Corrosion Resistant Alloys

NAS354N

  • JISー
  • UNSN08354
  • DIN/ENー
Super Austenitic Stainless Steel

NAS354N (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 NAS354N 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.

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Chemical Composition 23Cr-35Ni-7.5Mo-0.2N
Product shape
CoilCoil
SheetSheet
PlatePlate
Workability The hot and cold workability of NAS354N 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 NAS354N 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 NAS354N, 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 Chemical plants, Food manufacturing plants, Salt manufacturing plants, Heat exchangers, Marine structures, Environment-related equipment.