Nimonic alloy 90

  • Precipitation hardenable
  • Great oxidation and creep resistance
  • Impressive strength at high temperature
  • Resistant to corrosive environments
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Nimonic 90 is a superalloy with Nickel, Cobalt, and Chromium as its base metals. It is a precipitation-hardenable alloy with excellent resistance against corrosive and oxidizing agents. Also, it exhibits terrific strength at temperatures as high as 704°C.

Being able to withstand heat, this alloy is preferred in numerous heat treatment industries, as well as in those industries that work with caustic or corrosive agents. It can be found in aerospace, gas and oil, and nuclear industries.

Common Names:

  • UNS N07090
  • Nr. 2.4632

Executive Standards:

Rod, Bar, Wire and Forging Stock

  • BS HR2
  • BS HR501-503
  • AMS 5829
  • AECMA PrEN 2295-2296
  • AECMA PrEN 2400-2401
  • AECMA PrEN 2669-2670
  • MSSR 7016
  • MSSR 7137
  • ABB Stal 63 73 01

Plate, Sheet, and Strip

  • BS HR202
  • MSRR 7087
  • AECMA PrEN 2298
  • SEIMENS TLV8525 2100
  • SEIMENS TLV8525 31001

Pipes and Tubes

  • BS HR 402
  • AECMA PrEN 2299

Chemical Properties:

Chromium (%)18-21
Cobalt (%)15-21
Iron (%)Max 3
Titanium (%)1.8-3.0
Silicon (%)Max 1.5
Manganese (%)Max 1.0
Others (%)Remainder

Mechanical Properties:

0.2% Yield Strength (MPa)695
Tensile Strength (MPa)1175
Tensile strength (103 ksi)170
Elasticity Modulus (GPa)220
Elasticity Modulus (psi)3.2 x 106
Break Elongation30%



Physical Properties:

Expansion Coefficient70-1000oF8.2
Modulus of rigiditypsi11.9 x 103
Thermal ConductivityW/m-K11.47
Melting pointoF2450

Key Features:

  • High-temperature tolerance: This Nimonic alloy can withstand high temperatures without creeping and cracking, which makes it stand out amongst the other alloys.
  • High strength: Nimonic alloy 90 is a very strong alloy, and what’s brilliant about this material is that it retains strength even in very hot temperatures, whereas most metals fail to survive. Hence, industries with machines operating at such temperatures make use of this alloy extensively.
  • Resistance to corrosion and oxidation: Even when the environment is highly caustic, Nimonic 90 doesn’t give up. This alloy resists all forms of corrosive acids and gases and also prevents oxidation from hindering its performance.

Product Forms Available:

  • Bars
  • Rods
  • Wires
  • Plates
  • Sheets
  • Extrusions
  • Pipes


  • Gas turbine components
  • Aerospace engineering
  • Chemical processing
  • Piping systems
  • Oil and gas industry

Possible Alternate Grades:

  • Nimonic 75: This Nimonic alloy is excellent in corrosion resistance and provides excellent scaling resistance even at high temperatures. It is durable and easily weldable.
  • Nimonic 80A: It is a stable alloy with high heat tolerance. It offers excellent tensile and creep-rupture properties at higher temperatures.

Frequently Asked Questions:

  • How can Nimonic 90 be annealed?

Annealing of Nimonic 90 must be carried out at 1080°C (1975°F) for 8 hours, followed by cooling.

  • How can this alloy be hardened?

This Nimonic alloy can be hardened by cold working.

  • Suggest some welding techniques suitable for Nimonic 90 alloy.

Welding of Nimonic 90 can be done by Shielded Metal-Arc Welding, Gas-Tungsten Arc Welding, Gas Metal-Arc Welding, and Submerged-Arc Welding methods.

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