B16.5, Section 5.1 states "Materials required for flanges and flanged fittings are listed in Table 1A with the restriction that plate materials shall be used only for blind flanges and reducing flanges without hubs."
I have a related question to ask The Forum. If this was a custom flange (not B16.5), then couldn't the flange be built from a larger selection of materials per ASME Section VIII and section II, as opposed to the limited listing in B16.5??? For example, the flange could be fabricated from various metal plate, forged parts, or bar?? It seems like a double standard. Am I correct in my thinking that this justified by the fact that ASME VIII requires the custom design of flanges/nozzles be analyzed for stresses?