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Super Duplex Stainless Steel Pipes & Tubes

Ultimate corrosion resistance for extreme environments — Engineered with a PREN > 40 for superior performance in high-chloride and acidic media.

High-Alloy Super Duplex Solutions

Super Duplex Stainless Steel (UNS S32750 and S32760) represents the pinnacle of dual-phase steel technology. These high-alloy grades are specifically designed for service in extremely aggressive corrosive environments. With a Pitting Resistance Equivalent Number (PREN) of over 40, Super Duplex pipes provide unmatched resistance to pitting and crevice corrosion in hot seawater and aggressive acidic media.

Steel Emporium stocks premium Super Duplex 2507 and Zeron 100 pipes that offer exceptional mechanical strength—nearly three times that of standard 300-series stainless steels. This high strength allows for significant wall thickness reduction, making it a highly efficient choice for subsea risers, desalination high-pressure piping, and complex chemical reactors.

Super Duplex Stock
Super Duplex Pipe Production

Technical Advantages of Super Duplex

Maximum Pitting Resistance

With Mo, Cr, and N levels optimized, it provides total immunity to localized corrosion in warm saline environments.

Extreme Tensile Strength

Offers tensile strength up to 800 MPa, allowing piping systems to handle immense internal pressures with ease.

Enhanced Acid Stability

The S32760 variant includes Tungsten and Copper for even better resistance to strong mineral acids (H2SO4, HCl).

Marine & Offshore Reliability

Specifically designed to prevent stress corrosion cracking (SCC) in splash zones and subsea conditions.

Super Duplex Grade Range

Super Duplex 2507 (UNS S32750)

The most common super duplex grade. Excellent for heat exchangers using seawater, subsea control lines, and flue gas desulfurization plants.

Technical Specifications
Super Duplex S32760 (Zeron 100)

A highly alloyed grade with Tungsten and Copper. Best suited for extreme chemical processing and highly aggressive sour gas production.

Technical Specifications
Super Duplex Master Specification Table
Specification Seamless Pipe Range Welded Pipe Range Schedules ASTM Standard
S32750 / S32760 1/2" to 12" NB Up to 36" NB SCH 10S, 40S, 80S, XXS ASTM A790 / A815

Frequently Asked Questions

A duplex grade is defined as "Super" when its PREN (Pitting Resistance Equivalent Number) value exceeds 40. This is achieved by having 25% Chromium and high levels of Molybdenum and Nitrogen.

Yes, especially the S32760 grade, which contains Copper and Tungsten. It offers excellent resistance to mineral acids like hydrochloric and sulfuric acid in various concentrations.

Yes, Super Duplex stainless steels are magnetic because their microstructure is a 50/50 balance of Austenite (non-magnetic) and Ferrite (magnetic).

Service temperature is typically capped at 300°C (572°F). Continuous exposure above this temperature leads to "475°C embrittlement," causing a loss of toughness.

Super Duplex 2507 has higher Chromium (25% vs 22%) and Molybdenum (4% vs 3%), making it more resistant to pitting and providing higher mechanical strength than 2205.

Ready to Order Premium Super Duplex Pipes?

Contact us today for bulk project pricing, custom schedules, and complete material certification (MTC 3.1).

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