... :Cr25Ni35,HK40,steel 3.ISO9001:2008 Weld Neck Slip on Lap Joint Flange Varieties: threaded flange, slip-on flange (SO), ... socket welding flange, lap joint flange (LJF), welding neck flange (WNF), blind flange, orifice ... .Quality:appearance of smooth,can work under presure for long time,advanced testing equipment to ensure thye quality,7.Packing:wooden ...