NORSOK M-001 material requirements: where it fits in steel procurement
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Where NORSOK M-001 sits in the specification hierarchy and why it should not be treated as a steel grade or stand-alone product standard.
NORSOK M-001 is a materials-selection standard, not a steel grade and not a dimensional/product standard for plate, pipe or sections.
That distinction is essential in procurement. An RFQ saying only “material shall comply with NORSOK M-001” is normally incomplete; the actual product still needs its governing material/product specification, grade and project requirements.
What does NORSOK M-001 cover?
The current edition is NORSOK M-001:2025, Materials selection. Public catalogue information states that it concerns hydrocarbon production and processing facilities and supporting systems for fixed offshore installations, including subsea production systems. It also applies to onshore terminals except structural and civil works.
Its scope includes:
- material selection and corrosion evaluation;
- corrosion protection/control;
- design limitations for specific materials;
- qualification requirements for new materials or new applications.
The Norwegian offshore regulator's guidance also points to NORSOK M-001 for material selection.
Where does it sit in a steel purchase?
A typical hierarchy may look like:
Project / operator specification
↓
NORSOK M-001 material-selection requirements
↓
Product standard and grade such as EN 10225, EN 10025, API 5L, ASTM/ASME, etc.
↓
Additional testing, certification and fabrication requirements
The exact hierarchy is project-specific, but the principle is that M-001 normally supplements the product standard rather than replacing it.
Why this matters commercially
If a buyer asks whether an S355 plate or API 5L pipe is “NORSOK compliant,” the answer cannot come from the grade name alone.
Compliance can depend on:
- service environment;
- corrosion allowance/protection strategy;
- temperature;
- sour-service conditions;
- material family;
- fabrication and welding;
- project-specific restrictions;
- qualification requirements.
M-001 and sour service
NORSOK material-selection requirements may interact with sour-service standards such as NACE MR0175 / ISO 15156. They are not the same document and should not be merged conceptually.
See NACE MR0175 / ISO 15156 applicability for metallic materials.
Edition control matters
The 2014 edition and its 2021 amendment/corrigendum have been replaced by NORSOK M-001:2025. Historical project specifications may still explicitly invoke an earlier edition.
Always follow the edition named in the contract unless the purchaser formally approves a change.
Procurement takeaway
Do not write “NORSOK M-001 grade.” Instead, identify the actual product standard and material grade, then list the NORSOK/project requirements that apply to the service. This avoids confusing a materials-selection framework with the product specification used to manufacture and certify the steel.
References and verification sources
Standards referenced
- NORSOK M-001:2025
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