Super Duplex 2507 Stainless Steel Plate Sheet UNS S32750 High Strength Corrosion

Super Duplex 2507 (UNS S32750) sheets represent the highest level of duplex stainless steel technology, offering an exceptional combination of mechanical strength and corrosion resistance. This advanced material is specifically engineered for service in the most demanding environments, including high-chloride seawater, acid chloride media, and sour gas applications.

The designation "Super Duplex" refers to the premium grade of duplex stainless steel with a Pitting Resistance Equivalent Number (PREN) exceeding 40. UNS S32750 achieves this through a carefully balanced chemistry featuring high levels of chromium (24-26%), molybdenum (3-5%), and nitrogen (0.24-0.32%). The result is a material that significantly outperforms standard duplex grades like 2205 and conventional austenitic grades such as 316L.

The chemical composition of Super Duplex 2507 is strictly controlled to achieve the required phase balance and corrosion resistance. Below are the requirements per ASTM A240:

PRE (Pitting Resistance Equivalent) Calculation: PRE = Cr% + 3.3(Mo% + 0.5W%) + 16N%

For UNS S32750, the PRE value typically exceeds 40, indicating excellent resistance to pitting and crevice corrosion in chloride environments.

After proper solution annealing and water quenching, Super Duplex 2507 sheets deliver the following mechanical properties:

Comparison of strength levels:

Super Duplex 2507 sheets are specified for demanding applications across multiple industries where high strength and exceptional corrosion resistance are required.

• Seawater cooling systems and firewater lines

• Offshore platform topside equipment

• Desalination plant evaporators and piping

• Ballast water treatment systems

• Hydraulic and instrumentation systems

• Subsea manifolds and jumpers

The high PREN value (>40) ensures reliable performance in seawater, even in crevice conditions, stagnant flow, or high-velocity applications.

• Heat exchangers handling chloride-containing cooling water

• Chemical tankers and storage vessels

• Evaporators, crystallizers, and reactors

• Flue Gas Desulfurization (FGD) components

• Process piping for organic and inorganic acids

• Bleaching equipment in pulp and paper mills

UNS S32750 resists pitting, crevice corrosion, and stress corrosion cracking, where 316L and even 2205 duplex would experience premature failure.

• Process equipment on offshore platforms and FPSOs

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

• High-pressure flowlines and manifolds

• Separation and treatment vessels

• Subsea Christmas trees and wellhead equipment

• Seawater-cooled condensers and heat exchangers

• Cooling water intake systems

• FGD absorber towers and ductwork

• Geothermal power plant equipment

• Bleaching plant digesters and towers

• Chlorine dioxide bleaching systems

• White liquor and green liquor tanks

• Washers and filters

• High-performance building facades in coastal locations

• Bridge components exposed to de-icing salts

• Marine architectural features and fittings

When placing an order for Super Duplex 2507 (UNS S32750) sheets, please specify the following to ensure accurate quotation and delivery:

1. Quantity – Number of sheets or total weight (metric tons)

2. Dimensions – Thickness × Width × Length (mm or inches)

3. Surface Finish – 2B, 2D, No.1, BA, or custom

4. Edge Condition – Mill edge or slit edge

5. Certification Requirements – EN 10204 Type 3.1 or Type 3.2

6. Third-Party Inspection – SGS, BV, Intertek, or as specified

7. Supplementary Requirements – Ferrite measurement, ultrasonic testing, intergranular corrosion test, etc.

8. Packing Preference – Standard export packing or custom requirement

For inquiries, technical data sheets, material selection assistance, or a quotation for Super Duplex 2507 (UNS S32750) corrosion-resistant high-strength sheets, please contact our sales team.

We provide:

• Mill test certificates with full traceability to heat numbers

• Competitive pricing for project quantities and regular stocking orders

• Reliable delivery to global destinations

• Technical support from material selection through fabrication

All inquiries are responded to within 24 hours.