Product Description
Super Duplex 32760 is the enhanced version of Super Duplex 2507, with the addition of copper (0.50-1.00%) and tungsten (0.50-1.00%) to provide superior resistance to reducing acids and improved pitting resistance. Also known by the trade name Zeron 100, this grade offers PREN values exceeding 40 and yield strength of 550 MPa, making it suitable for the most demanding offshore, subsea, and chemical environments.
Key characteristics include:
Exceptional corrosion resistance – PREN ≥ 40
Enhanced resistance to reducing acids – copper addition
Improved pitting resistance – tungsten addition
Highest strength among duplex stainless steels
Superior chloride stress corrosion cracking resistance
Excellent seawater performance
NACE MR0175 / ISO 15156 compliance
NORSOK M-630 compliance
Chemical Composition
| Element | UNS S32760 (F55) | Role |
| Chromium (Cr) | 24.0 – 26.0 | Oxidation resistance, corrosion resistance |
| Nickel (Ni) | 6.0 – 8.0 | Austenite stabilizer, corrosion resistance |
| Molybdenum (Mo) | 3.0 – 4.0 | Pitting and crevice corrosion resistance |
| Nitrogen (N) | 0.20 – 0.30 | Austenite stabilizer, strengthening |
| Copper (Cu) | 0.50 – 1.00 | Resistance to reducing acids |
| Tungsten (W) | 0.50 – 1.00 | Enhanced pitting resistance |
| Carbon (C) | ≤ 0.030 | Controlled for weldability |
| Manganese (Mn) | ≤ 1.00 | Deoxidizer |
| Silicon (Si) | ≤ 1.00 | Deoxidizer |
| Phosphorus (P) | ≤ 0.030 | Impurity control |
| Sulfur (S) | ≤ 0.010 | Impurity control |
| Iron (Fe) | Balance | Base element |
Room Temperature Properties (Solution Annealed)
| Property | UNS S32760 (F55) |
| Tensile Strength | ≥ 800 MPa (116 ksi) |
| Yield Strength (0.2% Offset) | ≥ 550 MPa (80 ksi) |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HB |
| Density | 7.80 g/cm³ |
| PREN (F55) | ≥ 40 |
| Critical Pitting Temperature (CPT) | ≥ 80°C |
Key Advantages of Super Duplex 32760
Superior Corrosion Resistance – Super Duplex 32760 offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride environments. With PREN ≥ 40, the alloy is suitable for the most demanding seawater and offshore applications.
Enhanced Reducing Acid Resistance – The copper addition (0.50-1.00%) provides superior resistance to reducing acids such as sulfuric acid and hydrochloric acid compared to Super Duplex 2507, expanding its application range in chemical processing.
Improved Pitting Resistance – The tungsten addition (0.50-1.00%) enhances pitting resistance in aggressive chloride environments, making it particularly suitable for high-temperature seawater applications where pitting is a critical concern.
Highest Strength Among Duplex Steels – Super Duplex 32760 provides the highest strength of any duplex stainless steel grade, with minimum yield strength of 550 MPa. This allows for significant weight reduction in structural and pressure-containing applications.
NACE MR0175 / ISO 15156 Compliance – Super Duplex 32760 is qualified for sour service applications, resisting sulfide stress cracking (SSC) and hydrogen induced cracking (HIC) in H₂S-containing environments.
NORSOK M-630 Compliance – The alloy meets the requirements of NORSOK M-630 for offshore applications, making it suitable for Norwegian continental shelf projects.
Excellent Weldability – Super Duplex 32760 can be welded using standard techniques with appropriate filler metals. Proper heat input control is essential to maintain correct ferrite-austenite balance.
Super Duplex 32760 vs Super Duplex 2507
| Property | Super Duplex 32760 (F55) | Super Duplex 2507 (F53) |
| Copper Content | 0.50 – 1.00% | ≤ 0.50% |
| Tungsten Content | 0.50 – 1.00% | – |
| Reducing Acid Resistance | Superior | Good |
| Pitting Resistance | Enhanced | Excellent |
| PREN | ≥ 40 | ≥ 40 |
| Yield Strength | ≥ 550 MPa | ≥ 550 MPa |
| Seawater Performance | Superior | Excellent |
| Sour Service | Excellent | Excellent |
| NORSOK M-630 | Yes | Yes |
| Cost | Higher | Slightly Lower |
| Trade Name | Zeron 100 | SAF 2507 |
Available Product Forms from Womic Steel
Seamless Pipe & Seamless Tube
Outside Diameter: 6mm – 300mm
Wall Thickness: 1mm – 30mm
Length: Up to 12m
Standards: ASTM A790, ASTM A789
Applications: Seawater piping, subsea flowlines, heat exchanger tubes, chemical process piping
Keywords: Super Duplex 32760 seamless pipe, UNS S32760 tube, F55 pipe, Zeron 100 pipe
Welded Pipe
Outside Diameter: 50mm – 1200mm
Wall Thickness: 1.0mm – 25mm
Standards: ASTM A790, ASTM A928
Applications: Large-diameter seawater systems, offshore platform piping
Keywords: Super Duplex 32760 welded pipe, F55 ERW pipe
Steel Bar (Round, Square, Flat, Hex)
Diameter: 6mm – 400mm
Surface: Hot rolled, Bright (cold drawn), Ground, Turned
Standards: ASTM A276, ASTM A479
Applications: Valve stems, fasteners, shafts, subsea components
Keywords: Super Duplex 32760 round bar, F55 bar stock, S32760 bar
Steel Plate & Sheet
Thickness: 1mm – 80mm
Width: Up to 2500mm
Standards: ASTM A240
Applications: Vessel shells, subsea structures, flange blanks
Keywords: Super Duplex 32760 plate, F55 sheet, S32760 plate
Flanges & Pipe Fittings
Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded
Sizes: 1/2" – 48"
Pressure Rating: Class 150 – Class 2500
Standards: ASTM A182, ASME B16.5, ASME B16.47
Keywords: Super Duplex 32760 flanges, F55 weld neck flange
Forgings
Types: Rings, disks, shafts, valve bodies, subsea components
Weight: Up to 4,000kg
Standards: ASTM A182
Keywords: Super Duplex 32760 forging, F55 ring, Zeron 100 forging
Super Duplex 32760 Valves
Types: Ball valves, Gate valves, Globe valves, Check valves
Sizes: 1/2" – 24"
Pressure Rating: Class 150 – Class 2500
Temperature Range: -50°C to +300°C
Design Standards: API 608, API 6D, ASME B16.34
Seating: Stellite hardfaced, RPTFE, PEEK
Keywords: Super Duplex 32760 ball valve, F55 gate valve, Zeron 100 valve
Standards & Specifications
| Product Form | ASTM Standard |
| Seamless Pipe/Tube | ASTM A790, ASTM A789 |
| Welded Pipe | ASTM A790, ASTM A928 |
| Bar/Rod | ASTM A276, ASTM A479 |
| Plate/Sheet/Strip | ASTM A240 |
| Forgings | ASTM A182 |
| UNS Designation | S32760 |
| W.Nr. | 1.4501 |
| EN | 1.4501 |
| F No. | F55 |
| NORSOK | M-630 |
Applications of Super Duplex 32760
Offshore Platforms and Subsea – Super Duplex 32760 is used in subsea trees, manifolds, connectors, flowlines, and subsea control systems where enhanced corrosion resistance is required in aggressive seawater and H₂S environments.
Seawater Systems – The alloy is ideal for seawater firewater systems, deluge systems, ballast systems, and cooling water systems requiring superior pitting resistance.
Chemical Processing – Super Duplex 32760's copper addition provides enhanced resistance to reducing acids, making it suitable for equipment handling mixed acid streams and chemical processing in aggressive environments.
Desalination Plants – The alloy is used in high-pressure seawater piping and brine handling equipment in desalination plants.
Frequently Asked Questions
Q: What is the difference between Super Duplex 32760 (F55) and Super Duplex 2507 (F53)?
A: Super Duplex 32760 contains copper (0.50-1.00%) and tungsten (0.50-1.00%) additions, providing enhanced resistance to reducing acids and improved pitting resistance. Both offer PREN ≥ 40 and yield strength ≥ 550 MPa, but F55 is the preferred choice for applications involving reducing acids or requiring the highest level of corrosion resistance.
Q: Is Super Duplex 32760 suitable for seawater service?
A: Yes. With PREN ≥ 40 and tungsten addition, Super Duplex 32760 provides exceptional seawater corrosion resistance, making it suitable for subsea equipment, offshore platform seawater systems, and desalination plants.
Q: What is Zeron 100?
A: Zeron 100 is the trade name for Super Duplex 32760, developed by Rolled Alloys. It is equivalent to UNS S32760 and F55, known for its enhanced corrosion resistance from copper and tungsten additions.
Q: Can Super Duplex 32760 be welded?
A: Yes. Super Duplex 32760 is weldable using GTAW, GMAW, SMAW, and SAW processes. Filler metal ER2594 is recommended. Control of heat input and interpass temperature is critical.
Q: What is the maximum service temperature for Super Duplex 32760?
A: The recommended maximum service temperature is 300°C (572°F). Above this temperature, the alloy is susceptible to embrittlement due to sigma phase precipitation.
Contact Womic Steel
Website: www.womicsteel.com
E-mail: sales@womicsteel.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for Super Duplex 32760 (UNS S32760 / F55) seamless pipe, welded pipe, steel bar, steel plate, steel coil, flanges, fittings, forgings, and valves for offshore platforms, subsea equipment, seawater systems, and chemical processing applications worldwide. Full traceability, NACE MR0175 compliance, NORSOK M-630, and EN 10204 Type 3.1/3.2 documentation available.
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