UNS N07080, Alloy 80A, W.Nr. 2.4631, Nimonic® 80A
Note that the designation “ Nimonic®” is registered trademarks of Special Metals Corporation group of companies.
UNS N07080 is a wrought, age-hardenable nickel-chromium alloy, strengthened by additions of titanium, aluminum and carbon, developed for service at temperatures up to 815°C (1500°F). It is produced by high-frequency melting and casting in air for forms to be extruded.
| Material | Ni | C | Cr | Si | Cu | Fe | Mn | Ti |
|---|---|---|---|---|---|---|---|---|
| N07080 | Balance | 0.10 max | 18.0-21.0 | 1.00 max | 0.20 max | 3.00 max | 1.00 max | 1.80-2.70 |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| N07080 | 800-1000 N/mm² | 550-750 N/mm² | 30-40% | 200-250 |
Nimonic 80A exhibits good corrosion resistance, particularly in high-temperature and corrosive environments. It demonstrates excellent oxidation resistance, making it suitable for high-temperature applications. Alloy 80A also withstands attack from acidic and alkaline environments, making it suitable for chemical processing. Additionally, it has resistance to stress corrosion cracking, making it suitable for applications under combined stress and corrosive conditions.
Nimonic 80A can undergo heat treatment to achieve desired mechanical properties and optimize its microstructure. Heat treatment processes typically involve heating the material to specific temperatures, holding it at those temperatures for a certain period, and then cooling it at a controlled rate. E.g, for extruded bar 8h/1080°C (1976°F)/air cool + 16h/700°C (1292°F)/air cool. For cold rolled sheet 2-3 minutes/1150°C (2102°F)/ fluidized bed quench + 20 minutes/1040°C (1904°F)/air cool+4h/750°C(1382°F)/air cool.
Nimonic 80A can be subjected to heating processes, such as heat treatment, by following recommended temperature and time parameters to achieve desired properties. Pickling using compatible acidic solutions can also be performed to remove impurities, but caution must be exercised to prevent corrosion or surface damage. It is crucial to refer to technical data, manufacturer guidelines, and seek expert advice to ensure appropriate procedures and minimize the risk of detrimental effects.
Nimonic 80A can be both hot and cold formed, but the specific forming processes and parameters will depend on the desired shape, size, and properties required for the application.
Hot Forming: Nimonic 80A is typically more ductile and easier to form at elevated temperatures. Hot forming processes include techniques such as hot forging, hot rolling, and hot extrusion. The material is heated to a temperature within the range of approximately 950 to 1150°C (1742 to 2102°F) to enhance its plasticity and enable shaping into the desired form. Proper control of the heating temperature and cooling rate after forming is essential to maintain the desired properties of the material.
Cold Forming: Nimonic 80A can also be cold formed, although it is generally more challenging due to its high strength and limited ductility at room temperature. Cold forming processes include techniques such as cold rolling, cold drawing, and cold bending. The material is subjected to mechanical forces at or near room temperature to shape it into the desired form. Cold forming of Alloy 80A may require specialized equipment, tooling, and lubrication to minimize the risk of cracking or material failure.
Nimonic 80A should be in the fully heat treated condition for all machining operations. The high material hardness in this condition requires the use of stringent machining techniques.
Nimonic 80A is readily joined by any of the resistance welding processes. For section thicknesses up to about 5 mm, fusion welding by conventional processes such as T.I.G. or M.I.G. is satisfactory. For section thicknesses greater than 5 mm, electron beam, friction, inertia and flash-butt welding have all been successfully used. The normal precautions for welding nickel alloys should be observed and welding should be carried out on solution treated material. Post-weld heat treatment is necessary to achieve optimum properties.
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