ANSI WELDING NECK FLANGE 1-standards:ASTM,BN API,etc 2- ... Features:1>Types: welding neck, slip-on, threaded, lap-joint, socket welding and blind2>Manufacturing standards: API, ANSI, BS, JIS, UNI ... (DN 15 to DN 1,400mm)4>Pressure: from ANSI class 150 to 2,5005>Materials: A105, LF2, ... elbow, tri -elbow, different-diameter pipe, bebded pipe, flange, etc. The main products have been awarded by provicne ...