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

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