Duplex Steel S31803 Pipes - Manufacturer, Supplier

Duplex Steel UNS S31803 Pipes Supplier in Mumbai, India

Piyush Steel offers high-quality Duplex Steel UNS S31803 pipes, renowned for their dual-phase (austenitic–ferritic) structure that delivers exceptional strength and corrosion resistance. UNS S31803, equivalent to ASTM A790 or ASME SA790, provides nearly double the yield strength of common 316 stainless steel, making it well-suited for demanding environments like oil and gas, marine, and chemical processing.

Our S31803 duplex stainless steel pipes are available in both seamless and welded forms, with typical sizes from ½″ to 24″ NB and various wall schedules (SCH 10 through XXS). The chemical makeup consists of about 22–23% chromium, 3–3.5% molybdenum, 4.5–6.5% nickel, and 0.14–0.20% nitrogen, which is perfect for preventing damage from chloride pitting, crevice corrosion, and stress corrosion cracking in tough conditions. With tensile strengths up to 800 MPa and yields of ≥ 550 MPa, these pipes offer both mechanical robustness and corrosion resilience.

These duplex stainless steel pipes excel in applications ranging from offshore platforms and process piping to desalination systems and architectural structures. Their mix of ferritic and austenitic properties makes them easy to weld with TIG or MIG methods, but it's important to control the heat carefully and have skilled workers to keep the best microstructure and resistance to corrosion. For installations in chloride-heavy or high-pressure environments, UNS S31803 is often preferred over standard alloys due to its enhanced performance and cost efficiency.

Piyush Steel stocks ASTM A790 S31803 seamless and welded duplex steel pipes with options for plain or beveled ends, custom lengths, and diameters from 6 mm to 630 mm OD. Each batch comes with complete documentation—including Mill Test Certificates and third-party inspection facilities—ensuring full traceability and compliance with international standards. Whether your project is offshore drilling, heat recovery, or wastewater treatment, choosing duplex stainless steel UNS S31803 pipe minimizes corrosion maintenance while maximizing lifespan and performance.

Our experience supplying Duplex Steel S31803 pipe across India and abroad empowers us to recommend the best-fit materials for your process conditions. With in-stock availability across schedules and dimensions, we simplify project planning and reduce lead times. Piyush Steel helps you with your engineering needs by providing technical information, advice on choosing materials, and quick delivery—offering UNS S31803 pipes that fulfill both practical requirements and legal standards.

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ASME SA790 S31803 Duplex Steel Pipes Equivalent Grades

Duplex Steel S31803 Pipe Forms in Stock

Stock Size Range and Specifications For Duplex Steel S31803 Pipe

Pipe Specification : ASTM A790, A358 / ASME SA790, SA358

Dimension Standard : ANSI B36.19M, ANSI B36.10

Outside Diameter : 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock

Thickness Range : 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS

Type : Seamless / ERW / Welded / Fabricated Pipes

Form : Round, Square, Rectangular, Oval, Hydraulic Etc

Length : Single Random, Double Random & Required Length

End : Plain End, Beveled End, Treaded

End Protection : Plastic Caps

Outside Finish : 2B, No.4, No.1, No.8 Mirror Finish for Duplex Steel Pipes, Finish as per customer Requirements

Delivery Condition : Annealed and Pickled, Polished, Bright Annealed, Cold Drawn

Inspection, Test Reports : Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports

Packing : Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests

Specials : Sizes and Specifications other than above can be manufactured on request

Chemical Composition of Duplex Steel S31803 Pipes

Mechanical Properties of Duplex S31803 / 1.4462 Pipes

Markings On The Duplex Steel S31803 Pipes

The full identification of the pipe should be continuously marked down its whole length, including :

•   Nominal Pipe Size (Nominal Bore)
•   Schedule (Wall Thickness)
•   Specification
•   Grade
•   Method of Manufacture (Seamless or Welded)
•   Heat Number
•   Manufacturer’s Name or Symbol

Duplex Steel S31803 Pipes Application Industries

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