... Tube 1.Standard:ASTM,GB,etc 2.Process:Centrifugal Casting 3.ISO 9001:2008 Certificate Heat Exchange Finned Tube 1.Bare tube ... size: OD25mm-OD160mm 2.Fins Pitch: 4mm-30mm 3 ... , all types of lathe.7.Surface finish processpolishing, sand blasting, heat treatment, painting, powder coating, anodizing, electroplating, mirror polishing.8 ...