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Does API require plate or welds to be PT tested?

Section VIII Division 1 box header pressure vessel

do 100% RT box headers require a RT1 stamp on the code tags?

CAN A BOX HEADER HAVE TWO NB CODE STAMPED TAGS ON IT? IF SO, WOULD EACH TAG BE ALLOWED A SEPARATE NB NUMBER OR WOULD THE SAME NUMBER BE APPLIED TO EACH TAG? THANKS , RADD02

Are these two alloys interchangeable, or is there an annealing process that makes interchange impossible?

If weld thickness sets the heating / cooling rate? what if this heating / cooling rate is exceeded?

What are the cooling tolerances for the rate-of-cooling for SA-516-70 plate 1.5 inch plate welded to 5/8 inch plate. this is a box header. If spec calls for cooling no more that 500deg / hour, what if the rate is 600deg / hour? Thanks, RA

A job requirement lists normalized material. I have an MTR that lists this flange as heat treated (normalized). But the mtr copy lists the part as SA-105, not SA-105N. Does the flange itself need the "N" stamp on it for verification?