The materials for flanges are basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe. Each flange ASME B16.5 has a number of standard dimensions. If a draftsman in Japan or a work preparer in Canada or a pipefitter in Australia is speaking about a Welding Neck flange NPS 6, Class 150, Schedule 40 ASME B16.5. In order to enquire correctly, please contact SMGI’s sales team!