Leading Supplier of SUS329J4L
SUS 329J4L also equivalent to
ASTM A240 S31260
Properties of S31260
A duplex stainless steel having resistance to chloride-ion corrosion. It has excellent resistance to pitting corrosion and stress-corrosion cracking in hot seawater.
SUS329J4L equivalent to ASTM A240 S31260 is selected for the candidate material of canister for the dry interim storage of spent fuels, for that shows excellent hot workability to manufacture into wide and thick plate and good corrosion resistance for canister usage at the present time.
In order to improve the corrosion resistance, toughness and electron beam weldability which is applicable in future, candidate steel is investigated to obtain the suitable chemical compositions within the specification requirements, and the following results are obtained.
(1) Some experimental alloys were melted in the laboratory to obtain the best balance of N and Ni contents for suitable toughness and corrosion resistance, as the contents of Cr and Mo contributed for corrosion resistance are maintained at upper limit of the specification requirements. The best balance is obtained more than 0.2 mass% in N and more than 6.5 mass% in Ni within the specification requirements.
(2) The practical hot rolled plate melted with suitably selected compositions at 3m in wide and 20mm in thickness was manufactured with no defects in spite of higher nitrogen contents. The improved plate has satisfactory strength, high toughness and excellent corrosion resistance equivalent to austenitic super stainless steels.
Workability of SS 329J4L
High temperature strength is similar to SUS 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 SUS 304
Weldability for SS329J4L
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. Same duplex grade type welding consumable should be used.
Pickling for SUS 329J4L
A mixture of nitric acid and fluoric acid is used in pickling. However, because descaling is somewhat difficult in comparison with SS304, alkali immersion before acid pickling, and if possible, shot blasting are extremely effective.
Applications in SUS329J4L
SUS329J4L / S31260 can be used in various types of pollution prevention equipment, Chemical and petrochemical plant, Pulp and paper plant, Equipment handling sea water, Water gate, etc.