Super Duplex 2507 Lined Stainless Steel Pipes

Exceptional Pitting and Crevice Corrosion Resistance: PRE ≥ 42 (typically 42–45) due to high chromium (24–26%), high molybdenum (3.0–5.0%), and nitrogen (0.24–0.32%) content – the highest among duplex stainless steels for lined pipe applications.

Ultra-High Mechanical Strength: Minimum yield strength of lining ≥ 550 MPa (approximately 3.2 times that of 316L and 1.2 times that of Duplex 2205).

Superior Chloride SCC Resistance: Excellent resistance to chloride-induced stress corrosion cracking, significantly outperforming both austenitic grades and standard duplex 2205.

NACE MR0175 / ISO 15156 Compliant: Fully qualified for extreme sour service with highest allowable H₂S partial pressures and lowest pH values.

Excellent Low-Temperature Toughness: Lining maintains excellent impact toughness down to -50°C with Charpy V-Notch ≥ 70J typical at -46°C.

Cost-Effective Alternative to Solid Super Duplex: Reduces material cost by 60-80% compared to solid Super Duplex 2507 pipe while providing equivalent internal corrosion protection.

High Resistance to Erosion and Corrosion Fatigue: Super Duplex lining provides outstanding resistance to high-velocity seawater and abrasive slurry applications.

Good Weldability: Requires strict procedure with low heat input, N₂ shielding gas, and ER2594 filler metal for overlay.

Weldable End Preparation: Available with weld overlay transition (butter layer) using ER2594 filler metal at pipe ends for field welding.

Full Range of Sizes: Available from 2″ to 48″ (DN50 to DN1200) with lining thickness from 2mm to 8mm.

International Certifications: Lined pipes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630, NACE MR0175, API 5LC, and ISO 13628-4 standards.

Super Duplex 2507 (S32750) contains higher chromium, molybdenum, and nitrogen compared to Duplex 2205, resulting in a PRE value of ≥42 (compared to ≤35 for 2205). PREN = %Cr + 3.3 × %Mo + 16 × %N ≥ 42 (typically 42–45).

Comparison of PRE (Pitting Resistance Equivalent) Values:

Base Pipe Selection: High-quality carbon steel, high-yield steel, or low-temperature steel base pipe selected based on service pressure, temperature, and depth requirements.

Base Pipe Preparation: Base pipe is cleaned (shot blasting to SA 2.5), inspected for surface defects, and prepared for lining application.

Lining Tube Fabrication: Super Duplex 2507 stainless steel sheet is rolled and welded into a tube slightly smaller than the base pipe ID using ER2594 filler metal.

Lining Insertion: The Super Duplex 2507 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 (35-65%).

Ferrite Content Verification: Lining material verified to have 35–65% ferrite content (minimum 40% for sour service) – documented.

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

Weld Overlay (Butter Layer): Pipe ends are prepared with Super Duplex 2507 weld overlay using ER2594 filler metal with N₂ shielding gas.

Hydrostatic Testing: Each lined pipe is hydrostatically tested to 1.5× design pressure to verify bond integrity.

NDT Inspection: Ultrasonic testing (UT), eddy current testing (ECT), and ferrite measurement verify lining thickness, bond quality, and phase balance – 100% coverage.

Charpy Impact Testing: For low-temperature service at -46°C (upon request).

End Finishing: Pipe ends are beveled per ASME B16.25 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, concrete weight coating) applied upon request.

Base Pipe Inspection: Chemical analysis, mechanical testing, dimensional check, hardness test, NDE per API 5L/A106/A333.

Lining Material Verification: PMI 100% for Super Duplex 2507 lining material – verification of Cr (24-26%), Ni (6-8%), Mo (3-5%), N (0.24-0.32%).

Ferrite Content Measurement: 35–65% ferrite required (minimum 40% for sour service) – documented per heat.

Microstructure Examination: Verification of balanced dual-phase structure, absence of intermetallic phases (sigma, chi) – per NORSOK M-630.

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 (minimum 4 points per meter).

Hydrostatic Test: Each pipe tested at 1.5× design pressure (minimum 1.5× MAWP) – documented.

Hardness Testing: ≤32 HRC for lining (NACE compliance).

Charpy Impact Testing: -46°C (-50°F) for offshore projects (upon request) – ≥70J typical.

Pitting Corrosion Test: ASTM G48 Method A – no pitting at 40°C (or 50°C for NORSOK) – 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.

Deepwater Subsea Oil & Gas: Subsea flowlines, riser systems, pipeline end termination (PLET) jumpers, subsea manifold headers, deepwater export lines (ISO 13628-4 compliant, ABS/BV/DNV certified to 3000m water depth).

HP/HT Sour Gas Pipelines: High-pressure, high-temperature sour gas gathering lines, wellhead flowlines, HP gas export pipelines (NACE MR0175 compliant, highest H₂S limits).

Offshore Platforms (Critical Service): Topsides HP/HT process piping, riser caissons, produced water lines, HP chemical injection lines (NORSOK M-630 certified).

Seawater Systems (High Velocity): High-pressure seawater injection lines, deepwater seawater lift risers, firewater system headers.

Desalination Plants (High Temperature): High-pressure brine lines, reverse osmosis feed headers, energy recovery device connections.

Flue Gas Desulfurization (FGD): Absorber recirculation lines, slurry headers, quench water lines – for high-chloride, low-pH zones.

Hydrometallurgy: Pressure acid leaching (PAL) feed lines, high-temperature solvent extraction transfer lines.

Geothermal Energy: High-temperature, high-chloride, high-H₂S brine flowlines, steam condensate return lines.

Military/Naval (Critical Systems): Naval vessel seawater systems, submarine ballast discharge lines, degaussing system piping (classification society certified).

1. Why choose Super Duplex 2507 lined pipe instead of solid Super Duplex 2507?
Super Duplex 2507 lined pipe provides the same internal corrosion resistance as solid Super Duplex at 15-25% of the material cost for large diameters. The carbon steel or high-yield steel base pipe provides structural strength at much lower cost, making it an economical choice for deepwater subsea flowlines, HP/HT sour gas pipelines, and long-distance offshore applications. Cost savings of 75-90% can be achieved, especially for large-diameter pipelines.

2. What is the maximum water depth for Super Duplex 2507 lined pipes?
With appropriate base pipe (API 5L X65/X70 with high collapse resistance) and external coating, Super Duplex 2507 lined pipes are suitable for water depths up to 3000 meters (10,000 feet) for subsea applications. DNV-OS-F101 compliance documentation available.

3. Can Super Duplex 2507 lined pipes be used for HP/HT sour service?

Yes. Super Duplex 2507 is fully NACE MR0175 / ISO 15156 compliant for sour service with the highest allowable H₂S partial pressures for duplex stainless steels. The combination of S32750 lining with appropriate high-yield base pipe (API 5L X65) provides excellent HP/HT sour gas performance.

4. What is the maximum service temperature for Super Duplex 2507 lined pipes?
250°C (482°F) for continuous service in chloride environments; 300°C (572°F) for non-chloride service in the base pipe. The lining maintains its corrosion resistance up to 250°C.

5. Can Super Duplex 2507 lined pipes be welded in the field?
Yes, with proper weld overlay (buttering) at pipe ends using ER2594 filler metal and N₂ shielding gas (Ar + 3-5% N₂). The multilayer weld overlay provides a transition layer allowing welding between carbon steel base pipes while maintaining corrosion resistance and ferrite phase balance (35-65% ferrite) at the weld joint. Qualified welding procedures (WPS/PQR) are available.

6. What base pipe material is recommended for deepwater subsea applications?
API 5L X65 or X70 with enhanced collapse resistance (as per DNV-OS-F101) is recommended for deepwater subsea applications. Grade X65 provides good strength and weldability; Grade X70 offers higher strength for deeper water applications.

7. What base pipe material is recommended for low-temperature service (-46°C)?
ASTM A333 Grade 6 is recommended for low-temperature service down to -46°C (-50°F). Charpy impact testing at -46°C can be provided for both base pipe and lining upon request.

8. What is the minimum lining thickness for deepwater HP/HT sour gas service?
Minimum 4mm Super Duplex 2507 lining for deepwater HP/HT sour gas service. For severe sour service (high H₂S, low pH), 5-6mm lining thickness is recommended to provide additional corrosion allowance.

Highest Corrosion Resistance: PRE ≥42 – highest among duplex stainless steels for lined pipe applications

Deepwater Subsea Certified: ABS, BV, DNV, LR certified for water depths up to 3000m

NACE MR0175 / ISO 15156 Compliant: Highest H₂S partial pressure tolerance for sour service

NORSOK M-630 Qualified: Complete offshore and subsea documentation packages

DNV-OS-F101 Compliant: Suitable for submarine pipeline systems

ISO 13628-4 Compliant: Suitable for subsea production systems

Ferrite Controlled: 35-65% ferrite documented (minimum 40% for sour service)

Charpy Impact Tested: -46°C (-50°F) documented for offshore projects

ASTM G48 Corrosion Tested: Pitting resistance verified

API 5LC Compliant: CRA line pipe for oil and gas

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

Complete Size Range: 2″ to 48″ (DN50 to DN1200) – standard and custom sizes

Multiple Base Pipe Grades: API 5L X52-X70, A694 F52-F65, A333 Gr 6, A106 Gr B

Lining Thickness Options: 2mm to 8mm – tailored to your service severity

Weld Overlay Ready: Pipe ends prepared with ER2594 butter layer for field welding

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

Global Delivery: Exported to major deepwater subsea, HP/HT sour gas, and extreme offshore projects worldwide (Gulf of Mexico, North Sea, Brazil Santos Basin, West Africa, SE Asia)

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 products, precision machined components, and custom solutions for corrosion resistant applications.

Stock Examples (Super Duplex 2507 Lined Pipes – API 5L X65 Base – 4mm Lining – Weld Overlay Ends – NACE MR0175 – Deepwater Subsea):

Stock Examples (Super Duplex 2507 Lined Pipes – A694 F65 Base – High Pressure – 5mm Lining – HP/HT Sour Service):

Stock Examples (Super Duplex 2507 Lined Pipes – A333 Gr 6 Base – Low Temperature – Arctic Service – 4mm Lining):

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