In order to improve dimensional tolerances, surface quality and forming characteristics, the tubes are cold drawn, There are two different type of hollows used in this process: welded or seamless,

Welded hollows for cold drawing are carefully produced and checked with on-line NOT test and off-line DT (i,e, flattening, expanding) whereas seamless hollows are obtained exclusively from major seamless hollow suppliers,

Following to annealing and necessary surface treatment operations, cold drawing process is realized on hollows, In order to meet technical requirements this cycle may be repeated several times and if necessary the tubes are reprocessed by a final heat treatment,

The cold drawn tubes by Kalibre Boru assure more precise tolerances, excellent surface quality, controlled hardness and ultimate strength values,

This process is followed by fully integrated equipment which delivers the tube to the packaging, Tubes are packaged in hexagonal bundles after coated with rust preventive oil, On request tubes can be put in wooden boxes, covered with anti corrosive paper or plastic,