Corrosion Resistant Alloys
NAS 354N
- JISー
- UNSN08354
- DIN/ENー
Super Austenitic Stainless Steel
NAS 354N (UNS N08354, ASME Code Case 2585-1) is a super austenitic stainless steel with excellent corrosion resistance in various environments. The high chromium, molybdenum and nitrogen contents provide high resistance to crevice and pitting corrosion in oxidizing chloride environments while the high nickel content enhances resistance to stress corrosion cracking. The corrosion resistance of NAS 354N exceeds the conventional 6 Mo super austenitic stainless steels because of containing 7.5% Mo. Nippon Yakin supplies this product in plate, sheet and strip form.
| Chemical Composition | 23Cr-35Ni-7.5Mo-0.2N |
|---|---|
| Product shape |
 Coil Sheet Plate |
| Workability | The hot and cold workability of NAS 354N is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316, etc. However, the fact that this is a high strength material must be considered in both cold and hot working. |
| Weldability | Various welding methods are applicable in the same manner as with the standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. Alloy 276 welding consumable should be used. |
| Machinability | As a feature of high Ni stainless steels, although machining is difficult in comparison with the standard austenitic stainless steels, it is easier than with Ni-based alloys. A ultrahard tool should be used in machining if at all possible. It is also advisable to use a slower feed rate and deeper cutting depth. |
| Heat Treatment | Solution annealing of NAS 354N is normally performed at the temperature range from 1125 to 1175℃ 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 354N, 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 | •Seawater environments: Marine structures, heat exchangers using seawater etc. •Food product plants: Dressing manufacturing equipment, etc. •Incinerator: Waste gasification plant |