UNS N07090, Alloy 90, W.Nr. 2.4632, Nimonic® 90
Note that the designation “ Nimonic®” is registered trademarks of Special Metals Corporation group of companies.
UNS N07090 is a wrought nickel-chromium-cobalt base alloy strengthened by additions of titanium and aluminum. It has been developed as an age-hardenable creep- resisting alloy for service at temperatures up to 920°C (1688°F). The alloy has high tensile strength and creep resistance, good oxidation resistance and corrosion resistance in 815~870°C, high fatigue strength and good formability and weldability under the action of repeated cold and heating.
| Material | Ni | C | Si | Cu | Fe | Mn | Cr | Ti |
|---|---|---|---|---|---|---|---|---|
| N07090 | Balance | 0.13 max | 1.00 max | 0.20 max | 1.50 max | 1.00 max | 18.0-21.0 | 2.00-3.00 |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| N07090 | 850-1000 N/mm² | 400-6005 N/mm² | 30-40% | 200-250 |
Nimonic 90 offers a balance of corrosion resistance and high-temperature strength. The resistance to high-temperature oxidation, corrosion in both acidic and alkaline solutions, and stress corrosion cracking of Nimonic 90 makes it suitable for various environments. Also, the alloy demonstrates resistance to pitting and crevice corrosion in chloride-containing environments, but its performance can be compromised in highly oxidizing or reducing conditions. It is important to consider the specific environment and application requirements when selecting Alloy 90.
Nimonic 90 is heat treated by annealing at 1080°C (1975°F) for 8 h followed by cooling, to optimize its mechanical properties and achieve desired characteristics.
Heating of Nimonic 90 involves subjecting the material to elevated temperatures for various purposes such as heat treatment, forming, or joining processes.The specific heating temperature and duration depend on the intended outcome and the specific application requirements, to ensure the material's integrity, and optimize its mechanical properties, and prevent potential damage or degradation during the heating process.
Pickling of Nimonic 90 involves the use of appropriate acidic solutions to remove impurities, scale, or oxides from the surface of the material. However, it is crucial to consider the compatibility between the pickling solution and Alloy 90 to avoid any adverse effects such as corrosion or surface damage. Proper pickling can help achieve a clean and corrosion-resistant surface finish, preparing the material for subsequent processing or application.
Nimonic 90 should be hot formed in the range 1050-1200°C (1922-2192°F). After the hot forming process, the alloy is cooled slowly to relieve residual stresses and stabilize the microstructure.
Nimonic 90 is not typically recommended for extensive cold forming operations due to its limited ductility at room temperature, but can undergo limited cold forming operations such as bending or minor shaping, especially for smaller and less complex components.
Nimonic 90 can be machined using conventional methods which are used for iron-based alloys, and the alloy should be in the fully heat-treated condition for all machining operations. The high material hardness in this condition, 250-350 HV, requires the use of stringent machining techniques. Please note, machining operations are performed using commercial coolants.
Solution treated material is suitable for welding, and a post-weld heat treatment is required to achieve optimum results. Nimonic 90 can be welded using conventional welding techniques, such as shielded metal-arc welding, gas-tungsten arc welding, gas metal-arc welding, and submerged-arc welding methods.
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