ˆ $ ˘$ 0˘˙ ˇ/ ˙ ˆ 0˘˙beginning of the tube while the distance between planes of axis of rolling mill stands amounted to 360 mm Average wall thickness in this place is about twice bigger than the wall thickness of mother tube The case of rolling the thickened end according to Figure 2 shows the importance of inter stand tension in stretch reduction of tubes