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From the drawing I would assume the marked surface as being the area of interest. However as a UT tech I would need a lot more information (equipment requirements, probe angle, ect...) which may be contained in the DIN spec stated at the bottom (this also very likely contains your acceptance...

You should refer to SA-516-70 of ASME Section II-A. This will define what is required on the MTR to conform to the material specification.

Just a guess but I believe it is referring to proportional limit. I base this assumption off of Sect II D Appendix 3

Closest I can think of is UG-43 (d), though I am not positive it would be considered a studded connection. You may also reference the standard the flange is made to (B16.5), and make sure the flange is still acceptable to use under its rating...