Understanding NORSOK Material Data Sheets for Offshore Piping
The NORSOK standard, developed by the Norwegian petroleum industry, sets some of the world's most stringent requirements for materials used in offshore oil & gas applications. For duplex and super duplex seamless pipes, two key material data sheets apply:
NORSOK MDS D45 — Duplex 2205
Covers Duplex 2205 (UNS S32205) seamless pipes for topside and non-critical subsea applications. Key requirements beyond standard ASTM A790:
- Impact testing at -46°C (Charpy V-notch, 45J minimum average)
- Ferrite content 35-65% (ASTM E562)
- Corrosion testing per ASTM G48 Method A at 22°C minimum
- Hardness max 28 HRC (body) and 32 HRC (weld zone)
- Solution annealing at 1020-1100°C with water quench
NORSOK MDS D56 — Super Duplex 2507/S32760
Covers Super Duplex 2507 (UNS S32750) and S32760 for critical subsea and high-integrity applications. Additional requirements:
- Impact testing at -46°C (45J minimum average)
- ASTM G48 Method A corrosion testing at 40°C minimum (50°C for critical service)
- Micro examination for detrimental intermetallic phases (sigma, chi)
- Enhanced surface finish and marking requirements
Stancor's NORSOK Manufacturing Capability
Stancor's manufacturing process is designed to consistently meet NORSOK requirements. Our quality control includes:
- Automated solution annealing furnaces with precise temperature control (±5°C)
- In-line ferrite measurement using Fischer Feritscope
- In-house Charpy impact testing at -46°C and -80°C
- Corrosion testing laboratory (ASTM G48 Method A, ASTM A923 Method C)
- Full 100% radiographic or ultrasonic examination
European Offshore Markets We Serve
- Norway: Equinor (formerly Statoil), Aker BP, and Wintershall Dea projects on the Norwegian Continental Shelf
- United Kingdom: Shell, BP, and TotalEnergies North Sea operations
- Netherlands: NAM and offshore wind foundation structures
- Denmark/Finland: Emerging offshore wind and subsea infrastructure
Request a NORSOK-compliant quotation — include your MDS reference and we'll provide a detailed compliance matrix with our offer.