A process for the production of hot-worked seamless pipes with improved fatigue properties in the welded state

The invention relates to a process for the production of hot-rolled, in particular hot-rolled seamless pipes with improved fatigue properties in the welded state with an outside diameter to 711 mm and a nominal wall thickness up to 100 mm of metal, particularly steel, wherein after the hot or finish rolling at least at one tube end provided with a close tolerance for the inner and outer diameter defined tube cross-section is generated by a fixed length, which then allows a welding to the pipe end of a further tube. For this purpose, it is provided that in a first step on the relevant pipe end in a region a greater wall thickness is produced as the other pipe body wherein the outer diameter is increased and / or the inner diameter is reduced, and in a second step in this area by machining the required tube cross-section made and the transition from processed to unprocessed region of the tube with low surface roughness and virtually free of notches produced is fluent and the remaining in the processing region residual wall thickness is within the required tolerances.