S32760 Super Duplex Stainless Steel Pipe

Exceptional Pitting and Crevice Corrosion Resistance: 

PRE ≥ 40 (typically 40–43) due to high chromium (24–26%), molybdenum (3.0–4.0%), tungsten (0.5–1.0%), and nitrogen (0.20–0.30%) content, providing superior resistance in seawater, chlorides, and organic acids.

Superior Stress Corrosion Cracking Resistance: 

Excellent resistance to both chloride-induced SCC and sulfide-induced SSCC, significantly outperforming 316L, 2205, and even S32750 in sour (H₂S) service environments.

Enhanced Resistance in Reducing Acid Environments: 

The addition of copper (0.3–1.0%) improves corrosion resistance in sulfuric acid and other reducing acid media, giving S32760 an advantage over S32750 in certain chemical processing applications.

Ultra-High Mechanical Strength: 

Minimum yield strength of ≥ 550 MPa (approximately 2.5 times that of 316L), allowing for significant wall thickness reduction, weight savings, and cost optimization in critical applications.

Excellent Low-Temperature Toughness: 

Maintains good impact toughness down to -50°C, suitable for Arctic and deepwater subsea applications.

Outstanding Weldability: 

Maintains balanced ferrite/austenite ratio in the weld zone when using proper welding procedures, matching filler metals (e.g., 2594), and controlled heat input.

High Resistance to Erosion, Cavitation, and Corrosion Fatigue: 

Ideal for high-velocity seawater, slurry, and pump applications where combined mechanical and corrosive attack occurs.

International Certification: 

Pipes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630, ISO 17781, API 5LC, and NACE MR0175/ISO 15156 for sour service applications.

Womic Steel’s S32760 super duplex pipes conform to multiple international specifications for extreme corrosive, sour service, and high-pressure applications:

These standards ensure that S32760 super duplex pipes meet global requirements for chemical composition, balanced dual-phase microstructure, superior mechanical properties, sour service compatibility, rigorous testing, and dimensional accuracy.

Note: S32760 is distinguished from S32750 by the addition of tungsten (W) and copper (Cu). Tungsten enhances pitting resistance and provides solid solution strengthening. Copper improves resistance to reducing acids (e.g., sulfuric acid). The combination of W + Cu gives S32760 superior performance in sour service (H₂S) and certain chemical environments compared to S32750.

Pitting Resistance Equivalent (PRE) Calculation:
PRE = %Cr + 3.3 × (%Mo + 0.5 × %W) + 16 × %N ≥ 40 (typically 40–43)

Impact Toughness (Charpy V-Notch, typical at -46°C):

Longitudinal: ≥ 70 J (typical)

Transverse: ≥ 50 J (typical)

NACE MR0175 / ISO 15156 Compliance:
S32760 is fully qualified for sour service applications up to the limits specified in NACE MR0175/ISO 15156 for duplex stainless steels (maximum H₂S partial pressure and temperature limits apply).

l Heat Treatment Condition:
S32760 super duplex pipes are solution annealed at 1080–1150°C followed by rapid cooling (water quenching) . This heat treatment is critical and must be strictly controlled:

(1)   Dissolves unwanted intermetallic phases (sigma, chi, Laves phases) that form rapidly in tungsten-containing super duplex grades.

(2)   Restores the balanced 40–60% ferrite / 40–60% austenite microstructure.

(3)   Relieves internal stresses from forming, rolling, or welding.

(4)   Ensures optimal mechanical properties and maximum corrosion resistance.

Critical Note: S32760 has even higher susceptibility to intermetallic phase formation than S32750 due to the addition of tungsten. Water quenching is mandatory – air cooling is completely unacceptable. The solution annealing temperature range is also slightly higher (1080–1150°C vs 1050–1120°C for S32750) to fully dissolve tungsten-rich phases.

Delivery Condition: Pipes are normally supplied in solution annealed and pickled condition.

Womic Steel adopts advanced production technology and stringent process control to ensure each S32760 super duplex seamless pipe meets exact specifications with balanced microstructure and flawless surface quality.

1. Raw Material Selection: High-quality S32760 super duplex billets from certified mills (Outokumpu, Sandvik, POSCO) with certified chemical composition (including W and Cu verification) and ferrite/austenite balance. Raw material traceability is maintained from melt to final product.

2. Heating and Piercing: Billets heated to a carefully controlled temperature range (narrower window than S32750 due to tungsten content) and pierced using a rotary piercing mill.

3. Hot Rolling: Shells elongated and rolled to desired intermediate size with strict temperature control to prevent intermetallic precipitation.

4. Cold Drawing / Cold Pilgering: Pipes refined to precise dimensions with improved surface finish, enhanced mechanical properties, and work hardening control.

5. Solution Annealing (Intermediate and Final) : Multiple solution annealing steps at 1080–1150°C followed by water quenching to maintain phase balance throughout the manufacturing process.

6. Pickling & Passivation: Removal of oxides using specialized pickling acids optimized for tungsten-bearing super duplex grades; thorough rinsing to prevent hydrogen pickup.

7. Straightening and Dimensional Calibration: Ensures consistent roundness and wall uniformity without introducing excessive residual stress.

8. Final Inspection & Marking: Each pipe undergoes ferrite content measurement, 100% NDT, dimensional check, and is marked with grade, heat number, standard, and traceability code before packing.

This rigorous process guarantees a balanced dual-phase microstructure, smooth internal bore, high structural integrity, and exceptional corrosion resistance across all batches of Womic Steel’s S32760 Super Duplex Seamless Pipe.

Womic Steel utilizes state-of-the-art manufacturing technology with special procedures for tungsten-bearing super duplex to ensure every welded pipe meets precise specifications with weld zone phase balance and excellent corrosion resistance.

1. Raw Material Selection: High-quality S32760 super duplex stainless steel strips/coils from certified mills with full traceability and certified W + Cu content.

2. Slitting & Uncoiling: Precision slitting to required width; edge preparation to ensure clean, burr-free edges for welding.

3. Forming & Welding: The strip is progressively formed into a cylindrical shape. The edges are welded using advanced TIG or Plasma welding with:

Strict heat input control (typically 0.5–1.2 kJ/mm – slightly lower than S32750 to prevent tungsten segregation)

Shielding gas: Ar + N₂ (2–5% nitrogen) to prevent nitrogen loss and maintain phase balance

Matching filler metal: ER2594 (or specialized filler with W for optimal matching)

4. Weld Seam Treatment: External weld bead removal and optional internal bead control; weld zone may require light grinding to remove surface oxides.

5. Solution Annealing: Full heat treatment of the entire welded pipe at 1080–1150°C followed by water quenching – absolutely essential for restoring corrosion resistance and balanced microstructure in the weld and HAZ (heat-affected zone).

6. Sizing & Calibration: Final precise outer diameter and roundness.

7. Pickling & Passivation: Chemical treatment removes scale and promotes passive layer formation; extended pickling time required for tungsten-bearing super duplex grades.

8. Non-Destructive Testing (NDT) : Weld seam inspected using:

Eddy Current Testing (ECT)

Ultrasonic Testing (UT) – longitudinal and transverse

Optional: Radiographic Testing (RT) for critical applications

9. Ferrite Content Measurement: Verification of base metal, weld metal, and HAZ phase balance – typically 35–65% ferrite (weld zone may be 30–60%).

10.Corrosion Testing (mandatory for many specifications): Pitting resistance test per ASTM G48 Method A (ferric chloride) – no pitting at 40°C for 24 hours.

11.Final Inspection & Marking: Complete dimensional check, visual inspection, and traceable marking.

This controlled process guarantees a sound weld seam, excellent dimensional accuracy, balanced super duplex microstructure, and superior corrosion resistance for every batch of Womic Steel’s S32760 Welded Pipe.

Outside Diameter: 6mm – 914mm (1/4″ – 36″); larger diameters available upon request

Wall Thickness: 0.5mm – 40mm (SCH 10S – SCH XXS)

Length: Up to 12m (fixed or random); longer lengths up to 18m available for seamless

Tolerances: According to ASTM A999 / EN ISO 1127, with additional super duplex-specific requirements for straightness and ovality (tighter than standard duplex)

*(Refer to ANSI B36.19 / B36.10 dimension tables for detailed schedule matching)*

Womic Steel offers a range of surface finishes for S32760 super duplex pipes, each suited to specific industrial, offshore, and sour service applications.

Note: Bright annealing is not recommended for S32760 due to the water quenching requirement. Polished finishes are available upon request but are uncommon for super duplex in heavy industrial service.

Each S32760 pipe surface is inspected for uniform appearance, absence of pits, surface defects, and consistent finish quality.

Every S32760 super duplex stainless steel pipe undergoes comprehensive inspection in accordance with ASTM, EN, NORSOK, ISO, and NACE standards, including super duplex-specific and sour service critical tests, to guarantee reliability and performance:

These extensive tests ensure that every S32760 Super Duplex Stainless Steel Pipe from Womic Steel meets the highest international standards for reliability, corrosion resistance, sour service compatibility, and longevity in the most demanding environments.

S32760 super duplex stainless steel pipe is specified for the most demanding applications requiring both high strength and exceptional corrosion resistance, particularly in sour service and high-chloride environments. Womic Steel supplies to global projects with certifications available from all major classification societies.

Each S32760 super duplex stainless steel pipe is packed with extreme care due to the high value, long lead times, and critical nature of these products. Clear labeling includes grade, heat number, dimensions, project-specific markings, and NACE compliance certification references.

General packaging for local truck transport:
Bundle packing with woven fabric, iron strip bundle, plastic cap on both ends.

Hexagonal packaging:
Bundle packing with woven fabric, iron strip bundle, plastic cap on two ends.

Packaging for welded pipe in medium and large sizes:
Wrapped with woven fabric by automatic packaging for export sea-worthy transport.

Packaging for medium and large size welded pipes for export:
Wooden or steel crate packaging for export sea-worthy transport – mandatory for S32760 to prevent surface damage.

General packaging for products to be exported:
Wooden box for export sea-worthy transport – standard for S32760 seamless pipes.

Packaging for precision tubes and heat exchanger tubes:
Individual wrapping plus wooden box for both local truck and export sea-worthy transport.

Anti-rust protection:
VCI paper interleaving, edge protectors, and moisture barrier bags added for all S32760 shipments.

1. Direct cooperation with global shipowners ensures the most competitive freight rates for heavy and high-value super duplex shipments.

2. Professional loading and securing teams – S32760 pipes are handled with dedicated care using non-metallic slings and padded supports to prevent surface scratches and deformation.

3. Efficient document preparation – includes EN 10204 3.1/3.2 certificates, NORSOK M-630 documentation, NACE MR0175 compliance certificates, material test reports (MTR), and complete traceability records. Minimizes customs delays.

4. Rapid delivery time – select sizes of S32760 maintained in ready stock; custom sizes available with competitive lead times.

5. Continuous cargo tracking and after-sales follow-up – including pre-shipment inspection coordination, arrival notification, and technical support.

Womic Steel is a trusted manufacturer and exporter specializing in super duplex stainless steel pipes, including the tungsten-bearing S32760 grade. We are committed to delivering premium quality, technical expertise, and professional service for the world’s most demanding sour service and offshore projects.

Strict quality control under ISO 9001, PED 2014/68/EU, and NORSOK M-630 compliance.

S32760-specific expertise – specialized knowledge in tungsten-bearing super duplex phase balance control, heat treatment (water quenching at 1080–1150°C), and sour service qualifications.

Modern production lines – cold pilger mills, automatic TIG welding lines with nitrogen shielding, and in-line solution annealing furnaces with water quenching.

Complete in-house testing – including ferrite measurement, ASTM G48 pitting corrosion testing, Charpy impact testing at -46°C, and NACE sour service qualification support.

NACE MR0175 / ISO 15156 compliance – full documentation and testing for sour service applications.

Third-party inspection support – full coordination with SGS, BV, DNV, TUV, LR, and other approved agencies.

Full documentation – EN 10204 Type 3.1/3.2 certificates, material test reports (MTR), NORSOK compliance statements, NACE compliance certificates, and complete traceability from melt to final pipe.

Flexible customization – special diameters, wall thicknesses, lengths, beveled ends, and surface finishes.

Fast production cycle – efficient manufacturing for both seamless and welded S32760 pipes.

Reliable global shipping to all major energy hubs (Houston, Aberdeen, Dubai, Singapore, Perth, Rio de Janeiro, Luanda, etc.).

Direct mill pricing – no middlemen, ensuring competitive costs for premium super duplex products.

For inquiries, technical support, or to request a quotation for your specific clad pipe requirements, please contact us:

Website: www.womicstainless.com

E‑mail: info@womicstainless.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel – Your reliable partner for high‑quality stainless steel seamless pipes, metallurgically bonded clad tubes, and custom solutions for corrosion‑resistant applications.