Flat Welding Flange ANSI B16.5/B16.47 Flange, DIN Standard Flange, ... 3.1 Certificate. Medium:W.O.G China Flat Welding Flangeslip-on welding flangeMaterials, Grades (stainless steel) include:1.4301 SS, 1 ... , SW), JIS 30K Weld Neck Flange4. BS 10 Table D/E/F/H Flange, BS 4504 Flange5. DIN EN 1092-1 ... Surface: FF, RF, LJ, TG, FM, and RTJ China Flat Welding Flange