Super Duplex 2507 Stainless Steel Plates

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: Plates 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). The high nitrogen content promotes austenite stability, significantly increases pitting resistance, and enhances mechanical strength. PREN = %Cr + 3.3 × %Mo + 16 × %N ≥ 42 (typically 42–45).

Comparison of PRE (Pitting Resistance Equivalent) Values:

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

l  Longitudinal: ≥ 70 J (typical)

l  Transverse: ≥ 50 J (typical)

Comparison of Strength (Super Duplex 2507 vs Other Grades):

Maximum Recommended Service Temperatures:

Critical Note: Super Duplex 2507 is not recommended for prolonged service above 300°C due to the risk of embrittling intermetallic phase precipitation (sigma phase). For plate applications above 300°C, austenitic grades (321/347/310S) should be considered.

Heat Treatment Condition:
Super Duplex 2507 stainless steel plates 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 (sigma, chi) that form readily in super duplex grades, relieves internal stresses from rolling, 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. The quenching delay must be kept under 30 seconds after opening the furnace.

Delivery Condition:
Plates are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance. Pickling removes the oxide scale formed during heat treatment and restores the passive surface. Bright annealing is not recommended for super duplex grades due to the water quenching requirement.

Thickness Tolerances (Hot-Rolled – ASTM A480):

Width and Length Tolerances (Hot-Rolled – ASTM A480):

Chemical Analysis: PMI 100% verification using handheld XRF spectrometer for Cr (24-26%), Ni (6-8%), Mo (3-5%), N (0.24-0.32%).

Ferrite Content Measurement: Magnetic induction (ferritoscope) or metallographic method – requirement: 35–65% ferrite (minimum 40% for sour service).

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

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

Charpy Impact Testing: Per NORSOK M-630 at -46°C – ≥70J typical for longitudinal.

Pitting Corrosion Test: ASTM G48 Method A – 24 hours in 6% FeCl₃ at 40°C (or 50°C for NORSOK) – no pitting allowed.

Critical Pitting Temperature (CPT): ASTM G48 Method C – optional upon request.

Ultrasonic Testing (UT): Per ASTM A435 for internal flaw detection (upon request).

Sour Service Qualification (upon request): HIC per NACE TM0284, SSC per NACE TM0177.

NACE MR0175 / ISO 15156 Compliance: Full documentation with hardness verification.

NORSOK M-650 Qualification: Complete documentation package available upon request.

Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available upon customer request.

Deepwater Subsea Oil & Gas: Subsea manifold plates, pipeline end termination (PLET) structural plates, jumper connection plates, subsea distribution unit housings, umbilical termination assembly plates (ISO 13628-4 compliant, ABS/BV/DNV certified to 3000m).

HP/HT Sour Gas Facilities: Wellhead platform plates, sour gas processing pressure vessel shells, amine unit tank plates, gas dehydration unit shells, produced water treatment vessel plates (NACE MR0175 compliant).

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

Desalination Plants (High Temperature): High-pressure brine vessel plates, energy recovery device housings, evaporator shells, multi-stage flash (MSF) evaporator plates, zero liquid discharge (ZLD) tank plates.

Flue Gas Desulfurization (FGD): Absorber tower plates, slurry tank plates, quench nozzle housings, reheat duct plates, scrubber vessel plates – for high-chloride, low-pH zones.

Chemical Processing (Aggressive Acids): HP/HT heat exchanger plates, reactor vessels, acid storage tanks, high-chloride organic compound process vessels.

Hydrometallurgy: Pressure acid leaching (PAL) vessel plates, high-temperature solvent extraction tanks, electrowinning cell housings.

Geothermal Energy: High-temperature, high-chlorine, high-H₂S brine pipeline plates, steam condensate vessels, reinjection well head structures.

Pressure Vessels: ASME code pressure vessel plates for extreme sour service, high-pressure storage tanks.

Womic Steel offers precision cutting services for Super Duplex 2507 stainless steel plates:

Standard Packaging:

Plates wrapped with moisture-proof paper and VCI film

Edge protectors to prevent damage

Steel skids for plate protection

Clear labeling with grade (S32750/F53), heat number, dimensions, weight, 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 and padded supports prevent plate damage

Efficient document preparation (NORSOK M-630 documentation, NACE compliance certificates, MTR, PMI reports, ferrite measurement records, corrosion test reports, Charpy impact test reports) minimizes customs delays

Continuous cargo tracking and after-sales follow-up

1. What is the difference between Super Duplex 2507 and Duplex 2205 plates?
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 plates?
With proper design, Super Duplex 2507 plate structures are suitable for water depths up to 3000 meters (10,000 feet) for subsea applications. External pressure collapse rating verified per API 17D.

3. Can Super Duplex 2507 plates 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 plates?
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 plates 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 for duplex stainless steels. HIC and SSC test reports available upon request.

6. Are Super Duplex 2507 plates available with ASME SA240 certification?
Yes. Super Duplex 2507 plates can be supplied with ASME SA240 certification for pressure vessel applications. Full traceability and testing documentation included.

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 for sour service

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

ASME SA240 Certified: Pressure vessel grade plates available

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 plate – traceable to original mill certificate

Complete Size Range: Thickness from 3mm to 80mm – standard and custom sizes

Cut-to-Size Services: Plasma, waterjet, and shearing for custom dimensions

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

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Super Duplex 2507 stainless steel plates. We offer certified quality, NORSOK M-630 compliance, NACE MR0175 certification, ferrite-controlled material, ASME SA240 certification, and reliable global delivery for your deepwater subsea and HP/HT sour gas projects.

Stock Examples (Hot-Rolled Super Duplex 2507 Plates – No.1 Finish – Subsea/Offshore Grade):

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