... and manufactures all kinds of finned tubes. 1, finned tube function: heat transfer;2, the fin-tube type: DR (extrusion type), L ... steel, copper, copper alloy, titanium and so on. 2, fin: aluminum (extruded type or wound type), steel (wound type, high frequency welding ... tube size: 1, base tube: OD16, OD19, OD1 ", OD38; 2, fin: OD34, OD44, OD57, OD70 (or by request).