Flat Flange Compared with the flange with neck, the plate flange can be divided into carbon steel plate flange, stainless steel plate flange and alloy steel plate flange according to the material. The structural form of flange includes integral flange and unit flange. Flat flange produced by hengdaxin pipe fittings Standard system for Nimonic 90 Other Flat Flanges materialTin bronze, Alumunum bronze, Lead bronzeFlat Flange website:http://www.sy-exports.com/flat-flange/