... ,GB 2.Material:Cr25Ni35,HK40,steel 3.ISO9001:2008 Weld Neck Slip on Lap Joint Flange Varieties: threaded flange, slip ... 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 ...