Corrosion Resistant Alloys

NAS 329J3L

  • JISSUS 329J3L
  • UNSS31803 ・ S32205
  • DIN/EN1.4462
Duplex Stainless Steel

NAS 329J3L (SUS 329J3L, UNS S32205, S31803) is an Austenitic-ferritic stainless steel, which has superior corrosion resistance and high strength. It has better localized corrosion resistance than Type 316L and 317L, and the steel is applied in the industrial fields like chemical plant, seawater desalination plant, seawater pump, and so on. Nippon Yakin supplies this product in plate, sheet and strip form.

Products & Materials

NAS 329J3LProductsPDF(392KB)

Chemical Composition 22Cr-5.3Ni-3.2Mo-0.16N
Product shape
Workability High temperature strength is similar to Type 430 in the range of 950~1150℃. However the steel shows rapid increase in the strength below 900℃. Regarding cold workability, care is required as proof stress is high and elongation is low in comparison with Type 304.
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. Use of welding electrodes for UNS S32205 is recommended. Preheating and postheating are not necessary. In welding, the interpass temperature should be no more than 100℃ in order to prevent formation of intermetallic compounds.
Heat Treatment Solution annealing of NAS 329J3L should be performed at 1040℃ and higher followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M)
Pickling A mixture of nitric acid and fluoric acid is used in pickling. However, because descaling is somewhat difficult in comparison with Type 304, alkali immersion before acid pickling, and if possible, shot blasting are extremely effective.
Applications •Chemical Plant, Chemical Tanker
•Seawater desalination Plant, Seawater pump
•Thermal power plant flue gas desulfurization plants
•Pulp and paper plants
Certification It is possible to manufacture UNS S32205/S31803 in accordance with the NORSOK standard below. The thickness is up to 50mm.