Weld Neck Flange 1.Standard:ANSI ASME,DIN,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, ...