Ah...did not realize that you were asking about Section I material markings. My apologies - at least anyone interested in Section VIII Div. I requirements knows where to find them now. :)
UG-77(a), UG-93(a)(2), and UG-94 (just a few that I found) explicitly state that material markings required by the applicable Section II material specification must be transferred to each new piece, both for traceability and to satisfy the Inspector.
If the material specification does not...
BigTank,
UG-53(d), (e), and (f) allow for the calculation of circumferential efficiencies. You would calculate them the same way you calculate diagonal ligaments, using 90 degrees as your "angle with longitudinal". Depending on your specific setup you may need to use either Figure UG-53.5 or...