... :1/2"~60" 2.standard: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, ring joint flangeSize1 ... /25/45/60 days according to quantity PortTianjin seaport,China. dn80 carbon steel weld neck flange