2205 Duplex Stainless Steel Pipe

Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC) in seawater, brackish water, and aggressive chemical media. PRE (Pitting Resistance Equivalent) ≥ 34 for S31803 and ≥ 35 for S32205.

High Mechanical Strength: Minimum yield strength of ≥ 450 MPa (approximately twice that of 316L), allowing for thinner wall sections, weight reduction, and lower overall project costs.

Weldability and Fabricability: Maintains balanced ferrite/austenite ratio in the weld zone with proper welding procedures and heat input control. Good weldability without the need for post-weld heat treatment for many applications.

Surface Quality: Smooth internal surface and polished exterior available for sanitary and industrial applications.

Thermal Performance: Lower thermal expansion coefficient and higher thermal conductivity than austenitic grades, providing better thermal fatigue resistance.

International Certification: Pipes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630 and ISO 17781 standards for offshore and oil & gas projects.

The 2205 Duplex Stainless Steel Pipe produced by Womic Steel conforms to multiple international specifications used in industrial, pressure, and offshore applications:

These standards ensure that 2205 Duplex Stainless Steel Pipe meet global requirements for chemical composition, balanced dual-phase microstructure, mechanical performance, testing, and dimensional accuracy.

Different specifications can be customized according to special requirements.

Note: S32205 is a restricted composition range of S31803, offering tighter control of Cr, Mo, and N to enhance corrosion resistance and ensure optimal phase balance. The addition of nitrogen (N) promotes austenite stability and significantly increases pitting resistance.

Both S31803 and S32205 Seamless & Welded Duplex Stainless Steel Pipes exhibit excellent corrosion resistance and high mechanical strength. The balanced duplex microstructure provides superior resistance to chloride stress corrosion cracking (SCC) compared to austenitic grades like 304 and 316L, especially in high-temperature chloride service environments.

The 2205 Duplex Stainless Steel Pipe offers high strength and good ductility, making it suitable for high-pressure and corrosive service applications.

Impact Toughness (Charpy V-Notch, typical at -40°C): ≥ 60 J (longitudinal)

2205 Duplex Seamless & Welded Stainless Steel Pipe – Heat Treatment Condition:

Both S31803 and S32205 duplex pipes are solution annealed at 1040–1120°C followed by rapid cooling (water quenching) . This heat treatment:

1. Restores the balanced 50/50 ferrite-austenite microstructure.

2. Dissolves unwanted intermetallic phases (sigma, chi) that can reduce corrosion resistance and toughness.

3. Relieves internal stresses from forming or welding.

4. Ensures optimal mechanical properties and corrosion performance.

5. Critical Note: Unlike austenitic grades (316/316L), duplex stainless steel requires rapid cooling after solution annealing to prevent the precipitation of brittle intermetallic phases.

6. 2205 Duplex Seamless & Welded Stainless Steel Pipe – Delivery Condition:

7. Pipes are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance. Upon request, bright annealed or polished finishes can be provided for specific industrial or aesthetic requirements.

Womic Steel adopts advanced production technology to ensure each 2205 Duplex Seamless Stainless Steel Pipe meets exact specifications with balanced microstructure and flawless surface quality.

· Raw Material Selection: High-quality S31803/S32205 duplex billets from certified mills (Baosteel, TISCO, Outokumpu, POSCO) with certified chemical composition and ferrite/austenite balance.

· Heating and Piercing: Billets heated to controlled temperature (lower than austenitic grades to prevent ferrite coarsening) and pierced using a rotary piercing mill to form hollow shells.

· Hot Rolling: Shells elongated and rolled to desired intermediate size with strict temperature control.

· Cold Drawing / Cold Pilgering: Pipes refined to precise dimensions with improved surface finish and enhanced mechanical properties.

· Solution Annealing: Heat treatment at 1040–1120°C followed by water quenching to restore balanced duplex structure and corrosion resistance.

· Pickling & Passivation: Removal of oxides and creation of passive film using specialized pickling acids optimized for duplex grades.

· Straightening and Dimensional Calibration: Ensures consistent roundness and wall uniformity.

· Final Inspection & Marking: Each pipe tested (including ferrite content measurement), marked with grade, heat number, and standard before packing.

· This process guarantees a balanced dual-phase microstructure, smooth internal bore, high structural integrity, and exceptional corrosion resistance across all batches of Womic Steel's 2205 Duplex Seamless Steel Pipe.

Womic Steel utilizes state-of-the-art manufacturing technology to ensure every 2205 Duplex Welded Stainless Steel Pipe meets precise specifications with weld zone phase balance and excellent surface quality.

1.   Raw Material Selection: High-quality S31803/S32205 duplex stainless steel strips/coils from certified suppliers (e.g., Baosteel, TISCO, Outokumpu, POSCO).

2.   Slitting & Uncoiling: The steel coil is slit to the required width and uncoiled for feeding into the forming mill.

3.   Forming & Welding: The strip is progressively formed into a cylindrical shape and the edges are welded together using advanced TIG or Plasma welding techniques with appropriate heat input control and shielding gas (Ar + N₂) to maintain weld zone phase balance.

4.   Weld Seam Treatment: The external weld bead is removed to achieve a smooth surface, and the internal bead may be controlled or treated for bore cleanliness.

5.   Solution Annealing: A full heat treatment process at 1040–1120°C followed by water quenching is applied to dissolve carbides, restore corrosion resistance, and relieve stresses from welding and forming – essential for restoring balanced microstructure in the weld and HAZ.

6.   Sizing & Calibration: The pipe is passed through a sizing mill to achieve the final precise outer diameter and roundness.

7.   Straightening: The pipe is straightened to ensure optimal linearity.

8.   Pickling & Passivation: Chemical treatment removes scale and impurities, while promoting the formation of a protective passive oxide layer on the surface, including the weld zone.

9.   Ferrite Content Measurement: Verification of weld and base metal phase balance (typically 35–65% ferrite).

10.Non-Destructive Testing (NDT): The weld seam is inspected using methods like Eddy Current or Ultrasonic Testing to ensure integrity and quality.

11.Final Inspection & Marking: Each pipe undergoes dimensional checks, visual inspection, and is marked with grade, heat number, and relevant standards before packaging.

This controlled process guarantees a consistent weld seam, excellent dimensional accuracy, balanced duplex microstructure, and superior corrosion resistance for every batch of Womic Steel's 2205 Duplex Welded Steel Pipe.

1.   Outside Diameter: 6mm – 1219mm (1/4" – 48")

2.   Wall Thickness: 0.5mm – 50mm (SCH 5S – SCH XXS)

3.   Length: Up to 12m (fixed or random)

4.   Tolerances: According to ASTM A999 / EN ISO 1127

5.   ANSI B 36.19/ANSI B36.10 DIMENSIONS OF SEAMLESS & WELDED DUPLEX STAINLESS STEEL PIPE

Womic Steel offers a wide range of surface finishes to meet various industrial, marine, and offshore applications.

Each 2205 Duplex Stainless Steel Pipe surface is inspected for uniform appearance, absence of pits, and consistent finish quality.

Every 2205 Duplex Stainless Steel Pipe undergoes comprehensive inspection in accordance with ASTM, EN, NORSOK, and GB standards, including duplex-specific tests, to guarantee reliability and performance:

1.    Visual & Dimensional Inspection: Surface, roundness, wall thickness, straightness, and end preparation checked.

2.    Hydrostatic Pressure Test: 100% tested for leakage and pressure resistance.

3.    Eddy Current Test (ECT): Detects surface and sub-surface imperfections.

4.    Ultrasonic Test (UT): Ensures internal integrity of the seamless structure and weld seam.

5.    Positive Material Identification (PMI): Confirms correct chemical grade of the 2205 Duplex Stainless Steel Pipe (Cr, Ni, Mo, N verification).

6.    Ferrite Content Measurement: Critical test using magnetic induction or metallographic methods – requirement: 35–65% ferrite.

7.    Microstructure Examination: Verification of balanced dual-phase structure, absence of intermetallic phases (sigma, chi).

8.    Intergranular Corrosion Test (IGC): Validates resistance to sensitization (per ASTM A262).

9.    Flattening & Flaring Tests: Evaluate ductility and deformation capability.

10. Hardness & Tensile Testing: Confirms mechanical compliance with ASTM standards (yield strength ≥450 MPa is key).

11. Charpy Impact Testing (optional, often required for offshore): Verifies low-temperature toughness at -40°C or -46°C.

12. Pitting Corrosion Test (optional): Per ASTM G48 Method A or C for critical seawater service.

13. Surface Roughness and Cleanliness Check: For sanitary or polished tubes.

14. Third-Party Inspection (SGS / BV / DNV / TUV): Available upon customer request.

These extensive tests ensure that every 2205 Duplex Stainless Steel Pipe from Womic Steel meets the highest international standards for reliability, corrosion resistance, and longevity.

2205 Duplex Stainless Steel Pipe is ideal for a wide variety of industries requiring high strength and corrosion resistance in demanding conditions:

1.2205 Duplex Stainless Steel Pipe for Offshore Oil & Gas: Process piping, topside modules, subsea pipelines, risers, umbilical tubes (ship classification certifications available from ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK).

2.2205 Duplex Stainless Steel Pipe for Marine Engineering: Seawater cooling systems, ballast piping, firewater lines, desalination plants (reverse osmosis), shipboard piping

3.2205 Duplex Stainless Steel Pipe for Chemical & Petrochemical Industry: Heat exchangers, pressure vessels, reactors, acid-resistant lines (acetic, formic, phosphoric acids).

4.2205 Duplex Stainless Steel Pipe for Oil Refining: Atmospheric/vacuum distillation units, catalytic crackers, sour gas (H₂S) service.

5.2205 Duplex Stainless Steel Pipe for Pulp & Paper Industry: Digester vessels, bleach plants (chlorine dioxide service), black liquor recovery lines.

6.2205 Duplex Stainless Steel Pipe for Desalination Plants: High-pressure brine piping, reverse osmosis feed lines, evaporation units.

7.2205 Duplex Stainless Steel Pipe for Flue Gas Desulfurization (FGD): Absorber towers, ductwork, slurry piping in coal-fired power plants.

8.2205 Duplex Stainless Steel Pipe for Construction & Structural: Bridge components, crane rails, offshore platform structures – high strength reduces weight.

Each 2205 Duplex Stainless Steel Pipe is securely packed and clearly labeled to ensure safe and efficient transport worldwide.

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

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

Packaging of 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 to be exported: Wooden or steel crate packaging for export sea-worthy transport.

General packaging for products to be exported: Wooden box for export sea-worthy transport.

Packaging of heat exchanger tubes and precision tubes: Wooden box for local truck and export sea-worthy transport.

1. Direct cooperation with global shipowners ensures the most competitive freight rates

2. Professional loading and securing teams guarantee damage-free shipment, especially for long-length duplex pipes.

3. Efficient document preparation – including EN 10204 3.1/3.2 certificates, NORSOK M-630 documentation, and material test reports (MTR) – minimizing customs delays.

4. Rapid delivery time — standard sizes of 2205 duplex kept in ready stock (over 5,000 tons) for immediate dispatch.

5. Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.

Womic Steel is a trusted manufacturer and exporter specializing in 2205 Duplex Stainless Steel Pipe, committed to delivering premium quality and professional service for demanding applications.

Strict quality control under ISO 9001 and PED 2014/68/EU certification.

Duplex-specific expertise – experienced technicians trained in phase balance control and duplex welding.

Modern production lines including cold pilger mills and automatic TIG welding lines with nitrogen shielding.

Complete testing, inspection, and documentation support – including ferrite measurement, PMI, and NORSOK compliance.

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

Fast production cycle and reliable global shipping to all major ports.

Direct mill pricing – no middlemen, ensuring cost-effective duplex solutions.

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.