Duplex & Super Duplex — Sheets, Plates, Pipes, Fittings & Flanges
Two-phase stainless steels with twice the strength of 316L and strong chloride resistance. Choose a grade below for its standards, chemistry, properties and every product form we supply.
- 2205
- 2507
- S32760
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
How Duplex & Super Duplex Grades Differ
Within a family, nickel, chromium and molybdenum set most of the difference in corrosion resistance and cost. The left chart shows the specified range of each; the right ranks the grades by approximate PREN (pitting resistance), a quick screen for chloride service.
Pitting Resistance (PREN)
Duplex & Super Duplex Grades Compared: Standards & PREN
| Grade | Sheet & plate | Pipe | Fittings | Flanges | PREN |
|---|---|---|---|---|---|
| Duplex 2205 | ASTM A240 | ASTM A790 | ASTM A815 WPS31803 / WPS32205 | ASTM A182 F51 / F60 | ≈ 35 |
| Super Duplex 2507 | ASTM A240 | ASTM A790 | ASTM A815 WPS32750 | ASTM A182 F53 | ≈ 42 |
| Super Duplex S32760 | ASTM A240 | ASTM A790 | ASTM A815 WPS32760 | ASTM A182 F55 | ≈ 41 |
Products in duplex & super duplex
Duplex & Super Duplex for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiDuplex & Super Duplex — questions buyers ask
Which duplex & super duplex grades do you supply?
Duplex 2205, Super Duplex 2507, Super Duplex S32760, in the forms listed on each grade page.
How do I choose between these grades?
Start with the medium, temperature and pressure. The comparison table on this page ranks the grades by pitting resistance and typical use; send us your process conditions for a recommendation.
Do you export?
Yes — to the Gulf, South-East Asia, South America, Europe, the UK and the USA, FOB or CIF from Nhava Sheva, Mumbai.