UNS N07263, Alloy 263, W.Nr. 2.4650, Nimonic® 263
Note that the designation “ Nimonic®” is registered trademarks of Special Metals Corporation group of companies.
UNS N07263 is a nickel-based superalloy known for its exceptional strength, high-temperature resistance, and excellent corrosion resistance. Developed for applications requiring high strength and oxidation resistance at elevated temperatures, Nimonic 263 offers a combination of mechanical properties and thermal stability. Also, the alloy exhibits good weldability, allowing for the fabrication and joining of components using various welding processes.
| Material | Ni | Co | Cr | Mo | Ti | Fe | Mo | Si |
|---|---|---|---|---|---|---|---|---|
| N07263 | Balance | 19.0-21.0 | 19.0-21.0 | 5.60-6.10 | 1.90-2.40 | 0.70 max | 0.60 max | 0.40 max |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| N07263 | 830-103 N/mm² | 515 N/mm² | 25-305% | 190-230HB |
Nimonic 263 exhibits excellent corrosion resistance, making it suitable for use in environments with high-temperature oxidation and corrosion challenges. The alloy's nickel, chromium, and molybdenum content contribute to its resistance to a wide range of corrosive media, including gases, chemicals, and high-temperature atmospheres. Alloy 263 forms a protective oxide layer on its surface, which helps prevent further oxidation and degradation.
Nimonic 263 can undergo a heat treatment process to optimize its mechanical properties and enhance its performance. The typical heat treatment involves a solution treatment followed by age hardening. During the solution treatment, the alloy is heated to a temperature between 1090°C (1994°F) and 1140°C (2084°F) and then rapidly cooled to homogenize its microstructure. Subsequently, the age hardening process involves heating the material at around 760°C (1400°F) for a specified time, followed by controlled cooling. This step allows the formation of fine precipitates, enhancing the alloy's strength and creep resistance at high temperatures.
Nimonic 263 should be heated gradually and uniformly to minimize thermal stress and distortion. The recommended heating temperature between 1090°C (1994°F) and 1140°C (2084°F). It is essential to closely monitor the temperature using accurate instrumentation to prevent overheating, which could lead to grain growth or other detrimental effects. After the desired temperature is reached, the material can be held at that temperature for the specified duration to allow for proper solutionizing.
Nimonic 263 is a nickel-based superalloy, generally does not require pickling as it exhibits excellent corrosion resistance. However, in certain cases where surface contaminants or oxides need to be removed, a pickling process can be considered. Pickling should be performed carefully to avoid excessive material removal or etching. Additionally, the pickling process should be followed by appropriate passivation or neutralization treatments to restore the surface integrity and corrosion resistance of the Alloy 263 component.
Nimonic 263 may be hot formed in the temperature range 950-1150°C. It is crucial to heat the material uniformly and maintain a consistent temperature throughout the forming process to ensure proper workability and minimize the risk of cracking or distortion.
Due to Nimonic 263 has high strength and limited ductility at lower temperatures, the cold forming operations such as cold rolling, cold drawing, or cold bending are not commonly employed for it, the alloy's low ductility at room temperature makes it prone to cracking and failure during cold forming processes.
The high strength and work-hardening tendency of Nimonic 263 make it more difficult to machine compared to standard materials. It has a tendency to work harden during machining, which can lead to increased cutting forces, tool wear, and surface roughness. Therefore, Machining Alloy 263 requires the use of appropriate cutting tools, techniques, and cutting parameters to achieve satisfactory results. In addition, the high temperature resistance of Alloy 263 requires the use of cutting fluids or coolants during machining to dissipate heat effectively and prevent thermal damage to the workpiece and cutting tools.
Nimonic 263 is readily welded. TIG processes, MIG processes, resistance spot, stitch, seam welding, high-temperature brazing, electron-beam welding, plasma-arc welding and many other joining process are available for Alloy 263, but the choice of any one will depend on the application and the equipment available. For example, flash-butt welding is used for the manufacture of gas turbine rings, but finds little application elsewhere.
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