Nimonic 80A and Nimonic 75 are both high-performance nickel-based superalloys, but they have some distinct differences in their composition and properties:

Nimonic 80A:

  1. Composition: Nimonic 80A is primarily composed of nickel (Ni), with significant additions of chromium (Cr) and aluminum (Al). It also contains titanium (Ti) and minor elements like carbon (C) and iron (Fe).
  2. Properties:
  • High Temperature Strength: Nimonic 80A is known for its excellent strength at elevated temperatures, making it suitable for high-stress applications in aerospace and gas turbine engines.
  • Oxidation Resistance: It has good oxidation and corrosion resistance at high temperatures, which is crucial for its applications.
  • Fabrication: Nimonic 80A can be readily fabricated using traditional methods like forging and machining.

Nimonic 75:

  1. Composition: Nimonic 75 is also a nickel-based alloy but with a different composition compared to Nimonic 80A. It contains nickel as the base metal, with additions of chromium, iron, and other elements like titanium and carbon.
  2. Properties:
  • High Temperature Strength: Nimonic 75 also offers good strength at elevated temperatures, although typically not as high as Nimonic 80A.
  • Oxidation Resistance: It provides good oxidation resistance, suitable for high-temperature environments.
  • Applications: Nimonic 75 is used in applications where moderate strength and oxidation resistance are required, such as in aerospace components and high-temperature fasteners.


  • Strength at High Temperatures: Nimonic 80A generally offers higher strength compared to Nimonic 75, particularly at temperatures exceeding 1000°C.
  • Applications: Nimonic 80A is often chosen for more demanding applications where superior high-temperature strength and oxidation resistance are critical. Nimonic 75, while also suitable for high-temperature environments, is typically used in applications that do not require the highest strength levels.
  • Cost and Availability: Nimonic 75 may be more cost-effective and more readily available in certain markets compared to Nimonic 80A, depending on the specific application requirements.

In summary, the choice between Nimonic 80A and Nimonic 75 depends on the specific application needs, particularly focusing on temperature requirements, strength levels, and environmental conditions such as oxidation resistance.