... ANSI,BS,ASME,GB,GOST dn80 carbon steel weld neck flange Types of flangeweld neck flange, slip on flange, plate flange, blind flange, socket weld flange, threaded flange, lap joint flange ... 600, 900, 1500, 2500 ClassStandardASTM A234 WPB,ANSI B16.5,DIN,BS,GOST,GB Surface treatmentblack painting, ... than 15/25/45/60 days according to quantity PortTianjin seaport,China. dn80 carbon steel weld neck flange