Do the paragraphs 22.2.2.3 & 22.2.2.4 (read together) of SA-370 (ASME II sect. A) mean that the minimum thickness from which you can obtain a sub-size specimen for impact test is 3.5mm?

If it's so, why SA-333/SA-334 mention 3mm as the minimum thickness for impact requiremnts taken in consideration?

even 10 X 2.5 (not 3.5mm) is allowed by SA370.
However it is the product specification which is to be followed. 3mm is considered in SA333 because after machining we should obtain 2.5mm atleast.

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Raghuram