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Nimonic

The same team that worked on the development of the Whittle jet engine at the Wiggins facility in Hereford, England created Nimonic alloys. Composed of more than 50% nickel and 20% chromium with titanium and aluminium added in varying degrees to achieve further functionality, Nimonic alloys are used in both aerospace and many other applications today.

Properties

As you’d expect, these alloys were developed to withstand the higher temperatures and pressures experienced within jet engines, so they have been put to good use in industries with similar requirements. There are currently at least 13 variants of the alloy with different qualities, depending on their function.

Production

Created and trademarked by the Special Metals Corporation, Nimonic alloys demonstrate good ductility and malleability. In fact, Nimonic alloy 75 can be both cold and hot worked. It is subject to rapid strain hardening and because of its strength, large reductions can be made without rupture.

Nimonic can be welded through standard MMA, TIG, MIG and submerged arc processes.

Applications

High heat applications. Of course, Nimonic alloys are used extensively in the aerospace industry. It’s also used in the automotive, power generation and thermal processing sectors.

  • Power turbines
  • Exhaust systems
  • Ignition equipment
  • Springs
  • Solar engineering
  • Nuclear fission

Interesting Fact

Nimonic 263 was used in building the combustion engines for Concorde.

Properties of Supplied Materials and Heat Treated Materials

Condition of Supply Heat Treatment (After Forming)
Solution Annealed Age Harden at 750°C (1380°F) for 4 hours and air cool.
Spring Temper Age Harden at 650°C (1200°F) for 4 hours and air cool.
Spring Temper Age Harden at 600°C (1110°F) for 16 hours and air cool.

 

Condition Approx Tensile Strength Approx Service Temp.
Solution Annealed 800 – 1000 N/mm2 116 – 145 ksi - -
Solution Annealed + aged 1300 – 1400 N/mm2 189 – 203 ksi up to 550°C up to 1020°F
Spring Temper 1300 – 1500 N/mm2 189 – 218 ksi - -
Spring Temper + aged 1500 – 1800 N/mm2 218 – 261 ksi up to 350°C up to 660°F

 

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