... ,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 ... ' request4.:Techniques:forged,castedConnect style:welding6.Quality:appearance of smooth,can work under presure for long time,advanced testing equipment ...