Tube for heat exchanger and process for making same

The invention relates to a metal heat exchanging tube, which is in suitable for the pipe external surface of the evaporation the hydraulic the full material or the adjusting, composed of a rib according to the outer surface of the integrally formed (3), and a gap of the primary groove (4) is tank (6) is device of the ribs (3) extends. In turn to improve the evaporation power, suggested of the secondary groove shape, which two sides of the crevices. The mechanical stability of pipe joint therefore the internal part of the negative force, because of the ribs, and connected with the additional external side ribs (5) with the material extrudes tank bottom (6), generating is a closed cavity hole, a secondary channel of cutting and cavity producing 3-cyanopyridine hope (7).