Super Duplex 2507 Stainless Steel Channels

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.

Ultra-High Mechanical Strength: Minimum yield strength ≥ 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 sour service with highest allowable H₂S partial pressures and lowest pH values.

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

Low Thermal Expansion: Coefficient of thermal expansion (13.0 μm/m·K) – lowest among all duplex and austenitic grades.

High Resistance to Erosion and Corrosion Fatigue: 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.

International Certifications: Channels can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630, NACE MR0175, 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 Strength and Corrosion Resistance:

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

l  Longitudinal: ≥ 70 J (typical)

l  Transverse: ≥ 50 J (typical)

Heat Treatment Condition:
Super Duplex 2507 stainless steel channels are solution annealed at 1050–1120°C followed by immediate water quenching (delay must be kept under 30 seconds). This heat treatment restores the balanced 40–60% ferrite / 40–60% austenite microstructure, dissolves unwanted intermetallic phases, and ensures maximum corrosion resistance.

Critical Note: Super Duplex 2507 requires immediate water quenching after solution annealing. Air cooling is completely unacceptable and will result in intermetallic phase precipitation, severely reducing corrosion resistance and toughness.

Delivery Condition:
Channels are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance.

*Note: Weights calculated based on density 7.80 g/cm³. Custom sizes and longer lengths available upon request.*

Chemical Analysis: PMI verification for Cr (24-26%), Ni (6-8%), Mo (3-5%), N (0.24-0.32%).

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

Microstructure Examination: No sigma or chi phases – per NORSOK M-630.

Mechanical Testing: Tensile (≥800 MPa), yield (≥550 MPa), elongation (≥25%), hardness (≤310 HBW / ≤32 HRC).

Charpy Impact Testing: -46°C – ≥70J typical for longitudinal.

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

Dimensional Inspection: Web height, flange width, thickness, squareness, straightness, length.

Surface Inspection: Visual check for surface defects, cracks, and consistency.

Ultrasonic Testing (UT): 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 manifold supports, pipeline end termination (PLET) structural channels, jumper support channels, subsea distribution unit frameworks (ISO 13628-4 compliant, ABS/BV/DNV certified to 3000m).

HP/HT Sour Gas Facilities: Wellhead platform structures, sour gas processing skid frameworks, amine unit structural supports, gas dehydration unit platforms (NACE MR0175 compliant).

Offshore Platforms (Critical Service): Topsides HP/HT module skid channels, riser support structures, flare tower structural members, crane pedestal channels (NORSOK M-630 certified).

Desalination Plants (High Temperature): High-pressure brine system structural channels, energy recovery device frames, evaporator platform structures.

Flue Gas Desulfurization (FGD): Absorber tower support structures, slurry line pipe racks, quench nozzle platforms – for high-chloride, low-pH zones.

Chemical Processing (Aggressive Acids): HP/HT heat exchanger supports, reactor platform structures, acid storage tank support frames.

Hydrometallurgy: Pressure acid leaching (PAL) plant structural frameworks, high-temperature solvent extraction supports.

Geothermal Energy: High-temperature, high-chlorine, high-H₂S brine pipeline supports, steam condensate structural frames.

Standard Packaging:

Bundles with steel straps and woven fabric wrapping

Plastic end protection for cut edges

Wooden pallets or steel skids for export sea-worthy transport

Individual bundle labeling with grade, heat number, dimensions, ferrite content, NACE compliance

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading and securing teams using non-metallic slings prevent damage

Efficient document preparation (NORSOK M-630 documentation, NACE compliance certificates) minimizes customs delays

Continuous cargo tracking and after-sales follow-up

1. What is the difference between Super Duplex 2507 and Duplex 2205 channels?
Super Duplex 2507 has higher chromium (24-26% vs 22-23%), higher molybdenum (3-5% vs 3-3.5%), and higher nitrogen (0.24-0.32% vs 0.14-0.20%), giving PRE ≥42 (vs ≥35) and higher strength (YS ≥550 MPa vs ≥450 MPa). For deepwater subsea, HP/HT sour gas, and extreme chloride environments, 2507 is the preferred material.

2. What is the maximum water depth for Super Duplex 2507 channels?
With proper design, Super Duplex 2507 structural sections are suitable for water depths up to 3000 meters (10,000 feet) for subsea applications.

3. Can Super Duplex 2507 channels be welded?
Yes, but strict procedure required. Use ER2594 filler, low heat input (0.3-1.0 kJ/mm), N₂ shielding gas, interpass temperature <150°C. No PWHT required.

4. What is the maximum service temperature for Super Duplex 2507 channels?
250°C (482°F) for chloride service; 300°C (572°F) for non-chloride service. Above 300°C, risk of sigma phase embrittlement increases significantly.

5. Are Super Duplex 2507 channels suitable for sour service (H₂S environments)?
Yes. Super Duplex 2507 is fully NACE MR0175 / ISO 15156 compliant for sour service up to 232°C (450°F) with the highest allowable H₂S partial pressure limits. HIC and SSC test reports available upon request.

Highest Strength Available: 2.7-3.2x stronger than 316L – significant weight reduction for offshore structures

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

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

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

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

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

ASTM G48 Corrosion Tested: Pitting resistance verified

Full Traceability: Heat number on each bundle – traceable to raw mill certificate

Complete Size Range: From 100mm to 300mm web height – standard and custom sizes

Global Delivery: Exported to major deepwater subsea and HP/HT sour gas projects worldwide

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 Stainless Steel Channels – Annealed & Pickled – Subsea/Offshore Grade):

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