Abstract: In the manufacture of seamless steel tube by hot-rolling a tube blank on a mandrel in a continuous rolling mill, the tube is withdrawn from the mandrel and reduced by reducing roll stands downstream of and in alignment with the rolling mill which operate on the part of the tube withdrawn from the mandrel. The mandrel is advanced through the rolling mill at a controlled speed and is not released until the reduction of the tube has been completed. The reducing roll stands are then opened and the released mandrel follows the tube through the stands but without contacting the rolls.

Abstract: Apparatus for the radiographic inspection of tubes comprises a chamber coining a radiation emitter, a carriage for positioning a selected section of the tube opposite the emitter, a movable member for positioning a film inside the tube opposite the emitter, and a remote control system for operating the emitter, carriage, and movable member from outside the chamber. Method of making a film of a selected area of said tube with said apparatus.