Duplex 2205 Lined Stainless Steel Pipes

High Strength (≥450 MPa Yield): 

Duplex 2205 lining provides approximately twice the yield strength of 316L, allowing for thinner lining and enhanced structural integrity.

Superior Chloride SCC Resistance: 

Outstanding resistance to chloride-induced stress corrosion cracking, performing reliably in high-chloride environments where 304L and 316L fail.

Excellent Pitting and Crevice Corrosion Resistance: 

PRE (Pitting Resistance Equivalent) ≥ 34 for S31803 and ≥ 35 for S32205, providing reliable service in seawater and aggressive chemical media.

NACE MR0175 / ISO 15156 Compliant: 

Fully qualified for sour service (H₂S) applications up to 232°C (450°F), with documented HIC and SSC test reports available.

Cost-Effective Alternative to Solid Duplex: 

Reduces material cost by 50-70% compared to solid Duplex 2205 pipe while providing equivalent internal corrosion protection.

Balanced Dual-Phase Microstructure: 

Approximately 50% ferrite and 50% austenite provides excellent combination of mechanical properties and corrosion resistance.

Good Weldability: 

Maintains balanced ferrite/austenite ratio in the weld zone with proper welding procedures using ER2209 filler metal for overlay.

Weldable End Preparation: 

Available with weld overlay transition (butter layer) using ER2209 filler metal at pipe ends for field welding.

High Resistance to Erosion and Wear: 

Duplex lining provides improved resistance to erosion and wear compared to austenitic grades.

Full Range of Sizes: 

Available from 2″ to 60″ (DN50 to DN1500) with lining thickness from 2mm to 6mm.

International Certifications: 

Lined pipes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630 and NACE MR0175 standards.

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 PRE (Pitting Resistance Equivalent) for S32205 is ≥35, compared to ≤26 for 316L.

Base Pipe Selection: 

High-quality carbon steel or low-temperature steel base pipe selected based on service pressure and temperature requirements.

Base Pipe Preparation: 

Base pipe is cleaned (shot blasting), inspected, and prepared for lining application.

Lining Tube Fabrication: 

Duplex 2205 stainless steel sheet is rolled and welded into a tube slightly smaller than the base pipe ID using ER2209 filler metal.

Lining Insertion: 

The Duplex 2205 lining tube is inserted into the base pipe.

Hydraulic Expansion: 

High-pressure water (up to 5000 psi) expands the lining tube against the base pipe inner wall, creating a tight mechanical bond with controlled ferrite content.

Ferrite Content Verification: 

Lining material verified to have 35-65% ferrite content for optimal corrosion resistance.

Weld Overlay (Butter Layer): 

Pipe ends are prepared with Duplex 2205 weld overlay using ER2209 filler metal to prevent galvanic corrosion at field welds.

Hydrostatic Testing: 

Each lined pipe is hydrostatically tested to verify bond integrity and pressure rating.

NDT Inspection: 

Ultrasonic testing (UT), eddy current testing (ECT), and ferrite measurement verify lining thickness, bond quality, and phase balance.

End Finishing: 

Pipe ends are beveled and prepared for field welding.

Marking & Coating: 

Pipes are marked with grade, size, lining thickness, heat number, ferrite content, and standard. External coating (FBE, 3LPE, 3LPP) applied upon request.

Base Pipe Inspection: 

Chemical analysis, mechanical testing, dimensional check, hardness test per API 5L/A106.

Lining Material Verification: 

PMI 100% for Duplex 2205 lining material – verification of Cr, Ni, Mo, N.

Ferrite Content Measurement: 

35-65% ferrite required – documented.

Microstructure Examination: 

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

Bond Integrity Testing: 

Ultrasonic test (UT) to verify bond between lining and base pipe – 100% coverage.

Lining Thickness Check: 

Ultrasonic thickness measurement at multiple points.

Hydrostatic Test: 

Each pipe tested at 1.5× design pressure.

Hardness Testing: 

≤32 HRC for NACE compliance (sour service).

Charpy Impact Testing: 

For low-temperature service (upon request).

Pitting Corrosion Test: 

ASTM G48 – upon request.

Sour Service Qualification (upon request): 

HIC per NACE TM0284, SSC per NACE TM0177.

Third-Party Inspection: 

SGS, BV, DNV, TUV, LR, ABS available.

Offshore Oil & Gas Platforms: 

Topsides process piping, seawater lift lines, firewater systems, chemical injection lines (ABS/BV/DNV/LR certified, NORSOK M-630 compliant).

Sour Gas Pipelines: 

Wet sour gas gathering lines, H₂S-containing pipelines, CO₂ injection lines (NACE MR0175 compliant).

Seawater Systems: 

Seawater cooling intake lines, brine discharge lines, ballast water systems, desalination plant feed lines.

Subsea Flowlines: 

Deepwater subsea pipelines (up to 3000m), riser lines, flowline jumpers (DNV-OS-F101 compliant).

Desalination Plants: 

High-pressure brine lines, reverse osmosis feed lines, evaporator inlet lines.

Chemical Processing (Chloride Service): 

Chloride-containing process lines, pulp & paper bleach plant piping, titanium dioxide production lines.

Flue Gas Desulfurization (FGD): 

Absorber recirculation lines, slurry lines, quench water lines.

Oil Refining (Sour Service): 

Sour water stripper lines, amine regenerator lines, hydrotreater feed lines.

1. Why choose Duplex 2205 lined pipe instead of solid Duplex 2205?
Duplex 2205 lined pipe provides the same internal corrosion resistance as solid Duplex at 30-40% of the material cost. The carbon steel base pipe provides structural strength at much lower cost, making it an economical choice for large-diameter pipelines and long-distance applications.

2. Can Duplex 2205 lined pipes be used for sour service (H₂S)?
Yes, with proper base pipe selection (API 5L X52/X65 with hardness control) and NACE MR0175 compliant lining. Full documentation including HIC and SSC test reports available upon request.

3. What is the maximum temperature for Duplex 2205 lined pipes?
250°C (482°F) for continuous service in chloride environments; 300°C (572°F) for non-chloride service in the base pipe. Above 300°C, risk of sigma phase embrittlement in the lining increases.

4. Can Duplex 2205 lined pipes be welded in the field?
Yes, with proper weld overlay (buttering) at pipe ends using ER2209 filler metal. The weld overlay provides a transition layer allowing welding between carbon steel base pipes while maintaining corrosion resistance and phase balance at the weld joint.

5. What base pipe material is recommended for low-temperature service?
ASTM A333 Grade 6 is recommended for low-temperature service down to -46°C (-50°F). Impact testing (Charpy V-Notch) can be provided upon request.

6. What is the minimum lining thickness for seawater service?
Minimum 3mm Duplex 2205 lining for continuous seawater service. For high-velocity or turbulent seawater (up to 10 m/s), 4-5mm lining thickness is recommended.

7. Are Duplex 2205 lined pipes suitable for subsea pipelines?
Yes, with appropriate base pipe (API 5L X65 or higher) and external coating (3LPE/3LPP). DNV-OS-F101 compliance documentation available.

Cost-Effective Alternative: 60-80% cost savings compared to solid Duplex 2205 pipe

NACE MR0175 Compliant: Full sour service documentation for oil and gas applications

NORSOK M-630 Qualified: Complete offshore documentation available

Ferrite Controlled: 35-65% ferrite documented for lining material

Complete Size Range: 2″ to 60″ (DN50 to DN1500) – all standard sizes available

Multiple Base Pipe Grades: API 5L X42-X70, A106 Gr B, A333 Gr 6

Lining Thickness Options: 2mm to 6mm – tailored to your service severity

Weld Overlay Ready: Pipe ends prepared with ER2209 stainless steel butter layer for field welding

Full Traceability: Heat number on each pipe – traceable to original mill certificate

Marine & Offshore Certified: ABS, BV, DNV, LR certifications available

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

Global Delivery: Exported to major offshore, subsea, and sour gas projects worldwide

Website: www.womicstainless.com

E-mail: info@womicstainless.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Stock Examples (Duplex 2205 Lined Pipes – API 5L X52 Base – 3mm Lining – Weld Overlay Ends – NACE MR0175):

Stock Examples (Duplex 2205 Lined Pipes – A333 Gr 6 Base – Low Temperature – 4mm Lining):

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