Super Duplex Steel
Super Duplex Stainless Steel is a high-alloy member of the Duplex family, designed to deliver enhanced strength and corrosion resistance beyond that of standard Duplex grades.
The “super” designation refers to its higher chromium, molybdenum and nitrogen content, which significantly improves corrosion performance.
This makes Super Duplex Stainless Steels the material of choice for severe service conditions found in the offshore, marine, chemical processing and oil & gas industries.
Super Duplex Steel
Super Duplex Stainless Steel is a type of corrosion-resistant alloy that is highly resistant to chloride-induced stress corrosion cracking and pitting. It is often used as a substitute for 300 series Stainless Steel, high nickel super-austenitic steels and nickel-based alloys.
Its dual-phase austenitic–ferritic microstructure provides a unique combination of properties: very high yield strength, excellent toughness, and superior resistance to pitting, crevice corrosion and stress corrosion cracking, especially in chloride-rich or acidic environments.
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UNS 32750 - 1.4410
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UNS 32760 - 1.4501
Super Duplex Applications
The superior properties of Super Duplex sheet and plate make it highly suitable for critical and aggressive environments across a wide range of industries. Common applications include offshore platforms, subsea pipelines, heat exchangers, pressure vessels, chemical and petrochemical processing equipment, desalination plants, and marine structures.
Due to its exceptional mechanical strength, Super Duplex allows for thinner wall sections and reduced overall weight while maintaining structural integrity and corrosion performance. This not only reduces fabrication and installation costs but also delivers excellent lifecycle value.
Why Super Duplex
While austenitic grades such as 304L or 316L may be suitable for general corrosion resistance, they cannot match the strength or chloride stress corrosion cracking resistance of Super Duplex. The enhanced alloy composition of UNS S32750 / 1.4410 and UNS S32760 / 1.4501 provides the best possible balance of performance, durability and cost for the most demanding applications.
Compared with standard Duplex (1.4462) or Lean Duplex grades, Super Duplex offers superior corrosion resistance, higher mechanical strength, and outstanding resistance to pitting and crevice corrosion in chloride-containing environments such as seawater, brine and chemical process systems.
When strength, corrosion resistance and reliability are critical, Super Duplex Stainless Steel from Steel Dynamics UK delivers premium quality and long-term performance that you can depend on.
We supply only Super Duplex stainless steel sheet and plate from Europe’s most trusted mills, ensuring full material traceability, consistent mechanical properties and certified compliance with international standards.
