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Quality Super Duplex Stainless Steel Plate High Strength Corrosion Resistant factory
Quality Super Duplex Stainless Steel Plate High Strength Corrosion Resistant factory
Quality Super Duplex Stainless Steel Plate High Strength Corrosion Resistant factory
Quality Super Duplex Stainless Steel Plate High Strength Corrosion Resistant factory

Super Duplex Stainless Steel Plate High Strength Corrosion Resistant

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Super Duplex Stainless Steel Plate

Duplex Stainless Steel Plate High Strength

Stainless Steel Duplex Plate Corrosion Resistant
Product Summary
Super duplex stainless steel plate is a high-performance material that combines the advantageous properties of both austenitic and ferritic stainless steel microstructures. With a balanced duplex microstructure (approximately 50% ferrite / 50% austenite), super duplex grades offer approximately ...

Product Details

Highlight:

Super Duplex Stainless Steel Plate

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Duplex Stainless Steel Plate High Strength

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Stainless Steel Duplex Plate Corrosion Resistant
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

Super duplex stainless steel plate is a high-performance material that combines the advantageous properties of both austenitic and ferritic stainless steel microstructures. With a balanced duplex microstructure (approximately 50% ferrite / 50% austenite), super duplex grades offer approximately twice the yield strength of conventional austenitic stainless steels (e.g., 304, 316) while providing exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.

These plates are specifically designed for extreme service conditions involving high chloride concentrations, elevated temperatures, and aggressive chemical environments. Common applications include offshore platforms, seawater desalination plants, chemical processing vessels, and sour gas pipelines.

Typical Grades: UNS S32750 (EN 1.4410 / SAF 2507 / F53), UNS S32760 (EN 1.4501 / Zeron 100 / F55)

Key Features & Benefits
Feature Benefit
High Strength Yield strength ≥ 550 MPa – allows weight reduction through thinner gauges
Excellent Corrosion Resistance PREn (Pitting Resistance Equivalent Number) > 40 – superior to 316L and standard duplex
Stress Corrosion Cracking Resistance Highly resistant to chloride-induced SCC – ideal for marine and chemical applications
Good Weldability Can be welded using standard methods with matching filler metals
High Thermal Conductivity Better heat transfer than austenitic grades – beneficial for heat exchangers
Low Thermal Expansion Reduced thermal stress compared to austenitic stainless steels
Chemical Composition (wt% – typical for UNS S32750 / S32760)
Element UNS S32750 (2507 / 1.4410 / F53) UNS S32760 (Zeron 100 / 1.4501 / F55)
Carbon (C) ≤ 0.030 ≤ 0.030
Chromium (Cr) 24.0 – 26.0 24.0 – 26.0
Nickel (Ni) 6.0 – 8.0 6.0 – 8.0
Molybdenum (Mo) 3.0 – 5.0 3.0 – 4.0
Nitrogen (N) 0.24 – 0.32 0.20 – 0.30
Manganese (Mn) ≤ 1.20 ≤ 1.00
Silicon (Si) ≤ 0.80 ≤ 1.00
Phosphorus (P) ≤ 0.035 ≤ 0.030
Sulfur (S) ≤ 0.020 ≤ 0.010
Copper (Cu) ≤ 0.50 0.50 – 1.00
Tungsten (W) — 0.50 – 1.00
Iron (Fe) Balance Balance

Note: The addition of tungsten (W) and copper (Cu) in UNS S32760 further enhances corrosion resistance in specific aggressive environments.

Mechanical Properties
Property UNS S32750 UNS S32760
Tensile Strength (MPa), min 800 800
Yield Strength (MPa), min 550 550
Elongation (%), min 15 15
Hardness (HB), max 310 310
Hardness (HRC), max 32 32
Impact Toughness (J, min @ -40°C) 40 40
Physical Properties
Property Value (Typical)
Density 7.8 g/cm³
Melting Range 1350 – 1400 °C
Modulus of Elasticity 200 GPa
Thermal Conductivity (20°C) 15 W/(m·K)
Specific Heat Capacity (20°C) 480 J/(kg·K)
Electrical Resistivity 0.8 µΩ·m
Thermal Expansion Coefficient (20–100°C) 13.5 * 10⁻⁶ /K
PREn (Pitting Resistance Equivalent) > 40

PREn calculation: PREn = %Cr + 3.3*%Mo + 16*%N

Product Specifications – Super Duplex Plate
Parameter Range / Details
Material Grades UNS S32750 / UNS S32760 (EN 1.4410 / 1.4501 / SAF 2507
Manufacturing Process Hot rolled / Cold rolled
Thickness 2 mm – 100 mm
Width 1000 mm – 3200 mm
Length 2000 mm – 12000 mm
Thickness Tolerance ASTM A480 (typical ±0.1 mm to ±0.5 mm depending on thickness)
Width / Length Tolerance 0 / +5 mm (typical)
Surface Finish Hot rolled & pickled (No.1) / Cold rolled & pickled (2B) / Bright annealed (BA) / Polished / Blasted
Edge Condition Mill edge / Sheared edge / Flame cut
Delivery Condition Solution annealed (quenched in water or rapid cooling) + pickled or blasted
Heat Treatment 1040 – 1120 °C, followed by rapid cooling
Testing PMI, Hydrostatic (for pipe), UT, Mechanical, Corrosion (ASTM G48), Ferrite measurement

Custom sizes available upon request.

Dimensions & Size Availability
Thickness (mm) Width (mm) Length (mm) Typical Applications
2 – 5 1000 – 2000 2000 – 6000 Pressure vessels, liners, baffles
6 – 20 1500 – 2500 3000 – 8000 Structural plates, offshore topsides
21 – 50 1500 – 3200 4000 – 10000 Heavy fabrication, pipe spools
51 – 100 1500 – 3000 4000 – 8000 Flanges, heavy machinery components
Surface Finishes for Super Duplex Plate
Finish Code Description Typical Application
No.1 (Hot rolled, annealed & pickled) Rough, matte surface, oxide-free General industrial fabrication
2B (Cold rolled, annealed & pickled) Smooth, matte finish Precision components, moderate surface requirement
BA (Bright Annealed) Bright, reflective finish (cold rolled + bright annealing) Decorative, hygienic applications
Polished (No.4 / No.8) Brushed or mirror finish Architectural, food processing
Blasted (bead or shot) Uniform matte texture Pressure vessels, marine structures
Heat Treatment Requirements
Parameter Requirement
Solution Annealing Temperature 1040 – 1120 °C
Cooling Method Water quenching or rapid cooling (air cooling not recommended for thick sections)
Cooling Rate As fast as possible to avoid intermetallic phase precipitation (σ, χ)
Post-Heat Treatment Generally not required for welded structures; re-solution annealing may be needed after certain hot working operations

Critical Warning: Super duplex stainless steels are susceptible to embrittlement from sigma (σ) phase and chi (χ) phase precipitation when exposed to temperatures in the range of 300–950°C for prolonged periods. Avoid slow cooling through this range.

Quality Control & Testing

Each super duplex plate is subject to rigorous quality control in accordance with ASTM A240 / A480 and customer specifications:

Test / Inspection Standard / Method Frequency
Chemical Analysis Per heat (OES) Each heat
Tensile Testing Room temperature / Elevated (if required) Per heat/per thickness
Hardness Testing Brinell or Rockwell per plate or per batch
Impact Testing (Charpy V-notch) At -40°C or -46°C (as specified) Per heat/direction
Intergranular Corrosion Test ASTM A262 Practice E or C Upon request
Pitting Corrosion Test ASTM G48 (Critical Pitting Temperature / CPT) Upon request
Ferrite Content Measurement Metallographic or magnetic Upon request
Ultrasonic Testing (UT) ASTM A435 / A577 / A578 Upon request
PMI (Positive Material Identification) XRF 100% upon request
Visual & Dimensional Inspection Per A480 100%

Certificates Available:

  • Mill Test Certificate (EN 10204 3.1)

  • Third-party inspection report (SGS, BV, DNV, TUV – upon request)

  • NACE MR0175 / ISO 15156 compliance certificate

  • Heat treatment charts (time-temperature records)

  • UW-30 (ASME Section VIII) data report (if applicable)

Typical Applications – Extreme Corrosive Environments
Industry Application Why Super Duplex
Offshore Oil & Gas Topside modules, subsea manifolds, flowline jumpers, risers High strength, seawater corrosion resistance, SCC resistance
Desalination Evaporator vessels, brine heaters, and high-pressure piping PREn >40 resists chloride pitting and crevice corrosion
Chemical Processing Reactors, distillation columns, and heat exchangers for acetic/formic acid Resists organic acids and chloride contamination
Pulp & Paper Digesters, bleach plants (chlorine dioxide) High strength reduces thickness and corrosion resistance
Flue Gas Desulfurization (FGD) Scrubbers, ductwork, absorber towers Resists high-chloride, low-pH environments
Marine & Shipbuilding Seawater cooling systems, firewater mains, propeller shafts Excellent seawater corrosion resistance, erosion resistance
Hydrometallurgy Autoclaves, pressure leach vessels for nickel/cobalt extraction Handles high chloride + acid + elevated temperature
Chemical Tankers Cargo tanks for aggressive chemicals (e.g., sulfuric, phosphoric acid) High strength allows lighter tank construction
Comparison: Super Duplex vs. Standard Duplex vs. Austenitic
Property 316L (Austenitic) 2205 (Duplex) Super Duplex (S32750/S32760)
Yield Strength (MPa) ~220 ~450 ~550
Tensile Strength (MPa) ~520 ~620 ~800
PREn ~25 ~35 >40
Critical Pitting Temperature (°C in 6% FeCl₃) ~15 ~35 ~50+
Chloride SCC Resistance Poor (susceptible) Excellent Excellent
Cost (relative to 316L) 1.0x ~1.3x ~1.8x
Typical Applications General purpose Moderate chloride Extreme chloride / sour
Fabrication Guidelines
Cutting

  • Plasma cutting, laser cutting, water jet, or mechanical shearing

  • For thermal cutting, apply paste or grinding to remove the heat-affected zone (HAZ) if corrosion resistance is critical

Forming (Cold)

  • Super duplex has higher strength – requires greater force than austenitic grades

  • Springback is higher – adjust tooling accordingly

  • Annealed condition recommended for severe forming

Welding

  • Filler metals: Matching super duplex (e.g., 2509 for S32750, 2594 for S32760)

  • Heat input: 0.5 – 2.5 kJ/mm typical

  • Interpass temperature: ≤ 150°C

  • Preheating: Generally not required (but optional for heavy sections)

  • Post-weld heat treatment: Not normally required for corrosion resistance; may be needed for dimensional stability

Machining

  • Use rigid setups and sharp carbide tooling

  • Lower cutting speeds (20–30% less than 316L)

  • Use positive rake angles and adequate coolant

Packaging & Logistics
Item Method
Plate Packaging Paper interleaving between plates, moisture-proof paper wrapping, steel strapping, plywood pallet, or wooden skid
Edge Protection Cardboard corner protectors
Surface Protection Removable PVC film (on polished or 2B finishes) – optional
Marking Grade, dimensions, heat number, standard, and inspection stamp clearly stenciled or labeled
Documentation Packing list, MTC, commercial invoice, (if applicable: COO, third-party report)
Port of Loading Major Chinese ports (Shanghai, Tianjin, Ningbo, Guangzhou)
Shipping Terms FOB, CFR, CIF, EXW
Contact Us

For inquiries, technical support, or to request a quotation for super duplex stainless steel plates, please contact our sales team using the information below. All messages will be responded to within 24 hours.

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