Abstract: The present invention relates to plastic working of metals and the reducing of a workpiece along its axis by a pair of shaped rolls with formation in the workpiece of a transitional length whose cross section gradually changes from a starting one to several cross sections of finished bars interconnected by webs. The reduction of the workpiece is alternated with its axial displacement through one feed step, whereas at the end of a transitional length adjacent bars are displaced one with respect to another in opposite directions perpendicularly to webs so as to separate the bars. Mill rolls used with the method have several grooves of a variable cross section which form passes for rolling bars. The profile of each groove in transversal (with respect to mill roll axis of rotation) cross section is formed of two mutually conjugated arcs successively coming into contact with the workpiece. The grooves have an arc for reducing the workpiece and an arc for dividing bars one from another.