... , UNI, AS21293) Type: Plate, Slip-on, Welding Neck. Thread, Socket Weld, Blind Flanges4) Material: A105, SS400, SF440, RST37.2, S235, C22 ... . about usskyhorse Industry Co., LtdWith the rich experience of exporting flanges, we have many flange supply factories which are keep cooperate ...