Super Duplex stainless steels (UNS S32750/S32760) offer even higher chromium, molybdenum, and nitrogen contents than standard Duplex. This results in exceptional Pitting Resistance Equivalent Numbers (PREN > 40).
These fasteners are critical for subsea equipment, aggressive chemical processing, and applications where standard materials would fail rapidly.
Frequently Asked Questions
What is a PREN number?
PREN stands for Pitting Resistance Equivalent Number. A higher PREN indicates better resistance to localized pitting corrosion. Super Duplex has a PREN > 40, making it extremely resistant to saltwater and chlorides.