Super Duplex Stainless Steels and Duplex Stainless Steels primarily differ in their chromium content, which influences their corrosion resistance. Duplex Stainless Steels typically contain around 22% chromium, while Super Duplex Stainless Steels are alloyed with approximately 25% chromium. The higher chromium content in Super Duplex Stainless Steels significantly improves their resistance to pitting corrosion, offering enhanced protection in aggressive environments. [1] As a result, Super Duplex Stainless Steels provide superior corrosion resistance compared to Duplex Stainless Steels, making them ideal for applications where high performance in challenging conditions is required. [2]

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Source:
[1] https://www.langleyalloys.com/knowledge-advice/difference-duplex-super-duplex-stainless-steels/#:~:text=Super%20Duplex%20stainless%20steels%20are,are%20other%20variables%20than%20these.
[2] https://www.oshwin.com/blog/difference-between-duplex-and-super-duplex.html