Impact test for primary structure material

Below material specification uses fabrication offshore container.
As per approved design, in there no mention plate with wall thickness < 6mm.

Do we use plate WT 5 mm material grade S355JR?

See 7.3.2.1 EN 10025-1: Impact test shall not be required for nominal thickness < 6 mm, and
Note a) table 9 of EN 10025-2.

Offer S355J0 to meet Charpy @10 C

If we change grade S355JR (+20 Deg C) to S355J0 (+0 Deg. C), It will comply with design material.

Design material are selected of WT 6 mm and above, so you may check again in drawing if any thickness less than 6 mm, where to assign as primary and secondary structure.

In my opinion:
Primary structure shall min. 6 mm and above,
Secondary structure may be designed less than 6 mm (optional).

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