ASTM A240 UNS S32760 Stainless Steel Hot Rolled Plate Super Duplex Stainless Steel Sheet

UNS S32760 is a super duplex stainless steel plate that offers an exceptional combination of high strength and outstanding corrosion resistance. This grade is designed for service in aggressive environments where conventional stainless steels such as 316L or even standard duplex grades like 2205 are insufficient.

The chemical composition of S32770 is carefully balanced with high levels of chromium, molybdenum, and nitrogen, along with a controlled addition of tungsten and copper. This unique formulation delivers excellent resistance to pitting, crevice corrosion, stress corrosion cracking, and erosion-corrosion in chloride-containing media.

ASTM A240 is the standard specification that covers chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications. UNS S32760 plates produced under this standard are solution annealed and water quenched to restore corrosion resistance and achieve the required mechanical properties.

This super duplex plate is widely specified for offshore platforms, desalination plants, chemical processing equipment, and pulp and paper mills where equipment reliability is critical, and maintenance access is limited.

Key advantages of UNS S32760 plate:

• Biphase microstructure (approximately 50% austenite / 50% ferrite) for high strength and good ductility

• PRE (Pitting Resistance Equivalent) value exceeding 40, suitable for high-chloride environments

• Excellent resistance to hydrogen-induced stress cracking

• Good weldability with proper filler metals and heat input control

• High yield strength – approximately twice that of 316L stainless steel

The chemical composition of UNS S32760 is strictly controlled to achieve the desired phase balance and corrosion resistance.

Note: The addition of tungsten and copper distinguishes S32760 from other super duplex grades such as S32750, providing enhanced corrosion resistance in specific aggressive media.

After proper solution annealing and water quenching, the UNS S32760 plate delivers the following mechanical properties:

Key mechanical advantages:

• Yield strength approximately 2x that of 304 and 316 stainless steels

• Good impact toughness even at sub-zero temperatures

• Ductility suitable for forming and fabrication

UNS S32760 super duplex plate is chosen for demanding applications where corrosion resistance and mechanical strength must work together.

• Oil and gas platform topside equipment

• Seawater cooling systems and firewater lines

• Subsea manifolds and risers

• Desalination plant vessels and piping

• Ballast water treatment systems

The high PRE value (typically >40) ensures resistance to pitting and crevice corrosion in seawater, even in stagnant or low-flow conditions.

• Heat exchangers handling chloride-containing cooling water

• Reactor vessels for organic acids and chlorides

• Evaporators and crystallizers

• FGD (Flue Gas Desulfurization) system components

• Pressure vessels for aggressive chemical service

S32760 resists stress corrosion cracking in chloride environments where 300-series austenitic stainless steels would fail.

• Process vessels on offshore platforms

• Separation and treatment equipment

• High-pressure flowlines and manifolds

• Sour service components (NACE MR0175/ISO 15156 compliant)

• Bleaching plant digesters and washers

• Chlorine dioxide bleaching towers

• White liquor and green liquor tanks

The combination of high strength and corrosion resistance allows for lighter wall thicknesses compared to less corrosion-resistant alloys.

• Condensers in coastal power plants

• Cooling water intake systems

• FGD absorber towers and ductwork

When placing an order for ASTM A240 UNS S32760 plate, please specify:

1. Quantity (pieces or total weight in metric tons)

2. Dimensions (thickness × width × length)

3. Edge Condition (mill edge or slit edge)

4. Surface Finish (No.1, 2B, or other)

5. Certification Requirements (EN 10204 Type 3.1 or 3.2)

6. Third-Party Inspection (SGS, BV, Intertek, or as requested)

7. Supplementary Requirements (ultrasonic testing, ferrite measurement, etc.)

For inquiries, technical data sheets, or a quotation for ASTM A240 UNS S32760 super duplex stainless steel plate, please contact our sales team.

We provide:

• Mill test certificates with full traceability

• Competitive pricing for project quantities

• On-time delivery to global destinations

• Technical support from material selection to fabrication

We respond to all inquiries within 24 hours.