What is super duplex stainless steel?
Super Duplex Stainless Steel is a high-performance alloy that offers an excellent combination of strength, corrosion resistance, and durability. It is widely used in industries such as oil and gas, chemical processing, marine engineering, and desalination plants, where materials are exposed to extreme environments.
ASME B36.10 super duplex ASTM A790 PE seamless pipes
Key Characteristics of Super Duplex Stainless Steel
1.Dual-Phase Microstructure:
Super duplex stainless steel consists of approximately 50% austenite and 50% ferrite, providing enhanced mechanical strength and superior resistance to stress corrosion cracking (SCC) compared to conventional stainless steels.
2.High Strength & Toughness:
With nearly twice the yield strength of standard austenitic stainless steels like 304 and 316, super duplex stainless steel allows for thinner and lighter constructions without compromising durability.
3.Superior Corrosion Resistance:
One of the standout features of super duplex stainless steel is its exceptional resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. The Pitting Resistance Equivalent Number (PREN) of super duplex grades often exceeds 40, making them ideal for aggressive chloride environments such as seawater and offshore applications.
4.Excellent Weldability:
Despite its high strength, super duplex stainless steel can be effectively welded with proper precautions, ensuring minimal loss of corrosion resistance and mechanical properties.
WN FLANGE RTJ 10000 PSI API 6A TYPE 6BX SUPER DUPLEX SS ASTM A182 GR
5.Good Resistance to Fatigue & Erosion:
This material performs exceptionally well in high-pressure and high-temperature conditions, making it a preferred choice for heat exchangers, pressure vessels, and pipelines.
Common Grades of Super Duplex Stainless Steel
Some widely used super duplex stainless steel grades include:
UNS S32750 (SAF 2507) – Known for its outstanding pitting resistance and mechanical properties.
UNS S32750 – Enhanced with copper and tungsten, offering improved weldability and corrosion resistance in extreme environments.
Applications of Super Duplex Stainless Steel
Due to its exceptional properties, super duplex stainless steel is commonly used in:
Oil & Gas Industry: Pipelines, heat exchangers, pressure vessels.
Marine & Offshore Engineering: Shipbuilding, seawater desalination, subsea equipment.
Chemical Processing: Tanks, reactors, and processing equipment. Power Generation: Heat recovery steam generators (HRSG) and condensers.
Super duplex stainless steel is a superior choice for demanding applications that require high strength, excellent corrosion resistance, and durability. As industries continue to evolve and demand more efficient and long-lasting materials, super duplex stainless steel remains a top-performing solution for critical engineering projects. Email:sales@haihaogroup.com