Super Duplex 2507 Stainless Steel Flat Bars

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), allowing for significantly thinner flat bar sections.

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: 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.

Square Edges: Precision-rolled square edges for accurate fitting and welding.

International Certifications: Flat bars 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 flat bars 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 Options:

l Pickled: Acid-treated, oxide-free, matte finish – standard for super duplex

l Grit Blasted: Matte, uniform surface texture – for paint adhesion

l Passivated: Chemically treated for enhanced corrosion resistance

Standard Thickness Ranges:

Standard Width Ranges:

Standard Lengths:

l  3000mm (3 meters)

l  6000mm (6 meters)

l  Custom lengths available upon request

Straightness Tolerances:

l  Standard: 2mm per meter

l  Precision: 1mm per meter (upon request)

*Formula: Weight (kg/m) = Width (mm) × Thickness (mm) × 0.00780*

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

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: Thickness, width, length, straightness, squareness.

Surface Inspection: Visual check for defects, cracks, seams.

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 Structures: Subsea manifold support brackets, PLET structural stiffeners, jumper connection plates, subsea distribution unit frames (ISO 13628-4 compliant, ABS/BV/DNV certified to 3000m).

HP/HT Sour Gas Platforms: Wellhead platform framework brackets, sour gas processing skid stiffeners, amine unit platform supports, gas dehydration unit frames (NACE MR0175 compliant).

Extreme Marine Brackets: Deepwater subsea equipment mounting brackets, ROV interface brackets, subsea connector supports, riser clamp brackets.

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

Desalination Plants (High Temperature): High-pressure brine vessel supports, energy recovery device brackets, evaporator structural frames, ZLD unit supports.

Flue Gas Desulfurization (FGD): Absorber tower support brackets, slurry tank stiffeners, quench nozzle supports, reheat duct frames.

Chemical Processing (Aggressive Acids): HP/HT heat exchanger supports, reactor vessel brackets, acid storage tank stiffeners for high-chloride service.

Geothermal Energy: High-temperature brine pipeline supports, steam condensate vessel brackets, reinjection well head frames.

1. What is the difference between Super Duplex 2507 and Duplex 2205 flat bars?
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 flat bars?
With proper design, Super Duplex 2507 structural components are suitable for water depths up to 3000 meters (10,000 feet) for subsea applications.

3. Can Super Duplex 2507 flat bars 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 flat bars?
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 flat bars 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.

6. What surface finish is required for super duplex flat bars?
Pickled finish is mandatory for super duplex service to remove the oxide scale and restore corrosion resistance. Grit blasting is acceptable for topside structures requiring paint.

Highest Strength Available: 3.2x stronger than 316L, 1.2x stronger than 2205 – significant weight reduction

Deepwater Subsea Certified: ABS, BV, DNV, LR certified to 3000m

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

NORSOK M-630 Qualified: Complete offshore documentation

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

Charpy Impact Tested: -46°C documented standard

G48 Corrosion Tested: Pitting resistance verified

Square Edges: Precision-rolled for accurate fabrication

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

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 Flat Bars – Pickled Finish – Subsea Grade):

Stock Examples (Super Duplex 2507 Stainless Steel Flat Bars – Grit Blasted – Topside Paint Grade):

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