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|