Cold Drawn Seamless PipeCold Drawn Seamless Pipe used for manufacturing heat exchangers are usually COLD DRAWN, have low carbon content, highly malleable, suitable for bending and coiling. The tubes are annealed after drawing, straightened and undergo a pickling process that gives it an excellent blemish-free finish. Finally they are tested chemically, physically and for hydraulic pressure and other non-destructive tests such as Eddy Current Test, etc. and suitably packed in wooden boxes before shipment.