Super Duplex 32760 Plates | UNS S32760 High-Strength Seawater & Chloride Protection for Chemical, Oil & Gas, Marine, Pharma & Power
Table of Contents:
A North Sea gas platform had already cycled through 316L, 904L and even Duplex 2205 on its firewater ring mains, riser clamps and splash‑zone manifolds, yet every inspection still revealed new pitting around welds, crevice corrosion under supports and hairline cracks where warm natural seawater, CO₂ and vibration met. When the integrity and procurement teams rebuilt those systems in Super Duplex 32760 Plates (UNS S32760, 1.4501, F55), they chose a super duplex stainless steel with roughly 25% chromium, 7% nickel, about 3–3.6% molybdenum and 0.24–0.32% nitrogen whose PREN exceeds 40, whose typical plate data list 0.2% yield strength around 550 MPa, tensile strength around 750–800 MPa, elongation about 25%, and whose critical pitting temperatures in chloride test solutions often reach 70–90 °C; subsequent thickness surveys showed corrosion rates in seawater falling below about 0.005 mm/year and stress corrosion cracking indications disappearing even in heated, aerated brines.
Super Duplex 32760 is a highly alloyed super duplex stainless steel that combines an approximately 50/50 austenite–ferrite microstructure with high chromium, molybdenum, nickel and nitrogen contents to deliver very high strength and outstanding resistance to pitting, crevice corrosion and chloride stress‑corrosion cracking. Datasheets describe UNS S32760 as having typical composition ranges of about 24–26% chromium, 6–8% nickel, 3–5% molybdenum, 0.24–0.32% nitrogen, with manganese normally ≤1.2%, silicon ≤0.8%, carbon ≤0.03%, phosphorus ≤0.035%, sulfur ≤0.02% and copper up to about 0.5%, with iron as the balance, and highlight PREN values above 40 as a key differentiator versus standard duplex grades.
For procurement heads, design and corrosion engineers, fabricators, OEM manufacturers and hardware or industrial supply stores serving chemical, oil & gas, marine, pharma and power‑generation sectors, Super Duplex 32760 plates address the point where 316L, 904L and Duplex 2205 cannot deliver the required safety margins in warm seawater, concentrated brines, sour gas and mixed acid–chloride service. Mechanical property tables for S32760 show a minimum 0.2% proof stress of about 550 MPa, minimum tensile strength around 750 MPa and minimum elongation around 25% for plate, which together permit thinner designs at the same design pressure and provide better fatigue and erosion‑corrosion resistance than lower‑strength austenitic options. Corrosion reviews note that Duplex 32760 exhibits PREN values typically greater than 42, critical pitting temperatures over 70–80 °C in standard chloride tests and general corrosion rates in seawater below 0.005 mm/year, while SCC threshold stresses exceed yield strength in many chloride environments, effectively eliminating chloride‑induced stress‑corrosion cracking as a normal failure mode.
High-quality Super Duplex 32760 Plates ready for industrial use.
Specification Overview
| Supplier & Role | Aurico Alloys LLP – Super Duplex 32760 Plates supplier, stockist, exporter in India to abroad |
|---|---|
| Alloy Description | Highly alloyed super duplex stainless steel for aggressive seawater, chloride and sour‑service environments combining high strength with exceptional resistance to localised corrosion and SCC |
| UNS / EN / Werkstoff | UNS S32760, EN 1.4501, often known commercially as ZERON 100 or F55 in forging designation systems |
| Main Plate Standards | ASTM A240 / ASME SA‑240 UNS S32760 plate, sheet and strip, with many products supplied to NORSOK M‑630 material data sheets for offshore use |
| Thickness Range | 4.75 mm – 150 mm |
| Pitting Resistance (PREN) | PREN typically >40–42, providing outstanding resistance to pitting and crevice corrosion in seawater and other chloride‑containing environments |
| Price | INR 1,000 – 1,750 per kg. Indicative USD 12 – 21 per kg; quoted against grade, form, size and quantity. |
UNS & Equivalent Grades
| Property | Value |
|---|---|
| UNS number | S32760 |
| Werkstoff / EN number | 1.4501 |
| EN designation | X2CrNiMoCuWN25-7-4 |
| Density | 7.80 g/cm3 |
| Plate, sheet and strip specification | ASTM A240 |
Identifiers and physical constants for Duplex 32760. A dash means no such designation is published for this grade.
Stock & Product Availability
As a Super Duplex 32760 Plates stockist, Aurico Alloys LLP can offer plate and sheet sizes suitable for firewater and seawater piping supports, riser clamps, manifolds, scrubber and absorber shells, tube sheets, channel covers and structural parts in chemical, oil & gas, marine, pharma and power‑generation projects within the thickness and width ranges described for ASTM A240 UNS S32760 plate.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.030 |
| Manganese (Mn) | — | 1.00 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.010 |
| Silicon (Si) | — | 1.00 |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 4.0 |
| Nitrogen (N) | 0.20 | 0.30 |
| Copper (Cu) | 0.50 | 1.00 |
| Tungsten (W) | 0.50 | 1.00 |
Composition limits for Duplex 32760. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property (Room Temperature, Plate) | Typical Value – Super Duplex 32760 |
|---|---|
| Ultimate Tensile Strength | ≥750–800 MPa (≈109–116 ksi) minimum for plate |
| 0.2% Yield Strength | ≥550 MPa (≈80 ksi) minimum for plate, giving roughly twice the yield strength of many austenitic stainless steels |
| Elongation | ≥25% minimum in plate form |
| Hardness | Brinell hardness typically limited to 270–290 HBW in plate specifications |
| Melting Point | ≈1350 °C (≈2460 °F) |
| PREN | Typically >40–42, indicating very high pitting and crevice corrosion resistance in chloride media |
| Stress‑Corrosion Cracking | Corrosion reviews highlight superior resistance to chloride SCC with SCC threshold stresses often above yield strength, even in boiling seawater and concentrated brines. |
Applications & Benefits
- Chemical & Oil & Gas: Super Duplex 32760 plates are used in pressure vessels, heat exchangers, manifolds, pipe spools and subsea structures handling CO₂, H₂S, chlorides and acidic brines where carbon steel, 316L, 904L and Duplex 2205 suffer rapid pitting, SCC or CO₂/H₂S corrosion.
- Marine & Desalination: In seawater cooling circuits, desalination plants, splash‑zone components and coastal infrastructure, UNS S32760 / 1.4501 plates exploit PREN >40 and high CPT to maintain integrity in warm, aerated seawater and high‑salinity brines where conventional stainless steels pit quickly.
- Pharma & Power: For pharma utilities, FGD absorbers, condensers and coastal power‑plant balance‑of‑plant, S32760 offers high strength, high thermal conductivity and good corrosion‑fatigue resistance, supporting thinner walls, lighter equipment and longer inspection intervals.
FAQ & Search Trends
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Conclusion
Super Duplex 32760 Plates from Aurico Alloys LLP, supplied to UNS S32760 / EN 1.4501 chemistry limits and ASTM A240 mechanical requirements, give chemical, oil & gas, marine, pharma and power‑generation users a super duplex solution that combines very high strength, PREN >40 and exceptional resistance to seawater, chlorides and sour service in their most critical assets are your highest‑risk seawater, brine and chloride‑exposed systems still relying on lower‑alloy plates instead of optimised Super Duplex 32760 plates?