| Workability | The hot and cold workability of NAS 185N 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. |
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| 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. |
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| 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. |
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| Heat Treatment | Solution annealing of NAS 185N should be performed at 1150℃ and
higher followed by being quenched in water or rapidly cooled by
other means. (Conditions provided in ASTM A480/A480M) |
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| Pickling | A mixture of nitric acid and hydrofluoric acid is used in pickling.
However, due to the high corrosion resistance of NAS 185N, 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. |
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| Applications | - Seawater environments: Marine structures, seawater desalination
systems, heat exchangers using seawater, condenser tubes, etc.
- Pulp and paper plants: Various types of bleaching systems,
scrubbers, etc.
- Medical and pharmaceutical product plants: Centrifugal separators,
reaction tanks, etc.
|
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| Certification | It is possible to manufacture UNS S31254 in accordance with the
NORSOK standard below. The thickness is up to 40mm. - NORSOK M-650
- NORSOK M-630 MDS R15
|
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