... ,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, ... :appearance of smooth,can work under presure for long time,advanced testing equipment to ensure thye quality, ... industries. 13.Payment:L/C,T/T Weld Neck Flange