UNS S32750 Super Duplex Stainless Steel

UNS S32750 Super Duplex Stainless Steel, also known as SAF 2507, is an advanced stainless steel alloy that offers exceptional corrosion resistance, high strength, and excellent mechanical properties. It belongs to the group of duplex stainless steels and is designed to provide even higher resistance to corrosive environments compared to standard duplex grades.

Key Features

  • Corrosion Resistance: UNS S32750 exhibits superior corrosion resistance in aggressive environments, including those containing chlorides, acids, and seawater. This makes it highly suitable for applications in offshore and marine industries, chemical processing, and more. 
  • Pitting and Crevice Corrosion Resistance: The alloy’s composition, which includes higher levels of chromium, molybdenum, and nitrogen, provides exceptional resistance against pitting, crevice corrosion, and other localized forms of corrosion. 
  • Strength: Super duplex stainless steels like UNS S32750 offer significantly higher strength compared to both standard duplex and austenitic stainless steels, making them suitable for heavy-duty applications. 
  • Fatigue and Toughness: The combination of high strength and good fatigue and toughness properties makes UNS S32750 suitable for applications exposed to cyclic loads and impacts. 
  • Applications: Due to its outstanding corrosion resistance and mechanical properties, UNS S32750 is commonly used in demanding applications such as oil and gas exploration and production, chemical and petrochemical processing, desalination plants, and more. 
  • Weldability: While super duplex stainless steels can be more challenging to weld than standard stainless steels, UNS S32750 offers acceptable weldability when proper welding procedures are followed.


  • Welding Challenges: Like other duplex and super duplex stainless steels, UNS S32750 can be susceptible to certain welding-related issues, including phase balance and susceptibility to solidification cracking.
  • Cost: Super duplex stainless steels are typically more expensive than standard duplex and austenitic stainless steels due to their specialized properties.

UNS S32750 super duplex stainless steel is a highly advanced material designed for applications requiring exceptional corrosion resistance, high strength, and toughness. Its unique combination of properties makes it well-suited for demanding environments where standard stainless steels might not provide sufficient performance.