I am developing an API 510 package for a client who wants to modify a 1966 vessel fabricated from A-212-B Firebox Steel. Thicknesses run from 0.875" (reinforcing pad) to 1.625" (shell thickness. This vessel will require an MDMT of 30 degrees F. I have heard from various experienced engineers that say that the Firebox variety of the old A-212-B is essentially SA-516-70. However, the ASTM website goes into no detail, and says only that A-212 has been replaced by SA-515. This is an old vessel, and all that remains of documentation is the drawing itself. If the material being used is truly equivalent to A515, then we run the risk of fractures due to lower temperatures. If it is truly equivalent to A516, I need documentation of that fact, not just the "say-so" of an "expert". In addition, at least some thicknesses of A212 were normalized, and I could really use finding out if the above listed thicknesses were included in those thicknesses.
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