Corrosion Resistant Alloys
NAS 825
- JISNCF 825
- UNSN08825
- DIN/EN2.4858
, comparable to Incoloy® 825 Alloy
NAS 825 (NCF 825, UNS N08825) is a high-Ni nickel alloy with high corrosion resistance, and possesses extremely high corrosion resistance against oxidizing and non-oxidizing acids. Nippon Yakin supplies this product in plate, sheet and strip form.
*Incoloy is a registered trademark of Special Metals Corporation.| Chemical Composition | 40Ni-23Cr-3Mo-2Cu-0.7Ti |
|---|---|
| Product shape |
 Coil Sheet Plate |
| Workability | Cold and hot workability are approximately equal to those of Type 304, 316, and other standard austenitic stainless steels. |
| Weldability | Possible welding methods include shielded metal arc welding, TIG welding, and MIG welding, in the same manner as with standard austenitic stainless steels. As welding consumables, Alloy 625, DNiCrMo-3 should be used. |
| Machinability | NAS 825 has machinability approximately equivalent to standard austenitic stainless steels. In machining, use of a high speed steel tool or superhard tool and a slow feed speed and large cut depth are advised. |
| Heat Treatment | Solution annealing of NAS 825 is normally performed at the temperature range from 930 to 1030℃ followed by being quenched in water or rapidly cooled by other means. |
| Pickling | A mixture of nitric acid and hydrofluoric acid is used in pickling. However, due to the high corrosion resistance of NAS 825, scale is somewhat difficult to remove in comparison with Type 304. Therefore, the material should be immersed in an alkaline solution before pickling, or if possible, shot blasting is extremely effective. |
| Applications | Oil drilling, chemical plants |