TY - JOUR N2 - The study proposed the model of “guide mark” defects formation on the internal surface of pipes, produced on PRM mills of PRP – 140. The research of pipe forming at plug rolling mill with stub mandrel has been carried out; regularities of the dimensionless parameters characterizing the deformation of the gap release, depending on the reduction ratio, were determined. The model of “guide mark” defect formation on the internal surface of the pipe has been proposed. This allows for lesser wall thickness variation of rough tubes. It has been shown that, when using dioctahedral pass designs in comparison with hexagonal pass designs the proportion of displaced volume along the pipe axis is greater but the value is lower; thereby, the risk of “guide mark” defect forming is reduced. L1 - http://www.journals.pan.pl/Content/107982/AMM-2018-3-02-Dyja.pdf L2 - http://www.journals.pan.pl/Content/107982 PY - 2018 IS - No 3 EP - 1086 DO - 10.24425/123779 KW - plug rolling mill KW - plugging with stub mandrel KW - forming KW - guide mark defect KW - finite element simulation FEM A1 - Pavlov, D. A1 - Bogatov, A. A1 - Pavlova, E. A1 - Dyja, H. PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 63 DA - 2018.10.10 T1 - Investigation of Plug Rolling with Stub Mandrel Using the Finite Element Method SP - 1083 UR - http://www.journals.pan.pl/dlibra/publication/edition/107982 T2 - Archives of Metallurgy and Materials ER -