 18-21
Iron, Fe 5.00 max
Silicon, Si 1.00 max
Manganese, Mn 1.00 max
Titanium, Ti 0.2-0.6
Copper, Cu 0.5
Carbon, C 0.08-0.15

Nimonic 75 Mechanical Properties

One of the most significant advantages of Nimonic 75 is its excellent mechanical properties. This alloy possesses incredible tensile strength and can withstand high-stress environments. The alloy yields 550 MPa, and the ultimate tensile strength is around 880 MPa. Nimonic 75 also exhibits good creep resistance, making it an ideal alloy in applications where high-temperature environments and stresses are present.

Properties Metric Imperial
Tensile strength(annealed) 750 MPa 109 ksi
Yield strength(annealed) 275 MPa 40 ksi
Elongation at Break 42% 42%
Modulus of Elasticity 206 GPa 29878 ksi

Nimonic 75 Physical Properties

In addition to its excellent mechanical properties, Nimonic 75 has impressive physical attributes. This alloy is non-magnetic and has a density of 8.37 g/cm³. It is also very resistant to corrosion and oxidation, making it an ideal choice in many aircraft and gas turbine engine applications.

Nimonic 75 Equivalents

  • UNS N06075
  • BS HR5
  • HR203
  • HR403
  • HR504
  • DIN 17742
  • DIN 17750-17752

Nimonic 75 Uses

The unique combination of properties of Nimonic 75 makes it an ideal material for use in various high-performance applications. This alloy is widely used in aerospace applications requiring high-temperature resistance, including turbine blades, exhaust system parts, and nozzle guide vanes. Nimonic 75 is also used in nuclear engineering, petrochemicals, and power generation.

Nimonic 75 Corrosion Resistance

Another notable feature of Nimonic 75 is its excellent resistance to corrosion and oxidation. This makes it an ideal choice for applications where exposure to high temperatures and reactive environments is a concern. The alloy is particularly useful in aircraft and maritime applications.

Nimonic 75 Heat Treatment

Nimonic 75 must undergo heat treatment for the best results after moulding into the desired shape. Heat treatment is necessary to enhance the physical and mechanical properties of the alloy. The heat treatment process is usually completed in two stages. The alloy is heated to around 815℃ in the first stage, while in the second stage, it is cooled in air or water.

Nimonic 75 Machining

Machining Nimonic 75 can be difficult due to its high hardness levels. However, it is possible to machine this alloy with the right equipment. Carbide tools are typically used, and the cutting speed should be as low as possible. The feed rate should also be reduced to prevent the material from chipping.

Nimonic 75 Welding

Nimonic 75 is a nickel-chromium alloy designed to resist creep at high temperatures up to 816°C. Its excellent weldability and corrosion resistance make it an ideal candidate for welding applications in the aerospace and power generation industries.


Nimonic 75 is a nickel-chromium alloy that has gained widespread use in the industry due to its unique properties. It has excellent mechanical and physical properties, including high-temperature resistance, corrosion resistance, and impressive tensile strength. It has many applications, including in the aerospace, petrochemical, and power generation industries. Nimonic 75 can be challenging to machine, but with the right equipment, it is possible to achieve the desired results. Overall, Nimonic 75 is a high-performance alloy sought-after material in various industries.

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