ASTM A240 UNS S32760 Super Duplex Stainless Steel Plate
Short Description:
ASTM A240 UNS S32760 super duplex stainless steel plate offers high strength and excellent chloride corrosion resistance for offshore, marine, pressure vessel and chemical equipment. Custom thickness, cutting, polishing, MTC and EN 10204 3.1 available.
UNS S32760 Super Duplex Stainless Steel Plate is a high-strength super duplex stainless steel plate grade commonly identified as F55, EN 1.4501 and Zeron 100 type material. It combines a ferritic-austenitic duplex microstructure with high chromium, molybdenum, nitrogen, tungsten and copper additions for offshore, marine, pressure equipment, pump, valve and chemical-process plate components.
SAKY STEEL supplies ASTM A240 / ASME SA240 UNS S32760 stainless steel plate and cut plate in No.1, pickled, polished or custom surface condition. Thickness, width, length, cutting, edge preparation, polishing, PMI, dimensional inspection, MTC and EN 10204 3.1 documentation can be provided when specified.
Product Parameters
| Item | Product Details |
|---|---|
| Product Name | UNS S32760 Super Duplex Stainless Steel Plate |
| Grade | UNS S32760 / F55 / 1.4501 |
| Material Family | Super duplex stainless steel |
| Product Shape | Plate, sheet and cut plate |
| Size Range | Regular and custom plate sizes by order |
| Thickness | Custom thickness according to project requirement |
| Surface Finish | No.1, pickled, 2B, polished |
| Delivery Condition | Solution annealed when required |
| Standard | ASTM A240 / ASME SA240 |
| Tolerance | Standard or drawing-specific tolerance |
| Available Services | Cutting, polishing, edge preparation, machining |
| Certificates | MTC, EN 10204 3.1, PMI report |
Chemical Composition
UNS S32760 contains high chromium, molybdenum and nitrogen with tungsten and copper additions. This chemistry supports high PREN value, strong pitting resistance and good performance in many chloride-containing environments.
| Element | Typical Reference Content | Technical Function |
|---|---|---|
| Carbon | ≤ 0.03% | Supports weldability and corrosion resistance |
| Chromium | 24.0–26.0% | Improves passivation and pitting resistance |
| Nickel | 6.0–8.0% | Balances duplex microstructure and toughness |
| Molybdenum | 3.0–4.0% | Improves crevice and chloride pitting resistance |
| Nitrogen | 0.20–0.30% | Increases strength and stabilizes austenite |
| Copper | 0.50–1.00% | Supports resistance in selected acidic media |
| Tungsten | 0.50–1.00% | Improves localized corrosion resistance |
| Manganese | ≤ 1.00% | Controlled for melting and structure balance |
| Silicon | ≤ 1.00% | Deoxidation and processing control |
| Iron | Balance | Base metal matrix |
Actual chemical composition shall be confirmed by the applicable product specification and MTC.
Mechanical and Corrosion Properties
The following values are typical references for ASTM A240 / ASME SA240 UNS S32760 plate in solution-annealed condition at room temperature. Actual values depend on plate thickness, heat treatment, test direction and the applicable specification.
| Property | Typical Reference | Condition | Engineering Meaning |
|---|---|---|---|
| Tensile Strength | ≥ 750 MPa reference | Solution annealed plate | High load-bearing capability |
| Yield Strength | ≥ 550 MPa reference | Solution annealed plate | Higher strength than many austenitic stainless steels |
| Elongation | ≥ 25% reference | Room temperature | Maintains useful ductility |
| Hardness | ≤ 310 HBW reference | Plate specification dependent | Helps verify delivery condition |
| Density | About 7.8–8.0 g/cm³ | Typical physical reference | Used for plate weight calculation |
| PREN | About 40+ typical | Composition dependent | Indicates strong localized corrosion resistance |
| Corrosion Resistance | High resistance to chloride pitting and SCC | Environment dependent | Useful for offshore and marine equipment |
Common Size Table
| Thickness | Width | Length | Surface | Typical Processing |
|---|---|---|---|---|
| 1–6 mm | Custom width | Coil cut or sheet length | 2B / Pickled | Sheet and thin plate fabrication |
| 8–20 mm | Custom width | Cut to length | No.1 / Pickled | Pressure equipment and structural plates |
| 22–50 mm | Custom width | Custom length | No.1 / Machined | Valve, flange and machined components |
| 55–100 mm | Made to order | Cut plate | Machined / Ground | Heavy machined parts |
| Above 100 mm | Technical review | Project specific | As specified | Special thick plate applications |
Different Specifications Comparison
Plate Surface and Processing Comparison
| Condition | Main Feature | Recommended Use | Purchase Advice |
|---|---|---|---|
| No.1 Plate | Hot rolled, heat treated and pickled | General industrial fabrication | Common for thicker plate |
| 2B Sheet | Smooth cold-rolled finish | Thin sheet and formed parts | Confirm thickness availability |
| Pickled Plate | Scale removed after heat treatment | Welded equipment and process parts | Suitable for further fabrication |
| Polished Plate | Improved surface smoothness | Visible or cleanability-focused parts | State grit or roughness requirement |
| Cut Plate | Custom size and edge preparation | Machined components and fabrication blanks | Confirm cutting tolerance |
Comparison with Related Duplex Grades
| Grade | Main Strength | Relative Limitation | Typical Selection |
|---|---|---|---|
| UNS S32205 / 2205 | Good strength and general duplex performance | Lower PREN than super duplex grades | Moderate chloride service |
| UNS S32750 | High pitting resistance and strength | No intentional W and Cu addition like S32760 | Seawater and aggressive chloride service |
| UNS S32760 | High strength with W and Cu alloying | Higher cost and fabrication control required | Offshore, marine and chemical equipment |
| UNS S32550 | Super duplex corrosion resistance | Different composition and availability | Project-specific duplex plate selection |
Equivalent Standards and International Names
| System | Designation | Relationship |
|---|---|---|
| UNS | S32760 | Primary UNS designation |
| Common Name | Super Duplex F55 | Common trade and project reference |
| EN / W.Nr. | 1.4501 | European material number reference |
| Commercial Name | Zeron 100 type | Commercial alloy family reference |
| Plate Standard | ASTM A240 / ASME SA240 | Plate, sheet and strip specification |
| Forging Reference | ASTM A182 F55 | Related forging grade, not plate standard |
Production Process Flow
Alloying elements are prepared according to S32760 chemistry requirements.
Chemistry, cleanliness and nitrogen control are managed during melting.
Slabs are prepared for hot rolling or further processing.
The slab is rolled into plate or sheet thickness.
Solution annealing is applied when required by specification.
Scale removal, polishing or surface finishing is completed.
Dimensions, surface, PMI and documentation are checked.
Heat-number marking and export packing are prepared.
Product Inspection
| Inspection | Method | Purpose |
|---|---|---|
| Chemical Analysis | Laboratory analysis or MTC review | Confirm UNS S32760 chemistry |
| PMI | Positive material identification | Available when specified; not a substitute for full chemistry |
| Dimensional Inspection | Thickness, width and length measurement | Verify ordered plate size and tolerance |
| Surface Inspection | Visual and finish inspection | Check surface defects and finish quality |
| Mechanical Testing | Tensile and elongation testing | Confirm specified plate properties |
| Hardness Test | HBW or equivalent method | Verify delivery condition |
| Ultrasonic Testing | UT when specified | Evaluate internal soundness for suitable plate thickness |
| Traceability Review | Heat number and label verification | Link product to MTC and EN 10204 3.1 |
Product Packaging
Plates can be protected with waterproof paper, PVC film or protective oil when required.
Separators, foam sheets and edge guards reduce handling damage.
Export pallets, wooden cases or steel frames are selected according to size and weight.
Grade, size, heat number and customer shipping marks can be retained.
Packing list, MTC, EN 10204 3.1 and inspection documents are prepared as required.
Applications, Corrosion Performance and Fabrication
Primary Applications
- Offshore platforms and subsea equipment
- Marine structures and seawater handling equipment
- Pump, valve and pressure equipment components
- Heat exchanger plates and process equipment
- Chemical and petrochemical equipment
- Desalination and chloride-containing process systems
Corrosion Performance
S32760 plate is used where high localized corrosion resistance is required in chloride-containing environments. The addition of chromium, molybdenum, nitrogen, tungsten and copper provides strong resistance to pitting and crevice corrosion compared with standard duplex grades.
Fabrication
S32760 can be cut, formed and machined with suitable tooling and process control. Due to its high strength and duplex structure, forming loads may be higher than austenitic stainless steel, and welding procedures should control heat input and interpass temperature.
Welding
Welding can be performed with qualified procedures and compatible filler metals. The finished weld zone should maintain suitable ferrite-austenite balance and corrosion resistance. Post-weld cleaning, pickling or passivation may be required depending on service conditions.
Heat Treatment
S32760 is normally supplied in solution-annealed condition. It is not selected for precipitation hardening. Improper thermal exposure may cause harmful intermetallic phase precipitation, so heat treatment and hot fabrication should follow the applicable specification and procedure.
Why Choose SAKY STEEL?
Thickness, width, length, surface and cutting requirements can be supplied according to drawings.
Material identification can be maintained from production record to final packing label.
MTC (Mill Test Certificate / 质保书) can be provided according to the purchase order.
EN 10204 3.1 documentation is available when specified.
PMI, dimensional, mechanical, hardness and UT inspection can be arranged when specified.
Pallets, wooden cases, steel frames and customer shipping marks can be arranged.
FAQ
What is UNS S32760 stainless steel plate?
UNS S32760 is a super duplex stainless steel plate grade with high strength and excellent chloride corrosion resistance. It is commonly used in offshore, marine and chemical equipment applications.
What standard applies to S32760 plate?
ASTM A240 and ASME SA240 are commonly used for S32760 plate, sheet and strip. The purchase order should confirm the required standard, thickness, surface, testing and certificate requirements.
Is S32760 the same as F55?
S32760 is widely associated with F55 and EN 1.4501. However, the exact product specification should still be confirmed because plate standards, forging standards and project requirements may differ.
Can S32760 plate be welded?
Yes, S32760 plate can be welded with a qualified welding procedure. Heat input, interpass temperature, filler selection and post-weld cleaning should be controlled to maintain corrosion resistance and phase balance.
What surface finishes are available?
Common finishes include No.1, pickled, 2B and polished surfaces. Final availability depends on thickness, production route and customer requirements.
Is PMI available for S32760 plate?
PMI can be arranged when specified to help verify alloy identity before shipment. It should be used together with MTC review, not as a complete substitute for laboratory chemical analysis.
Can MTC and EN 10204 3.1 be provided?
SAKY STEEL can provide MTC and EN 10204 3.1 documentation according to the purchase order. Additional dimensional, PMI, mechanical or UT reports may also be arranged when specified.
