What are the specifications of Super Duplex 2507 Seamless Pipe?

Available in UNS S32750 (ASTM A790), OD 1/2"-24" NB, Sch 10S-80S/XXS, hot finished or cold drawn seamless construction, with PREN typically exceeding 40.

Where is Super Duplex 2507 typically specified?

It is widely specified in offshore oil & gas, sour service, and seawater applications requiring both high strength and superior corrosion resistance, particularly subsea and high-pressure flowline service.

Why does super duplex require more careful welding control than standard duplex?

Its higher alloy content makes it more prone to detrimental intermetallic phase precipitation if heat input or interpass temperature limits are exceeded, so welding procedures are typically more tightly qualified and controlled.

Can 2507 wall thickness be reduced compared to standard duplex or austenitic pipe for the same pressure rating?

Yes, its significantly higher yield strength allows thinner wall sections for equivalent pressure ratings under ASME B31.3, which can offer weight and cost savings on large-diameter lines despite the higher per-unit alloy cost.

Does Sakshi Forge provide Material Test Certificates (MTC) for Super Duplex 2507 Seamless Pipe?

Yes, MTC as per EN 10204 3.1 is provided with every dispatch along with inspection reports and pitting resistance test data on request.

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Super Duplex 2507 Seamless Pipe - High Strength High Alloy Duplex Pipe | Sakshi Forge

Ultra-High Strength Super Duplex Pipe with 550 MPa Yield & PREN ≥ 42 for Subsea & Offshore Duty

Heavy alloy content (25% Cr, 7% Ni, 4% Mo, 0.28% N) delivering PREN ≥ 42 for supreme pitting resistance

Exceptional yield strength (≥550 MPa) enabling major wall thickness and weight reduction on offshore platforms

Certified NACE MR0175 / ISO 15156 compliant for severe sour gas (H2S) service

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

Super Duplex 2507 (UNS S32750 / EN 1.4410 / SAF 2507) is an ultra-high-strength, highly-alloyed dual-phase stainless steel seamless pipe engineered for the most aggressive offshore, subsea, and sour chemical processing environments. Its chemistry features 24.0%-26.0% Chromium, 6.0%-8.0% Nickel, 3.0%-5.0% Molybdenum, and 0.24%-0.32% Nitrogen, achieving a Pitting Resistance Equivalent Number (PREN) ≥ 42. This heavy alloying delivers exceptional mechanical properties: a minimum yield strength of 550 MPa (nearly triple 316L and double 2205) alongside supreme resistance to chloride pitting, crevice corrosion, and sulfide stress corrosion cracking (SCC). Sakshi Forge manufactures Super Duplex 2507 seamless pipes via hot extrusion and cold drawing, followed by stringent solution annealing at 1025-1125°C and rapid water quenching to prevent embrittling sigma and chi phases. It is the material of choice for subsea umbilicals, offshore firewater lines, sour gas flowlines, and seawater reverse osmosis systems.

Terminology & Abbreviations

UNS S32750|S32750

Werkstoff 1.4410|1.4410

Super Duplex 2507|2507

ASTM A790 S32750|S32750

Key Technical Facts

Microstructure consists of 40-60% ferrite and balance austenite with PREN (Cr + 3.3Mo + 16N) ≥ 42

Yield strength (0.2% offset ≥ 550 MPa) is nearly triple standard 316L and 20% higher than Duplex 2205

Outstanding resistance to crevice corrosion and pitting in high-temperature seawater up to 50°C

Immune to chloride stress corrosion cracking (SCC) in severe sour oilfield and marine environments

Certified for sour service per NACE MR0175 / ISO 15156 under high H2S partial pressures

Solution heat treated at 1025°C - 1125°C with rapid water quenching to prevent sigma/chi intermetallic phases

Manufactured via hot extruded seamless process per ASTM A790 Grade S32750

Supplied 100% hydrotested, PMI verified, and certified with optional ASTM G48 ferric chloride pitting tests

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.

Super Duplex 2507 seamless pipe is specified under UNS S32750 / ASTM A790. It features 25% Chromium, 7% Nickel, 4% Molybdenum, 0.28% Nitrogen, 550 MPa yield strength, and PREN ≥ 42.

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