Duplex Steel Flanges

Duplex Steel Flanges for reliable pipe-to-pipe and pipe-to-equipment joints, available on MetalMitra in all standard face types and pressure classes to ASTM A182, with mill-certified traceability on every lot.

Duplex Steel Flanges are forged or machined components used to connect pipes, valves, pumps and equipment, allowing easy assembly, inspection and maintenance of piping systems.

Duplex stainless steel has a two-phase austenitic-ferritic structure that delivers higher strength than standard austenitic grades together with good resistance to pitting, crevice corrosion and chloride stress corrosion cracking.

Product range

• Weld Neck Flanges — Butt-welded flanges for high-pressure and high-temperature service.
• Slip On Flanges — Slip over the pipe for easy alignment and welding.
• Blind Flanges — Solid flanges used to close pipe ends and openings.
• Socket Weld & Threaded Flanges — Compact connections for smaller bore piping.
• Lap Joint Flanges — Used with stub ends for easy alignment.
• Spectacle & RTJ Flanges — Positive isolation and high-pressure sealing.

Why engineers choose it

• High Strength — Roughly double the yield strength of standard 300-series grades.
• Corrosion Resistance — Strong resistance to pitting, crevice and general corrosion.
• SCC Resistance — Far better resistance to chloride stress corrosion cracking.
• Cost Efficient — Thinner walls and long life trim material and lifecycle costs.

Where it is used

• Oil & Gas
• Chemical Processing
• Petrochemical
• Desalination
• Marine Applications
• Pulp & Paper
• Heat Exchangers
• Pressure Vessels
• Water Treatment
• Offshore Platforms
• Fabrication
• General Engineering

Inspection & paperwork

Suppliers on MetalMitra back Duplex Steel Flanges with the checks and paperwork your QA team expects.

• Dimensional inspection
• Visual and surface inspection
• Grade verification against the order
• Chemical composition verification
• Mechanical testing as applicable
• Flange face and bolt-hole inspection
• Non-destructive testing as applicable
• EN 10204 3.1 Mill Test Certificate
• Third-party inspection (TPI) on request

Chemical & mechanical properties

Chemical composition and mechanical properties are supplied to the limits of the governing material standard. Actual heat values are reported on the mill test certificate shared with each consignment.

The MetalMitra advantage

• Checked sellers only — Every supplier profile is screened by MetalMitra before it goes live.
• Faster sourcing — Post one requirement and receive competitive offers without chasing calls.
• Paperwork sorted — MTC 3.1, test reports and TPI arranged as your project demands.
• Global logistics — Seaworthy packing and dispatch to project sites across the world.

Get a quote

Tell us the specification, quantity and destination you need for Duplex Steel Flanges. MetalMitra connects you with suppliers who can deliver.

Technical note: Figures shown are indicative. Final acceptance should be based on the applicable standard, approved drawings and the MTC supplied with the material.