... ,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 ... ,xs,xxsMaterialcarbon steel,stainless steel, alloy steel.Techniquecasting or forgedPressure Rating150, 300, 600, 900, 1500, 2500 ClassStandardASTM A234 WPB,ANSI B16.5,DIN,BS ...