The next step is to calibrate or reduce the cross-section. Then the deposit is removed, i.e. the undesirable layer that appears on the heated surface. The residue of carbon deposit may cause a defect in the final product. Its presence causes not only a number of defects on the inner and outer surfaces of the pipes. It also influences faster tool wear, forces frequent tooling changes, roll grinding, etc. The semi-finished product prepared in this way goes to a hydraulic punching press, in which a thick-walled sleeve with a bottom is formed from a square-section billet. After the billet is introduced into the die and the press is started, the sleeve is extruded with a punch. Another important stage is rolling on a rolling mill with oblique rolls (elongator). In this way, an elongated sleeve is obtained, which is then fed to the pusher bench. The reheated blank is stretched to its final diameter and wall thickness.

After final rolling, the ends of the pipes are cut. Then the pipes are cooled, straightened, divided into the required lengths and marked. Quality control is carried out at every stage of production. Various types of tests are performed – from mandatory, through optional, to tests conducted according to special customer requirements.