Super Duplex 2507 Stainless Steel Pipe Fittings for Extreme Offshore and High-Chloride Service

Ultra-High Pitting Resistance (PRE ≥ 42): Outperforms 2205 and 316L in high-chloride, low-pH environments.

Very High Strength (YS ≥ 550 MPa): Allows significant wall thickness reduction.

Excellent SSC/SCC Resistance: Qualified for high H₂S partial pressure sour service.

Good Weldability: Must follow strict procedure (low heat input, water quenching after annealing).

Full Range: Butt-weld (ASME B16.9), socket-weld (B16.11), threaded (NPT).

International Certifications: ABS, BV, DNV, LR, NORSOK M-650, NACE MR0175, API 5LC.

The PREN (Pitting Resistance Equivalent) for S32750 is ≥42, providing outstanding resistance to localized corrosion in severe chloride environments.

Heat Treatment Condition:
All super duplex 2507 fittings are solution annealed at 1050–1120°C followed by immediate water quenching (delay less than 30 seconds). This treatment restores the balanced ferrite-austenite microstructure (40–60% ferrite), dissolves intermetallic phases, and ensures maximum corrosion resistance.

Note: De-rating factors for super duplex at elevated temperatures are more severe than austenitic. Consult project specifications.

Raw Material Selection: High-quality S32750 super duplex billets from certified mills (Outokumpu, Sandvik).

Cutting & Heating: Precise cutting and induction heating to narrow temperature range.

Forming: Hot forging or extrusion under strict temperature control.

Solution Annealing: Heat treated at 1050–1120°C followed by immediate water quenching (<30 sec delay).

Machining & Beveling: Precision machining for SW/threaded; beveling for BW.

Pickling & Passivation: Special pickling acids for super duplex to avoid hydrogen embrittlement.

Marking & Inspection: Laser/inkjet marked with grade, heat number, size, and standard.

Chemical Analysis: PMI 100% verification of Cr, Ni, Mo, N.

Ferrite Content Measurement: 35–65% ferrite required (automated ferritoscope).

Mechanical Testing: Tensile, yield, elongation, hardness, Charpy impact (-46°C for offshore).

Dimensional Inspection: Go/no-go gauges, CMM, angle/wall thickness tools.

NDT: 100% Penetrant Testing (PT); UT/RT upon request.

Corrosion Testing: ASTM G48 Method A pitting test (mandatory for NORSOK); intergranular corrosion test (ASTM G28).

Sour Service Qualification: NACE MR0175 HIC/SSC testing upon request.

Third-Party Inspection: SGS, BV, DNV, TUV, LR available.

Deepwater Subsea: Manifolds, jumper connections, umbilical termination fittings.

Sour Gas Processing: High-pressure H₂S/CO₂ pipelines, wellhead flowlines.

Flue Gas Desulfurization (FGD): Absorber spray headers, liquor transfer fittings.

Desalination: High-temperature brine heater connections.

Offshore Topside: HP/HT heat exchanger piping, produced water systems.

Small bore fittings (≤2″): Cartons or woven bags with moisture-proof film.

Large bore fittings (≥2.5″): Heavy-duty wooden crates with foam lining, individual wrapping with VCI paper.

End Protection: Plastic caps for butt-weld ends; thread protectors for threaded ends.

Labeling: Each fitting has a sticker (material, heat number, size) plus waterproof shipping marks.

Ready stock: 1/2″–12″Sch40S–dispatch within 24 hours.

Direct shipping cooperation with global shipowners for competitive freight.

Professional loading teams ensure damage-free shipment.

Full certification package: NACE, NORSOK, MTR, heat treatment charts.

1. What is the difference between 2507 and 2205 fittings?
2507 has higher Cr, Mo, N, giving PRE ≥42 vs 35, and higher strength (≥550 MPa vs 450 MPa). It is better suited for extreme seawater and sour service.

2. Can 2507 fittings be welded without PWHT?
Yes, but require strict procedure and matching filler (ER2594). The fittings are supplied solution annealed; after welding, no PWHT is required if proper procedures are followed.

3. Are 2507 fittings susceptible to hydrogen embrittlement?
Avoid cathodic overprotection; pickling must be carefully controlled. Womic ensures proper pickling processes.

Complete Product Range: Butt-weld, socket-weld, and threaded fittings – one-stop purchasing.

Strict Quality Control: ISO 9001, PED 2014/68/EU, NORSOK M-650 certified.

Premium Mill Sources: Outokumpu, Sandvik raw materials.

Full Traceability: From heat number to finished fitting – complete documentation.

NACE & NORSOK Compliance: Full qualification packages available.

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Super Duplex 2507 stainless steel pipe fittings. We offer certified quality, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.

Stock Examples:

90° LR Elbow: 3″ Sch80S, 6″ Sch40S

Equal Tee: 4″×4″ Sch10S, 6″×6″ Sch40S

Concentric Reducer: 6″×4″ Sch80S, 8″×6″ Sch40S       

Cap: 8″ Sch40S, 12″ Sch40S

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