carbon steel flange ,steel flange, pipe flange, forged flange, casting flange,slip-on flange carbon steel flange Material: carbon steel pipe Technics: ForgedPlace of original: Hebei China ... ,BSMaterial:Carbon steel,Alloy steel , Stainless steelType:Blind flange, slip-on flange,welding neck flange,thread flange, socket welding flange,,,,,,QuliticationISO, CE, APISurface treatment:Black paint, yellow ...