Corrosion Resistant Alloys
NAS 335X
- JISー
- UNSN08020
- DIN/ENー
NAS 335X is a stainless steel with extremely high corrosion resistance to sulfuric acid. It can be used in a wide range of sulfuric acid environments, including high concentration, high temperature environments. It possesses excellent intergranular corrosion resistance and stress corrosion cracking resistance.
| Chemical Composition | 20Cr-33Ni-2.5Mo-3Cu-0.4Nb |
|---|---|
| Product shape |
 Coil Sheet Plate |
| Workability | Cold and hot workability are approximately equal to those of Type 304, 316, and other standard austenitic stainless steels. |
| Weldability | TIG welding, MIG welding, and shielded metal arc welding are applicable in the same manner as with standard austenitic stainless steels. However, because NAS 335X is an Nb-added stainless steel, the welding heat input should be reduced as far as possible. Use of ER320 or ER320LR welding electrodes is recommended. |
| Machinability | The machinability of NAS 335X is basically the same as that of standard austenitic stainless steels. In machining, a high speed steel tool or ultrahard tool should be used. It is also advisable to use a slower feed rate and deeper cutting depth. |
| Heat Treatment | Stabilizing heat treatment of NAS 335X should be performed at the temperature range from 925 to 1010℃ followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M) |
| Pickling | Pickling is performed under the same conditions as with Type 304, using a mixture acid of nitric acid and hydrofluoric acid. |
| Applications | Sulfuric acid plants, various types of chemical and petrochemical plants |