What are the specifications of Duplex 2205 Seamless Pipe?

Available in UNS S32205/S31803 (ASTM A790), OD 1/2"-24" NB, Sch 10S-80S, hot finished or cold drawn seamless construction, with phase balance verified via ferrite content testing.

Why is Duplex 2205 the most widely specified duplex grade?

It offers the best overall balance of strength, corrosion resistance, and cost among duplex grades, making it suitable for the widest range of oil & gas and chemical process applications.

What welding precautions are specific to duplex 2205?

Heat input and interpass temperature must be carefully controlled to maintain the correct austenite-ferrite balance in the weld and heat-affected zone; nitrogen-enriched shielding gas and matched filler metal are typically specified.

Can duplex 2205 be used at both high and cryogenic temperatures?

Its practical service range is generally -50°C to +300°C; below -50°C the ferrite phase can become brittle, and above 300°C long-term embrittlement risk increases, so austenitic grades are typically chosen outside this window.

Does Sakshi Forge provide Material Test Certificates (MTC) for Duplex 2205 Seamless Pipe?

Yes, MTC as per EN 10204 3.1 is provided with every dispatch along with inspection reports and ferrite content verification.

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Seamless Pipes

Duplex 2205 Seamless Pipe - Industry Standard Duplex Stainless Steel Pipe | Sakshi Forge

Workhorse Dual-Phase Stainless Steel Pipe with 450 MPa Yield Strength & PREN > 35

Balanced ~50/50 Austenite-Ferrite microstructure delivering double the yield strength of 316L

High PREN (>35) provides outstanding resistance to chloride pitting, crevice corrosion, and SCC

Certified ferrite content (35-65%) verified via Ferritescope per ASTM E562

EN 10204 3.1 MTC100% PMI TestedISO 9001:2015 CertifiedHydrostatic Tested

Hygienic Steel Grade

Request Price Quote

MTC EN 10204 3.1 Included

Global Sea & Air Freight

Electro-Chemical Finish Certificate

Response turnaround: Under 2 hours

Product Profile

Duplex 2205 (UNS S32205 / S31803 / EN 1.4462) is the workhorse dual-phase stainless steel seamless pipe, engineered with a balanced ~50% ferrite and ~50% austenite microstructure. Its chemistry comprises 22.0%-23.0% Chromium, 4.5%-6.5% Nickel, 3.0%-3.5% Molybdenum, and 0.14%-0.20% Nitrogen, yielding a Pitting Resistance Equivalent Number (PREN) > 35. This dual-phase structure delivers approximately double the yield strength (≥450 MPa) of standard 316L (220 MPa) in the solution-annealed condition, allowing engineers to significantly reduce wall thickness and pipe weight for equivalent pressure ratings under ASME B31.3. Furthermore, the ferrite phase imparts virtual immunity to chloride stress corrosion cracking (SCC). Sakshi Forge manufactures Duplex 2205 seamless pipes via hot extrusion and cold drawing, followed by rapid water quenching from 1020-1100°C to lock in phase balance and prevent embrittling sigma phase precipitation.

Terminology & Abbreviations

UNS S32205 / S31803|S32205

Werkstoff 1.4462|1.4462

Duplex 2205|2205

ASTM A790 S32205|S32205

Key Technical Facts

Microstructure consists of roughly equal proportions of austenite and ferrite phases (40-60% ferrite range)

Yield strength (0.2% offset ≥ 450 MPa) is double that of standard austenitic grades 304L/316L

High PREN (Cr + 3.3Mo + 16N ≥ 35) delivers superior pitting resistance in seawater and brackish media

Virtually immune to chloride stress corrosion cracking (SCC) up to 150°C in sour oilfield environments

Nitrogen alloying increases pitting resistance and stabilizes austenite phase after welding

Solution annealed at 1020°C - 1100°C followed by rapid water quench to prevent intermetallic (sigma) phase

Manufactured via seamless hot piercing/extrusion and cold drawing per ASTM A790 / ASME SA790

Supplied 100% hydrotested, PMI verified, and certified to NACE MR0175 / ISO 15156 for sour service

Why Choose Sakshi Forge

Our commitment to sterile, high-purity processing makes us a trusted manufacturing partner globally.

100% Heat Lot Traceability

Every pipe stamped with heat number matching EN 10204 3.1 MTC

Positive Material Identification (PMI)

Handheld XRF testing on every length prior to dispatch

Advanced NDT Inspection

Hydrostatic test and Eddy Current / Ultrasonic flaw detection on all orders

Precision Cold Drawing

Tighter wall thickness tolerances and superior internal bore smoothness

Custom Cut Lengths

Fixed lengths up to 12 meters or custom cut-to-length options to eliminate jobsite scrap

Ferrite & Phase Balance Testing

Ferritescope testing for duplex and super duplex grades to ensure 40-60% phase balance

High-Temperature Stabilization

Controlled heat treatment to fully precipitate carbides and optimize creep life

Pan-India & Export Freight

Fast dispatch across India and seaworthy export packing for global projects

Extensive Mill Stocking

Immediate inventory availability in standard schedules from Sch 10S to Sch 160

Third-Party Inspection Approved

Full support for TUV, SGS, DNV, Bureau Veritas, and Lloyds audits

Frequently Asked Questions

Common technical and pricing queries regarding specifications and ordering.

Duplex 2205 seamless pipe is specified under UNS S32205/S31803 / ASTM A790. It features 22% Chromium, 5% Nickel, 3% Molybdenum, 0.17% Nitrogen, and 450 MPa minimum yield strength.

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