Valves in Super Duplex A182 F53, F55, A890 Gr. 5A and A995 Gr. 6A valves and their use.
With a 25% Cromium component, super duplex valves are designed to withstand seawater corrosion and other intergranular corrosion and pitting.
Duplex material specification and equivalents
| Forged | A182 F53 and F55 |
| Cast designation up to 1998 | A890 Gr. 5A and 6A |
| Cast designation since 1998 | A995 Gr. 5A and 6A (Supercedes A890) |
| ASTM specification | A351 CE3MN and CD3MWCuN |
| European (DIN) Werkstoff number | 1.4410 and 1.4501 |
| Unified Numbering System (UNS) | S32750 and S32760 |
| Type | X2CrNiMoN25.7.4 |
