... 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/ ... oil industry,chemical industry, water conservancy,electric power, sanitary construction etc.CertificationISO9001:2008;ISO14001 Min order quantity1 ton or according ...