The paper deals with the quality issues of OCTG with upset ends produced on SMS Meer hydraulic presses. It focuses on the causes of defects appearing on the inner surface of products in the form of underfilled pass near the pipe end. The results of computer simulation of upsetting have established dependence of defects formation on technological factors, including original workpiece sizes. The industrial experiment results have confirmed the key points of the computer simulation and allowed formulation of requirements to a workpiece and tool calibration which eliminate defects formation on the inner surface of pipes. The results of this work have made it possible to intensify the pipe end upsetting process in a single pass with an increase in a wall-thickening ratio up to 1.85.