BUMAX Super Duplex (SDX) NORSOK is a super duplex grade with excellent mechanical properties, and exceptional resistance to general crevice, pitting and stress corrosion in aggressive environments.

Super duplex fasteners for aggressive environments

Due to their high levels of chromium and molybdenum, super duplex grades provide even greater corrosion resistance than duplex grades.

Typical applications for BUMAX SDX NORSOK include heat exchangers in refineries, injection and ballast water systems, petrochemical industries, offshore platforms and power industries.


UNS S32760: EN 1.4501

UNS S32750: EN 1.4410

NORSOK accredited

BUMAX SDX NORSOK are accredited according to NORSOK M-650, NORSOK M-630 MDS D60 and listed as an approved manufacturer on STATOIL TR2000. BUMAX SDX Norsok can be offered in Super Duplex grades UNS S32750 and UNS S32760 for all types of fastener up to 1½”.

BUMAX SDX Norsok fasteners are produced in Sweden, tested and individually marked with full traceability in accordance with NORSOK M-630 MDS D60 and STATOIL TR2000 VN605.


  • Excellent resistance– to general corrosion, pitting and crevice corrosion and chloride induced Stress Corrosion Cracking.
  • Lower thermal expansion coefficient– compared to austenitic stainless steels.
  • High strength – up to strength class 12.9.
  • Excellent ductility.
  • Excellent fatigue properties.
  • All our products offer full traceability with 3.1 certificate on demand.


Contact us to find out more about BUMAX SDX NORSOK, and how this grade can benefit your operations.

BUMAX is available worldwide

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