... ,GB 2.Material:Cr25Ni35,HK40,steel 3.ISO9001:2008 Weld Neck FlangeVarieties: threaded flange, slip-on flange (SO), socket ... welding flange, lap joint flange (LJF), welding neck flange (WNF), blind flange, orifice flange, reducing flange, pad ... type flange, loose hubbed flange, welding plate flange, welding neck collar, welding-on collar, loose plate flange, companion flange and ...