When an offshore deepwater platform faced catastrophic equipment failures from aggressive H2S and chloride-laden wellhead conditions, conventional duplex stainless steel proved inadequate, costly repairs cascaded and safety margins eroded. The transformative solution came from a single material switch: Super Duplex 32750 Sheets. This next-generation duplex alloy, engineered with 25% chromium, 7% nickel, 4% molybdenum, and critical nitrogen enhancement, delivered three to four times the strength of standard austenitic 316L while providing unmatched resistance to stress corrosion cracking. Suddenly, equipment lasted longer, maintenance intervals extended dramatically, and safety margins expanded. Today, Aurico Alloys LLP supplies certified Super Duplex 32750 Sheets (UNS S32750, SAF 2507) to procurement leaders, engineers, fabricators, and OEMs across chemical, oil & gas, marine, pharmaceutical, and power generation industries worldwide enabling critical projects where failure is impossible and performance is non-negotiable.
Table of Contents:
Super Duplex 32750 (UNS S32750, EN 1.4410, SAF 2507, ASTM A240) represents the pinnacle of duplex stainless steel technology a precisely balanced microstructure combining ~50% austenite and ~50% ferrite phases engineered for extreme service conditions where both ultra-high strength and aggressive corrosion resistance are mandatory. With 24-26% chromium, 6-8% nickel, 3-5% molybdenum, and 0.24-0.32% nitrogen, Super Duplex 32750 achieves a Pitting Resistance Equivalent Number (PREN) of ~42 substantially exceeding standard duplex 2205 (PREN ~35) and dramatically outperforming 316L austenitic steel (PREN ~25). The dual-phase microstructure delivers minimum tensile strength of 750 MPa (109 ksi) and yield strength of 550 MPa (80 ksi) making it three to four times stronger than 316L while resisting chloride stress corrosion cracking (SCC), pitting, crevice corrosion, erosion corrosion, and corrosion fatigue in the most hostile chemical, marine, and sour gas environments.
Aurico Alloys LLP provides ASTM A240 and ASME SA240 certified Super Duplex 32750 Sheets in thickness ranges 0.2mm to 4.75mm and widths up to 3000mm, in hot-rolled, cold-rolled, annealed, pickled, and polished finishes. Every batch includes complete mill test certificates, ASTM/EN certifications, impact toughness documentation, and full traceability for global regulatory compliance. Our extensive inventory supports both urgent offshore repairs and large-scale OEM fabrication with direct-from-stock delivery and custom cutting capabilities.
Specifying Aurico's Super Duplex 32750 Sheets means choosing a material engineered to excel where no compromise exists delivering unmatched combinations of mechanical strength (allowing 30-50% weight reduction), corrosion immunity in aggressive sour gas/chloride environments, excellent weldability, superior fatigue and impact resistance, and proven long-term reliability across the world's most demanding industrial applications. This is not merely an upgrade; it is a strategic investment in operational safety, asset longevity, and lifecycle cost optimization.
High-quality Super Duplex 32750 Sheets ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | Super Duplex 32750 (UNS S32750, SAF 2507, EN 1.4410) |
| Standards | ASTM A240, ASME SA240, EN 10028-7, NACE MR0175 |
| Thickness Range | 0.2 mm – 4.75 mm |
| Width | Up to 3000 mm |
| Length | Up to 12000 mm (custom available) |
| Finish | Hot rolled, cold rolled, 2B, 2D, BA, No.1, No.4, pickled, polished |
| Forms | Sheets, plates, coils, strips, blanks |
| Certification | Full Mill Test Certificates, ASTM/EN/NACE, RoHS/REACH, EN 10204 3.1, traceability |
| Price | INR 900 – 1,500 per kg. Indicative USD 11 – 18 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | S32750 |
| Werkstoff / EN number | 1.4410 |
| EN designation | X2CrNiMoN25-7-4 |
| Density | 7.80 g/cm3 |
| Melting range | 1445 °C |
| Specific heat (20 °C) | 460 J/kg·K |
| Thermal conductivity (20 °C) | 13.5 W/m·K |
| Coefficient of expansion (20–200 °C) | 14.0 µm/m·K |
| Coefficient of expansion (20–400 °C) | 14.5 µm/m·K |
| Electrical resistivity (20 °C) | 0.8 Ω·mm²/m |
| Young's modulus (20 °C) | 200 GPa |
| Magnetic | yes |
| Oil and gas conformance | NACE MR0175 / ISO 15156-3 · NACE MR0103 / ISO 17945 · Norsok M-630 MDS D55 (Aperam DX2507 Technical Data Sheet) |
| Plate, sheet and strip specification | ASTM A240 |
Identifiers and physical constants for Duplex 32750. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico Alloys LLP maintains strategic inventory of Super Duplex 32750 Sheets in all popular thicknesses and finishes, supporting immediate dispatch for chemical, oil & gas, marine, pharmaceutical, and power generation projects globally. Urgent shutdown support, OEM large-volume fabrication, precision custom cutting, and technical guidance are available on demand.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.025 nominal | |
| Chromium (Cr) | 25.8 nominal | |
| Nickel (Ni) | 7.0 nominal | |
| Molybdenum (Mo) | 3.8 nominal | |
| Nitrogen (N) | 0.27 nominal | |
| Manganese (Mn) | 0.8 nominal | |
Nominal composition for Duplex 32750. These are nominal figures rather than acceptance limits, and they are not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 730 – 930 (106 – 135 ksi) |
| Yield Strength (0.2%, MPa) | ≥530 (≥77 ksi) |
| Elongation (%) | ≥25 |
| Hardness (HB) | 250 – 290 |
| Impact Energy at 20°C (J) | ≥100 |
| Impact Energy at -40°C (J) | ≥40 |
| Modulus of Elasticity (GPa) | 200 |
| PREN (Pitting Resistance) | ~42 |
| Max Service Temperature (°C) | Up to 300 continuous, 600 intermittent |
Applications & Benefits
- Oil & Gas Offshore: Deepwater wellheads, subsea equipment, production manifolds, umbilicals, risers in H2S and chloride-rich environments
- Chemical & Petrochemical: Pressure vessels, reactors, heat exchangers, acid-handling piping, organic acid plants (terephthalic acid), highly corrosive process equipment
- Marine & Desalination: Seawater-cooled exchangers, reverse osmosis plants, desalination membrane housings, marine structural components, offshore platforms
- Pharmaceutical & Biotech: Ultra-clean reactors, sterile vessel manufacturing, high-purity piping systems requiring minimal contamination
- Power Generation & Wastewater: Flue gas desulfurization (FGD) equipment, turbine components, water treatment vessels, cooling circuits, pulp & paper digesters
- OEM & Heavy Fabrication: High-strength structural components (30-50% weight reduction vs. austenitic steel), custom pressure equipment, critical lifting hardware
FAQ & Insights
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Aurico Alloys LLP's Super Duplex 32750 Sheets deliver unmatched engineering value combining three to four times the strength of 316L austenitic steel with superior chloride and stress corrosion cracking resistance, enabling weight reduction, extended service life, and proven reliability in sour gas, deepwater, chemical, marine, pharmaceutical, and power generation applications where margin for error simply does not exist. When your project demands materials that deliver both extreme strength and aggressive corrosion immunity, enabling thinner construction and lower lifecycle costs in the world's harshest environments, are you ready to leverage Aurico's certified Super Duplex 32750 Sheets as your strategic material advantage?