Duplex & Super Duplex Flanges

Offshore-Grade Flanges

Duplex & Super Duplex Flanges

Duplex 2205 & Super Duplex 2507 flanges for offshore, subsea and desalination piping connections.

Duplex & Super Duplex Flanges

ASTM / ASME Certified Material

Product Overview

Duplex and super duplex flanges connect the piping systems where chloride stress-corrosion cracking rules out standard austenitic stainless — offshore platforms, subsea manifolds and desalination plant.

We hold weld neck, slip-on and blind types in both 2205 and 2507, machined and faced to ASME B16.5 across the common pressure classes.

Size Range1/2″ – 24″
Pressure Class150 – 1500#
FacingRF, RTJ
MaterialsDuplex 2205, Super Duplex 2507

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Duplex & Super Duplex Flanges — In Our Stockyard

Specification

Flange Types & Standards

Type	Standard	Description
Weld Neck	ASME B16.5	High-pressure offshore & subsea connections
Slip On	ASME B16.5	Economical fitment for lower-pressure lines
Blind Flange	ASME B16.5	Line & vessel opening closure

Technical Data

Specifications

Size Range1/2″ – 24″
Pressure Class150# – 1500#
FacingRaised Face, RTJ
Material GradesS31803 / S32205, S32750

ManufactureForged, machined to ASME B16.5
TestingHardness, Ferrite Content, UT on request
CertificationEN 10204 3.1 Mill Test Cert.
PackingPalletised, bore-plugged for export

Technical Note — Ferrite balance is checked on every forging batch — offshore project specifications typically call for 35–55% ferrite, and we hold certification confirming this before flanges are released.

Where It's Used

Applications

Offshore Platforms

Subsea Pipelines

Desalination Plants

Chemical Processing

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