UNE-EN 10225-1:2020

This part of EN 10225 specifies requirements for weldable structural steels to be used in the fabrication of fixed offshore structures in the form of plates.

Following thickness limitations are given in this standard:

S355NL1O up to and including 200 mm;

S355ML1O, S420ML1O, S460ML1O, S500ML1O up to and including 120 mm;

S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO up to and including 150 mm.

Greater thicknesses may be agreed, provided the technical requirements of this European Standard are maintained.

The standard is applicable to steels for offshore structures, designed to operate in the offshore sector but not to steels supplied for the fabrication of subsea pipelines, risers, process equipment, process piping and other utilities. It is primarily applicable to the North Sea Sector, but may also be applicable in other areas provided that due consideration is given to local conditions e.g. temperature.

NOTE There is an Annex F on the prequalification of steels for fixed offshore structures in arctic areas.

Minimum yield strengths up to 690 MPa are specified together with low temperature impact properties at temperatures down to 40 °C.