Journals →  Chernye Metally →  2017 →  #3 →  Back

Tubemaking — RosNITI Achievements
ArticleName Improvement of the technology for hollow shell longitudinal rolling in continuous rolling mills
ArticleAuthor E. A. Shkuratov, A. V. Vydrin

All-Russian Scientifi c and Research Institute of Tube Industry - RosNITI (Chelyabinsk, Russia):

Vydrin A. V., Dr. Eng., Prof., Deputy General Director on Scientific Work, e-mail:
Chernykh I. N., Scientific Researcher, e-mail:


Longitudinal mandrel rolling of seamless tubes is conducted in the stands with grooved rolls. So-called “classic” roll pass design (with oval or round reduction area and radial or straight groove flank) is used for tube rolling in the modern mills. Pass shape and deformation procedure have eff ect on precision of tube wall thickness in its cross section and on origination and transformation of surface defects. Deformation of tube shape in the cross section perimeter of deformation area in a single stand occurs in equal conditions. Longitudinal rolling of lead billets on floating mandrel has been conducted using experimental unit. Artificial defects of cylindric form have been applied on surface of the billets, and these billets have been rolled in two passes. Different combinations of roll pass designs have been used; deformation procedures (elongation coefficients), typical for roughing stands of modern tube rolling mills have been applied. The scheme for processing of experimental data has been
proposed and deformation non-uniformity, variation of wall thickness along the line of pass split and relative wall thickness deviation were examined. The relationship between wall thickness variation along pass split line was obtained. Transformation of defects (variation of square, length and orientation of defects relating to the rolling line) in the areas along the perimeter of deformation area were researched. It was shown that actual elongation coeffi cient in the pass and deformation procedures in the concrete deformation area are the determining factors for transformation of defects, independently to pass kind. Relation between reduction in deformation area has also the effect on transformation of defects in the out-of-contact area and on variation of wall thickness along split line.

keywords Longitudinal rolling, mandrel, pass kind, deformation area, pass systems, transformation of defects, precision of geometric parameters

1. Vatkin Ya. L., Shevchenko A. A., Gulyaev G. I. et al. Investigation of pipe deformation during round pass rolling on moving rod. Metal forming : collection of scientific proceedings. Moscow : Metallurgiya, 1967. pp. 169–177.
2. Li Sheng-Zhi, Xu Jie, Yin Yuan, Xue Jian-Guo, Feng Yuan. Mechanism of internal crack formation of seamless modified 9Cr-1 Mo steel tube rolled by mandrel mill and its application. Proceedings of Sino-Swedish Structural Materials Symposium. 2007. pp. 273–276.
3. Kent Li Z., Panzeri M., Hvostal M., Corona F., Kuhn E. Developing and Manufacturing Larger Diameter P110 Seamless Tube at TMK-IPSCO. Iron & Steel Technology. August 2016. pp. 115–125.
4. Ostrenko V. Ya., Brodskiy I. I., Donets V. V. Investigation and improvement of roll pass design in lengthwise rolling mills. Dnepropetrovsk, 1979. 20 p.
5. Struin D. O., Chernykh I. N. Experimental investigations of roll pass design in lengthwise mandrel rolling mills. Materials of the 65-th scientific conference “Science of South Ural State University”. Section of technical sciences. Chelyabinsk : «Izdatelskiy tsentr YuurGU», 2013. Vol. 2. pp. 15–18.
6. Baines K. Lead as a model material to simulate mandrel rolling of hot steel tube. Journal of Materials Processing Technology. 2001. Vol. 118. pp. 422–428.
7. Pyshmintsev I. Yu., Vydrin A. V., Barichko B. V. et al. Creation of equipment complex for investigation and modeling of pipe deformation processes. Proceedings of the XVII International scientific-technical conference “Pipes-2009”. Chelyabinsk : OAO «RosNITI», 2009. pp. 328–331.
8. Sobkowiak P. Experimental investigation on the states of strain and stress occurring in the metal during the continuous tube-rolling process. Journal of Materials Processing Technology. 1996. Vol. 61. pp. 347–353.
9. Livshits D. A., Pyshmintsev I. Yu., Vydrin A. V., Struin D. O., Chernykh I. N. et al. Pipe-rolling mill gauge. Patent PU 2530591 C 2. Published: 10.10.2014. Bulletin No. 25.
10. Lube I. I. Investigation and improvement of technology of hot rolling of pipes made of continuous-cast billet on continuous mill aggregates: thesis of inauguration of Dissertation … of Candidate of Engineering Sciences. Moscow, 2010. 21 p.
11. Struin D. O. About defi nition of geometry parameters during pipe rolling in three-roll passes. Materials of the III Scientific Conference of Post-Graduate and Doctoral Students. Technical sciences. Chelyabinsk : «Izdatelskiy tsentr YuurGU», 2011. Vol. 2. pp. 72–81.
12. Zilberg Yu. V. Metal forming theory : monograph. Dnepropetrovsk: Porogi, 2009. 434 p.

Language of full-text russian
Full content Buy