1. material: steel/stainless steel 2. process: forge,cast 3.size:1/2''-100' 4.standard: DIN, BS, USS, JIS 5.ISO certified TypesSlip-On, Welding Neck flange, Blind flange, Socket Welding flange, Threaded flange, Lap Joint flange and Plate flange, Orifice flange, Ring joint flange, Screwed Boss Flange, etc. Applicable standard GB, ASME , ANSI, MSS ,JIS , DIN , EN, BS, and customers' drawings for ...